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Wp06 training material flypartsguy.com
1. 1
WP6 Gas Engine
Key point of maintenance and assembly
Aug 2018
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Document Courtesy of Fly Parts Guy Co.
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2. 2
CONTENTS
1. Maintenance
2. Key point of assembly
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3. 3
1.Maintenance—Specification of fuel, lubricating oil and coolant
•Natural Gas: at least 70% methane by volume or have a heating
value of 950-1100 BTUs per standard cubic foot
•LPG: minimum of 90% propane, maximum of 5% propylene, and
maximum 5% of other gases
•Wellhead gas(emergency only, WP06 naturally aspirated only):
have a heating value of 700-2362 BTUs per standard cubic foot
Fuel
•Recommends using a straight weight or multi-weight low ash
content oil specifically formulated for Natural Gas Engines
•Specific weight depends on operating temperatures: (10W-30 : -
25 to 30℃), (15W-40 : -20 to 40℃), (20W-50 : -15 to 45℃)
Oil
•recommends using a 50/50 mixture of fully formulated Ethylene
Glycol or fully formulated Propylene Glycol coolant and distilled
water
Coolant
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6. 6
1.Maintenance—Daily check
1.Check engine oil level
2.Check coolant level
Caution : Never remove radiator
or top tank cap when coolant is
hot!
3. Check operation conditions
❖Check hoses, clamps, pipes for loose
connection or leak.
❖Check connectors for loose connection.
❖Check harness for cut, short, corrosion
or abrasions.
❖Check belt for loose or fraying.
❖Assure battery voltage is ≥12v each.
4. Check oil pressure
Oil Pressure
Idle PSI KPI
Min 19 120
Rated Speed
Min 55 300
Max 84 600
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7. 7
1.Maintenance—Replace lubricating oil and oil filter element
Engine model Oil refill volume Material details
WP06 25L (6.6 Gal) Recheck dipstick 1 filter element and 1 O-ring
Replace oil filter element:
1.Drain oil completely.
2.Remove oil filter cover.
3.Remove oil filter and O-ring.
4.Install new filter and O-ring (apply a thin coat of
motor oil to o- ring before installing)
5.Install filter cover and tighten to 40N.m.
6.Fill new oil and run engine for 5 minutes, check
for leaks.
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8. 8
1.Maintenance—Adjust valve lash
1.The first piston is on the “TDC” of compression stroke
Valve lash (cold)
intake 0.2mm
Exhaust(WP6GTA) 0.4mm
Fan
side
#1@TDC
(COMPRESSION STROKE)
INT EXH INT EXH INT EXH Flywheel
side
1 1 2 3 4 5
2.The number six piston is on the “TDC” of compression stroke
Fan
side
EXH INT EXH INT INT EXH #6@TDC
(COMPRESSION STROKE)
Flywheel
side
2 3 4 5 6 6
TDC mark
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9. 9
CONTENTS
1. Maintenance
2. Key point of assembly
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10. 10
2. Key point of assembly—Gear timing
Rotate the crankshaft until 0 tick on timing gear is closest to camshaft, install
camshaft timing gear, make sure 0 tick of timing gear is engaged with 0 tick of
crankshaft gear.
0 tick of camshaft
timing gear should
be engaged with 0
tick of crankshaft
gear.
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11. 11
2. Key point of assembly—Signal generator
1. Rotate the crankshaft to “OT” mark, make sure the first piston is on the top
dead center of compression stroke.
2. Install the signal generator and adjust angle of the fluted disc until its TDC mark
points at the center of the phase sensor and the predetermined ignition angle is
reached.
3. Tighten the locknut (80～100N·m) on the signal generator fluted disc.
Note: the correct value of the gap between the fluted disc and sensor is 0.8~1.5mm
1th piston@ TDC of
compression stroke
TDC mark points at the
center of phase sensor.
Fluted disc
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12. 12
2. Key point of assembly—Connecting rod and piston
Key points:
1.The connecting rod oblique split and piston cooling oil gallery inlet should be in
the same direction.
2.The connecting rod oblique split and oil cooler should be in the same direction.
3.The torque of connecting rod bolt is :30N·m + (60±4°), (Reach 85 to
135N·m at the same time)
NOTE: 1.The connecting rod bolts can’t be re-used.
2. The opening of piston rings should not overlap.
Face to oil cooler
Oil inlet and the
oblique split should be
in same direction
Adjust the angle of piston
rings to make sure the
opening not overlap.
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13. 13
2. Key point of assembly—Main bearing bolt
Main bearing bolts:
70N·m + (90±4°), required sequence of tightening as below
Note: the oil groove on the thrust plate should face to crankshaft.
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14. 14
2. Key point of assembly—Cylinder head bolts
Cylinder head bolts:
30N·m +2x (120±4°), required sequence of tightening as below, (Reach
230 to 300N.m at the same time)
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15. 15
2. Key point of assembly—Flywheel housing
Flywheel housing bolts:
M10: 80~85N·m, follow the sequence of arrow to tighten
M12: 140~145N·m, required sequence of tightening as below (1-2-3-4-
5-6)
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16. 16
2. Key point of assembly—
Engine Fastener Torque Specifications
Fastener’s Name Bolt Specification
Tightening torque (N·m) + further turned
angle (°)
Permissible times
of repeat used
Main bearing M14-10.9
70N·m + (90±4°), required sequence of
tightening
2
Connecting rod
(machine cut)
M12x1.5-12.9
30N·m + (60±4°), (Reach 85 to 135N·m at
the same time)
0
Connecting rod
(fracture split)
M10
30N·m + (120±5°), (Reach 67 to 107N·m at
the same time)
0
Cylinder head M14-12.9
30N·m +2x (120±4°), required sequence of
tightening (Reach 230 to 300N.m at the same
time)
3
Flywheel M16x1.5 290±5N·m 2
Camshaft gear M8-12.9 55N.m+5N·m 2
Exhaust manifold M10 65~80N·m 2
Intake manifold M10 23N.m -
Crankshaft pulley M16-12.9 300~310N·m -
Damper M10-10.9 65~70N·m -
Rocker seat M10-8.8 40~45N·m -
Spark-plug M14x1.25 (25 to 28) N·m -
UEGO sensor M18x1.5 40N.m±5 N·m -
Water temperature
sensor
M14x1.5 25N.m±5 N·m -
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17. 17
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