Kohler aegis lh630 liquid cooled horizontal crankshaft engine service repair manual

AEGIS™
LH630, LH685, LH750, LH760
SERVICE MANUAL
LIQUID-COOLED
HORIZONTAL CRANKSHAFT

Contents
Section 1. Safety and General Information ............................................................................
Section 2. Special Tools ..........................................................................................................
Section 3. Troubleshooting .....................................................................................................
Section 4. Air Cleaner System.................................................................................................
Section 5. Fuel System and Governor ....................................................................................
Section 5B. Electronic Fuel Injection (EFI) Fuel System ......................................................
Section 6. Lubrication System ................................................................................................
Section 7. Cooling System ......................................................................................................
Section 8. Electrical System and Components .....................................................................
Section 9. Disassembly ...........................................................................................................
Section 10. Inspection and Reconditioning ...........................................................................
Section 11. Reassembly...........................................................................................................
4
2
11
10
9
8
7
6
5
3
1
5B

1.1
Section 1
Safety and General Information
1
Section 1
Safety Precautions
To ensure safe operations please read the following statements and understand their meaning. Also
refer to your equipment manufacturer's manual for other important safety information. This manual
contains safety precautions which are explained below. Please read carefully.
WARNING
Warning is used to indicate the presence of a hazard that can cause severe personal injury, death,
or substantial property damage if the warning is ignored.
CAUTION
Caution is used to indicate the presence of a hazard that will or can cause minor personal injury or
property damage if the caution is ignored.
NOTE
Note is used to notify people of installation, operation, or maintenance information that is important
but not hazard-related.
For Your Safety!
These precautions should be followed at all times. Failure to follow these precautions could result in
injury to yourself and others.
LH630, LH685, LH750, LH760
Rotating Parts can cause severe
injury.
Stay away while engine is in
operation.
WARNING
Rotating Parts!
Keep hands, feet, hair, and
clothing away from all moving
parts to prevent injury. Never
operate the engine with covers,
shrouds, or guards removed.
Hot Parts can cause severe burns.
Do not touch engine while operating
or just after stopping.
WARNING
Hot Parts!
Engine components can get
extremely hot from operation. To
prevent severe burns, do not
touch these areas while the
engine is running - or immediately
after it is turned off. Never operate
the engine with heat shields or
guards removed.
Accidental Starts can cause
severe injury or death.
Disconnect and ground spark plug
leads before servicing.
WARNING
Accidental Starts!
Disabling engine. Accidental
starting can cause severe injury
or death. Before working on the
engine or equipment, disable the
engine as follows: 1) Disconnect the
spark plug lead(s). 2) Disconnect
negative (-) battery cable from
battery.

1.2
Section 1
Carbon Monoxide can cause
severe nausea, fainting or death.
Do not operate engine in closed or
confined area.
WARNING WARNING
Electrical Shock can cause injury.
Do not touch wires while engine is
running.
CAUTION
Hot liquid can cause severe burns.
Do not loosen radiator cap while
engine is operating or warm to the
touch.
WARNING
Explosive Gas can cause fires and
severe acid burns.
Charge battery only in a well
ventilated area. Keep sources of
ignition away.
Lethal Exhaust Gases!
Engine exhaust gases contain
poisonous carbon monoxide.
Carbon monoxide is odorless,
colorless, and can cause death if
inhaled. Avoid inhaling exhaust
fumes, and never run the engine
in a closed building or confined
area.
Hot Liquid!
The liquid coolant can get extremely
hot from operation. Turning the
radiator cap when the engine is hot
can allow steam and scalding liquid
to blow out and burn you severely.
Shut off machine. Only remove
radiator cap when cool enough to
touch with bare hands. Slowly
loosen cap to first stop to relieve
pressure before removing
completely.
Explosive Gas!
Batteries produce explosive
hydrogen gas while being
charged. To prevent a fire or
explosion, charge batteries only in
well ventilated areas. Keep
sparks, open flames, and other
sources of ignition away from the
battery at all times. Keep batteries
out of the reach of children.
Remove all jewelry when servicing
batteries.
Before disconnecting the negative
(-) ground cable, make sure all
switches are OFF. If ON, a spark
will occur at the ground cable
terminal which could cause an
explosion if hydrogen gas or
gasoline vapors are present.
Explosive Fuel can cause fires and
severe burns.
Stop engine before filling fuel tank.
WARNING
Explosive Fuel!
Gasoline is extremely flammable
and its vapors can explode if
ignited. Store gasoline only in
approved containers, in well
ventilated, unoccupied buildings,
away from sparks or flames. Do not
fill the fuel tank while the engine is
hot or running, since spilled fuel
could ignite if it comes in contact
with hot parts or sparks from
ignition. Do not start the engine
near spilled fuel. Never use
gasoline as a cleaning agent.
Cleaning Solvents can cause
severe injury or death.
Use only in well ventilated areas
away from ignition sources.
WARNING
Flammable Solvents!
Carburetor cleaners and solvents
are extremely flammable. Keep
sparks, flames, and other sources
of ignition away from the area.
Follow the cleaner manufacturer’s
warnings and instructions on its
proper and safe use. Never use
gasoline as a cleaning agent.
Electrical Shock!
Never touch electrical wires or
components while the engine is
running. They can be sources of
electrical shock.

1.3
Section 1
1
L H 685 SA. Model No.
Liquid Cooled
Horizontal Crankshaft
Numerical Designation
Version Code
S = Electric Start
Figure 1-2. Explanation of Engine Identification Numbers.
Engine Identification Numbers
When ordering parts, or in any communication
involving an engine, always give the Model,
Specification, and Serial Numbers, including letter
suffixes if there are any.
The engine identification numbers appear on a decal,
or decals, affixed to the engine. The primary location is
on the side of the flywheel cover. See Figure 1-1.
Placement may vary due to OEM requirements and
specific options involved. An explanation of these
numbers is shown in Figure 1-2.
Figure 1-1. Engine Identification Decal Location.
B. Spec. No.
Engine Model
Model
LH630
LH685
LH750
LH760
LH685-0001
First spec written
in this model series
31 05810334
Factory Code
C. Serial No.
Year Manufactured Code
Code Year
31 2001
32 2002
33 2003
34 2004
Identification Decal

1.4
Section 1
Oil Recommendations
Using the proper type and weight of oil in the
crankcase is extremely important. So is checking oil
daily and changing oil regularly. Failure to use the
correct oil, or using dirty oil, causes premature engine
wear and failure.
Oil Type
Use high-quality detergent oil of API (American
Petroleum Institute) Service Class SG, SH, SJ or
higher. Select the viscosity based on the air
temperature at the time of operation as shown in the
following table.
NOTE: Using other than service class SG, SH, SJ or
higher oil or extending oil change intervals
longer than recommended can cause engine
damage.
A logo or symbol on oil containers identifies the API
service class and SAE viscosity grade. See Figure 1-3.
*Use of synthetic oil having 5W-20 or 5W-30 rating is
acceptable, up to 4°C (40°F).
**Synthetic oils will provide better starting in extreme cold
below -23°C (-10°F).
Figure 1-3. Oil Container Logo.
Refer to Section 6 - “Lubrication System” for detailed
procedures on checking the oil, changing the oil and
changing the oil filter.
Coolant Recommendations
Use equal parts of ethylene glycol and water only.
Distilled or deionized water is recommended,
especially in areas where the water contains a high
mineral content. Propylene glycol based antifreeze is
not recommended.
This mixture will provide protection from -37°C (-34°F)
to 108°C (226°F). For protection and use outside the
indicated temperature limits, follow the antifreeze
manufacturer's instructions on the container, but do not
exceed 70% antifreeze.
DO NOT use antifreeze with stop-leak additive(s), or
put any other additives in the cooling system.
Fuel Recommendations
WARNING: Explosive Fuel!
Gasoline is extremely flammable and its vapors can
explode if ignited. Store gasoline only in approved
containers, in well ventilated, unoccupied buildings,
away from sparks or flames. Do not fill the fuel tank
while the engine is hot or running, since spilled fuel
could ignite if it comes in contact with hot parts or
sparks from ignition. Do not start the engine near
spilled fuel. Never use gasoline as a cleaning agent.
General Recommendations
Purchase gasoline in small quantities and store in
clean, approved containers. A container with a capacity
of 2 gallons or less with a pouring spout is
recommended. Such a container is easier to handle
and helps eliminate spillage during refueling.
Do not use gasoline left over from the previous
season, to minimize gum deposits in your fuel system
and to ensure easy starting.
Do not add oil to the gasoline.
Do not overfill the fuel tank. Leave room for the fuel to
expand.
*
**

1.5
Section 1
1
Fuel Type
For best results, use only clean, fresh, unleaded
gasoline with a pump sticker octane rating of 87 or
higher. In countries using the Research method, it
should be 90 octane minimum.
Unleaded gasoline is recommended, as it leaves fewer
combustion chamber deposits. Leaded gasoline may
be used in areas where unleaded is not available and
exhaust emissions are not regulated. Be aware,
however, that the cylinder head will require more
frequent service.
Gasoline/Alcohol blends
Gasohol (up to 10% ethyl alcohol, 90% unleaded
gasoline by volume) is approved as a fuel for Kohler
engines. Other gasoline/alcohol blends are not
approved.
Gasoline/Ether blends
Methyl Tertiary Butyl Ether (MTBE) and unleaded
gasoline blends (up to a maximum of 15% MTBE by
volume) are approved as a fuel for Kohler engines.
Other gasoline/ether blends are not approved.
Periodic Maintenance
WARNING: Accidental Starts!
Disabling engine. Accidental starting can cause severe injury or death. Before working on the engine or
equipment, disable the engine as follows: 1) Disconnect the spark plug lead(s). 2) Disconnect negative (-) battery
cable from battery.
Maintenance Schedule
These required maintenance procedures should be performed at the frequency stated in the table.
They should also be included as part of any seasonal tune-up.
1
Perform these maintenance procedures more frequently under extremely dusty, dirty conditions.
Refer to:
Section 5
Section 6
Section 7
Section 4
Section 7
Maintenance RequiredFrequency
• Fill fuel tank.
• Check oil level.
• Check coolant level.
• Check air cleaner for dirty1
, loose, or damaged parts.
• Check the screen, radiator, and cooling areas, clean as
necessary1
.
Daily or Before
Starting Engine
Section 7
Section 5
Section 6
Section 8
• Clean and check cooling areas1
.
• Replace fuel filter.
Every 100 Hours
Annually or
Every 200 Hours
• Change oil and oil filter (more frequently under severe
conditions).
• Check spark plug condition and gap.
Section 4• Replace air cleaner element and check inner element1
.
Annually or
Every 500 Hours
Every 2 Years or
Every 1000 Hours
Section 7
• Replace spark plugs.
Every 250 Hours
Section 8
• Change engine coolant.

1.6
Section 1
Storage
If the engine will be out of service for two months or
more, use the following storage procedure:
1. Clean the exterior surfaces of the radiator and
engine.
2. Change the oil and filter while the engine is still
warm from operation. See “Change Oil and Filter”
in Section 6.
3. The coolant (antifreeze) mixture should be in
good condition and tested to guard against
freezing in cold temperatures. The recommended
equal parts mixture will normally provide
protection down to temperatures of -37°C
(-34°F). If storage temperatures will fall below
this, the cooling system should be drained. A note
should then be attached to the equipment and/or
engine as a reminder to refill the cooling system
before starting.
4. The fuel system must be completely emptied, or
the gasoline must be treated with a stabilizer to
prevent deterioration. If you choose to use a
stabilizer, follow the manufacturer’s
recommendations, and add the correct amount
for the capacity of the fuel system. Fill the fuel
tank with clean, fresh gasoline. Run the engine for
2-3 minutes to get stabilized fuel into the
carburetor. Close fuel shut-off valve when unit is
being stored or transported.
To empty the system, run the engine until the tank
and system are empty.
5. Remove the spark plugs. Add one tablespoon of
engine oil into each spark plug hole. Install plugs,
but do not connect the plug leads. Crank the
engine two or three revolutions.
6. Store the engine in a clean, dry place.

1.7
Section 1
1
Figure 1-4. Typical Engine Dimensions.
Optional Oil Fill
152.08
(5.987)
Oil
Drain
38.00
(1.496)
143.25
(5.640)
175.41
(6.906)
CL Mounting Hole "A"
490.74
(19.320)
Center of Air Intake
583.30
(22.965)
Air Intake Optional Orientation
Engine Mounting Surface 38.00
(1.496)
Oil Drain PlugCL 89.00
(3.504)
Mounting Holes
238.61
(9.394)
431.61
(16.992)
Mounting Hole "A" Mounting Surface
4.00
(.157)
Pilot
CL
CL
155.58
(6.125)
36.50
(1.437)
28.575
(1.125)
Option
112.92
(4.446)
101.60
(4.000)
Option
1/4 Inch Square Key
5/8-18 UNF Thread
7/16-20 Thread Option
120.96
(4.762)
Coolant
Overflow
Fill
39.00
(1.535)
Oil Fill
119.78
(4.716)
673.70
(26.524)
Overall
Fuel Pump
440.00
(17.323)
2X 184.20
(7.252)
127.90
(5.035)
CL Mounting Hole
458.49
(18.051)
Overall
23
(.906) Rain Cap Removal
622.54
(24.509)
Overall without Rain Cap
CL Mounting Hole
Dimensions in millimeters.
Inch equivalents shown in ().
50.99
(2.007)
Mounting Hole "A"
4X 3/8-16 UNC-2B Inch
299.00
(11.77)
Oil Filter
235.19
(9.259)
2X 297.47
(1.711)
Exhaust Ports
177.80 Pilot
(7.000)
Bolt Circle 197.00
(7.756)
15.70 Oil Filter Removal
(.618)
142.88 Bolt Circle
(5.625)
4X 45°
2X 45°
2X 60°
4x 7/16-14 UNC-2B Inch
Oil Filter Side
PTO Side
Top View
Starter Side
Flywheel End

1.8
Section 1
General Specifications1
Power (@ 3600 RPM, corrected to SAE J1995)
LH630 ..............................................................Maximum ............. 16.4 kW (22 HP)
Recommended..... 13.9 kW (18.7 HP)
LH685 ..............................................................Maximum ............. 18.6 kW (25 HP)
LH750 ..............................................................Maximum ............. 20.1 kW (27 HP)
LH760 ..............................................................Maximum ............. 21.6 kW (29 HP)
Peak Torque
LH630 (@ 2200 RPM).................................................................... 48.0 N·m (35.4 ft. lb.)
LH685 (@ 2200 RPM).................................................................... 54.3 N·m (40.1 ft. lb.)
LH750 (@ 2200 RPM).................................................................... 61.0 N·m (45 ft. lb.)
LH760 (@ 2600 RPM).................................................................... 61.7 N·m (45.5 ft. lb.)
Bore
LH630 ............................................................................................ 77 mm (3.03 in.)
LH685 ............................................................................................ 80 mm (3.15 in.)
LH750, LH760 ................................................................................ 83 mm (3.3 in.)
Stroke
LH630, LH685 ................................................................................ 67 mm (2.64 in.)
LH750, LH760 ................................................................................ 69 mm (2.7 in.)
Displacement
LH630 ............................................................................................ 624 cc (38.1 cu. in.)
LH685 ............................................................................................ 674 cc (41.1 cu. in.)
LH750, LH760 ................................................................................ 748 cc (45.6 cu. in.)
Compression Ratio
LH630, LH685 ................................................................................. 8.5:1
LH750, LH760 ................................................................................. 8.7:1
Dry Weight
LH630, LH685, LH750 ................................................................... 51.7 kg (114 lb.)
LH760 ............................................................................................ 52.6 kg (116 lb.)
Oil Capacity (with filter)
LH630, LH685, LH750 ................................................................... 1.9 L (2.0 U.S. qt.)
LH760 ............................................................................................ 2.0 L (2.1 U.S. qt.)
Coolant Capacity (equal parts of water and ethylene glycol) ................. 2.0 L (2.18 U.S. qt.)
Angle of Operation - Maximum (at full oil level) All Directions ............... 20°
Camshaft
End Play (With Shim) ........................................................................... 0.076/0.127 mm (0.0030/0.0050 in.)
Running Clearance ............................................................................... 0.025/0.063 mm (0.0010/0.0025 in.)
1
Values are in Metric units. Values in parentheses are English equivalents. Lubricate threads with engine oil prior
to assembly.
NOTE: All listed dimensions and tolerances are measured at 20°C (68°F).

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1.9
Section 1
1
Camshaft cont.
Bore I.D.
New................................................................................................ 20.000/20.025 mm (0.7874/0.7884 in.)
Max. Wear Limit ............................................................................. 20.038 mm (0.7889 in.)
Camshaft Bearing Surface O.D.
New................................................................................................ 19.962/19.975 mm (0.7859/0.7864 in.)
Carburetor and Intake Manifold
Intake Manifold Fastener Torque (torque in 2 increments) .................... 7.4, 9.9 N·m (66, 88 in. lb.)
Carburetor Mounting Fastener Torque .................................................. 9.9 N·m (88 in. lb.)
Connecting Rod
Cap Fastener Torque (torque in increments) ........................................ 11.3 N·m (100 in. lb.)
Connecting Rod-to-Crankpin Running Clearance
New................................................................................................ 0.043/0.068 mm (0.0016/0.0026 in.)
Connecting Rod-to-Crankpin Side Clearance ....................................... 0.26/0.63 mm (0.0102/0.0248 in.)
Connecting Rod-to-Piston Pin Running Clearance ............................... 0.015/0.028 mm (0.0006/0.0011 in.)
Piston Pin End I.D.
New................................................................................................ 17.015/17.023 mm (0.6699/0.6702 in.)
Crankcase
Governor Cross Shaft Bore I.D.
New................................................................................................ 8.025/8.075 mm (0.3159/0.3179 in.)
Breather Cover Fastener Torque ........................................................ 10.7 N·m (95 in. lb.) Into new as-cast hole
7.3 N·m (65 in. lb.) Into used hole
Oil Drain Plug Torque............................................................................ 13.6 N·m (120 in. lb.)
Crankshaft
End Play (free)...................................................................................... 0.070/0.590 mm (0.0028/0.0232 in.)
Crankshaft Sleeve Bearing I.D. (crankcase)
New................................................................................................ 40.974/40.987 mm (1.6131/1.6136 in.)
Crankshaft Bore (in closure plate)
New................................................................................................ 40.974/41.000 mm (1.6131/1.6141 in.)
Crankshaft Bore (in closure plate)-to-Crankshaft
Running Clearance - New .............................................................. 0.039/0.087 mm (0.0015/0.0034 in.)

1.10
Section 1
Crankshaft cont.
Main Bearing Journals
O.D. - New ..................................................................................... 40.913/40.935 mm (1.6107/1.6116 in.)
O.D. - Max. Wear Limit .................................................................. 40.84 mm (1.608 in.)
Max. Taper ..................................................................................... 0.022 mm (0.0009 in.)
Max. Out-of-Round ........................................................................ 0.025 mm (0.0010 in.)
Crankshaft to Sleeve Bearing (crankcase)
Running Clearance - New .............................................................. 0.039/0.0074 mm (0.0015/0.0029 in.)
Connecting Rod Journal
O.D. - New ..................................................................................... 35.955/35.973 mm (1.4156/1.4163 in.)
O.D. - Max. Wear Limit .................................................................. 35.94 mm (1.415 in.)
Max. Taper ..................................................................................... 0.018 mm (0.0007 in.)
Crankshaft T.I.R.
PTO End, Crank in Engine ............................................................. 0.15 mm (0.0059 in.)
Entire Crank, in V-Blocks ............................................................... 0.10 mm (0.0039 in.)
Cylinder Bore
Cylinder Bore I.D.
New
LH630 ...................................................................................... 77.000/77.025 mm (3.0315/3.0325 in.)
LH685 ...................................................................................... 80.000/80.025 mm (3.1496/3.1506 in.)
LH750, LH760 ......................................................................... 83.006/83.031 mm (3.2679/3.2689 in.)
Max. Wear Limit
LH630 ...................................................................................... 77.063 mm (3.0340 in.)
LH685 ...................................................................................... 80.065 mm (3.1522 in.)
LH750, LH760 ......................................................................... 83.069 mm (3.2704 in.)
Max. Taper ..................................................................................... 0.05 mm (0.0020 in.)
Cylinder Head
Cylinder Head Fastener Torque (torque in 2 increments)...................... 16.9, 33.9 N·m (150, 300 in. lb.)
Max. Out-of-Flatness ............................................................................ 0.076 mm (0.003 in.)
Rocker Pivot Fastener Torque .............................................................. 11.3 N·m (100 in. lb.)
Electric Starter
Starter Thru Bolt Torque........................................................................ 5.6-9.0 N·m (49-79 in. lb.)
Starter Mounting Screw Torque............................................................. 15.3 N·m (135 in. lb.)
Starter Brush Holder Fastener Torque .................................................. 2.5-3.3 N·m (22-29 in. lb.)
Starter Solenoid Fastener Torque ......................................................... 4.0-6.0 N·m (35-53 in. lb.)
Starter Solenoid Positive (+) Brush Lead Retaining Nut Torque ............ 8.0-11.0 N·m (71-97 in. lb.)

1.11
Section 1
1
Fan/Flywheel
Rear Fan Shaft to Mounting Bracket Nut Torque .................................. 15.8 N·m (140 in. lb.)
Front Fan Assembly to Fan Shaft Nut Toque ........................................ 15.8 N·m (140 in. lb.)
Fan/Pulley/Hub Assembly Fastener Torque .......................................... 6.8 N·m (60 in. lb.)
Flywheel Retaining Screw Torque ......................................................... 66.4 N·m (49 ft. lb.)
Lower Flywheel Cover Mounting Screw Torque .................................... 9.9 N·m (88 in. lb.)
Lower Pulley Mounting Screw Torque ................................................... 24.3 N·m (215 in. lb.)
Governor
Governor Cross Shaft to Crankcase Running Clearance...................... 0.025/0.126 mm (0.0009/0.0049 in.)
Governor Cross Shaft O.D.
New................................................................................................ 7.949/8.000 mm (0.3129/0.3149 in.)
Governor Gear Shaft O.D.
New................................................................................................ 5.990/6.000 mm (0.2358/0.2362 in.)
Governor Gear Shaft-to-Governor Gear Running Clearance ................ 0.090/0.160 mm (0.0035/0.0063 in.)
Ignition
Spark Plug Type (Champion®
or equivalent) ......................................... RC14YC
Spark Plug Gap .................................................................................... 0.76 mm (0.030 in.)
Spark Plug Torque ................................................................................ 24.4-29.8 N·m (18-22 ft. lb.)
Ignition Module Air Gap ........................................................................ 0.2/0.3 mm (0.008/0.012 in.)
Ignition Module Fastener Torque .......................................................... 6.2 N·m (55 in. lb.) Into new as-cast hole
Rectifier-Regulator Fastener Torque ..................................................... 4.0 N·m (35 in. lb.)
Muffler
Muffler Retaining Nuts Torque .............................................................. 24.4 N·m (216 in. lb.)
Oil Filter/Closure Plate
Oil Filter Torque .................................................................................... 10.4-12.7 N·m (90-110 in. lb.)
Closure Plate Fastener Torque ............................................................. 24.4 N·m (216 in. lb.)

1.12
Section 1
²Measure 6 mm (0.236 in.) above the bottom of the piston skirt at right angles to the piston pin.
Piston, Piston Rings, and Piston Pin
Piston-to-Piston Pin .............................................................................. 0.006/0.018 mm (0.0002/0.0007 in.)
Piston Pin Bore I.D.
New................................................................................................ 17.006/17.013 mm (0.6695/0.6698 in.)
Piston Pin O.D.
New................................................................................................ 16.995/17.000 mm (0.6691/0.6693 in.)
Top Compression Ring-to-Groove Side Clearance
LH630 ............................................................................................ 0.040/0.086 mm (0.0016/0.0034 in.)
LH685 ............................................................................................ 0.050/0.096 mm (0.0020/0.0038 in.)
LH750, LH760 ................................................................................ 0.014/0.041 mm (0.0005/0.0016 in.)
Middle Compression Ring-to-Groove Side Clearance
LH630 ............................................................................................ 0.040/0.086 mm (0.0016/0.0034 in.)
LH685 ............................................................................................ 0.030/0.076 mm (0.0012/0.0030 in.)
LH750, LH760 ................................................................................ 0.012/0.039 mm (0.0004/0.0015 in.)
Oil Control Ring-to-Groove Side Clearance
LH630 ............................................................................................ 0.046/0.196 mm (0.0018/0.0077 in.)
LH685 ............................................................................................ 0.046/0.196 mm (0.0018/0.0077 in.)
LH750, LH760 ................................................................................ 0.026/0.176 mm (0.0010/0.0070 in.)
Top and Middle Compression Ring End Gap
LH630
New Bore
Top Ring ............................................................................ 0.180/0.380 mm (0.0071/0.0150 in.)
Middle Ring ....................................................................... 0.250/0.450 mm (0.0098/0.0177 in.)
Used Bore (Max.) .................................................................... 0.77 mm (0.030 in.)
LH685
New Bore
Top Ring ............................................................................ 0.180/0.430 mm (0.0071/0.0169 in.)
Middle Ring ....................................................................... 0.250/0.460 mm (0.0098/0.0181 in.)
Used Bore (Max.) .................................................................... 0.80 mm (0.0315 in.)
LH750, LH760
New Bore................................................................................. 0.250/0.56 mm (0.0098/0.022 in.)
Used Bore ............................................................................... 0.94 mm (0.037 in.)
Piston Thrust Face O.D.²
LH630
New ......................................................................................... 76.967/76.985 mm (3.0302/3.0309 in.)
Max. Wear Limit ...................................................................... 76.840 mm (3.0252 in.)
LH685
New ......................................................................................... 79.963/79.981 mm (3.1481/3.1488 in.)
LH750, LH760
New ......................................................................................... 82.973/82.991 mm (3.2666/3.2673 in.)

1.13
Section 1
1
Piston, Piston Rings, and Piston Pin cont.
Piston Thrust Face-to-Cylinder Bore² Running Clearance
LH630 ............................................................................................ 0.014/0.057 mm (0.0005/0.0022 in.)
LH685 ............................................................................................ 0.019/0.062 mm (0.0007/0.0024 in.)
LH750, LH760 ................................................................................ 0.015/0.058 mm (0.005/0.0022 in.)
Speed Control
Speed Control Bracket Assembly Fastener Torque............................... 10.7 N·m (95 in. lb.) Into new as-cast hole
Stator
Stator Mounting Screw Torque .............................................................. 6.2 N·m (55 in. lb.)
Throttle/Choke Controls
Governor Control Lever Fastener Torque ............................................. 9.9 N·m (88 in. lb.)
Valve Cover/Rocker Arms
Valve Cover Fastener Torque ............................................................... 6.2 N·m (55 in. lb.)
Valves and Valve Lifters
Hydraulic Valve Lifter to Crankcase Running Clearance ....................... 0.0124/0.0501 mm (0.0005/0.0020 in.)
Intake Valve Stem-to-Valve Guide Running Clearance ......................... 0.038/0.076 mm (0.0015/0.0030 in.)
Exhaust Valve Stem-to-Valve Guide Running Clearance ...................... 0.050/0.088 mm (0.0020/0.0035 in.)
Intake Valve Guide I.D.
New................................................................................................ 7.038/7.058 mm (0.2771/0.2779 in.)
Intake Valve Stem Diameter
New................................................................................................ 6.982/7.000 mm (0.2749/0.2756 in.)
Exhaust Valve Guide I.D.
New................................................................................................ 7.038/7.058 mm (0.2771/0.2779 in.)
Exhaust Valve Stem Diameter
New................................................................................................ 6.970/6.988 (0.2744/0.2751 in.)
Valve Guide Reamer Size
Standard......................................................................................... 7.048 mm (0.2775 in.)
0.25 mm O.S. ................................................................................. 7.298 mm (0.2873 in.)
Intake Valve Lift .................................................................................... 8.88 mm (0.3496 in.)
Exhaust Valve Lift ................................................................................. 8.88 mm (0.3496 in.)
Nominal Valve Seat Angle..................................................................... 45°
²Measure 6 mm (0.236 in.) above the bottom of the piston skirt at right angles to the piston pin.

Kohler aegis lh630 liquid cooled horizontal crankshaft engine service repair manual

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Kohler aegis lh630 liquid cooled horizontal crankshaft engine service repair manual