Parts of a Diesel Engine

1. Stationary Parts of
a Diesel Engine
LISAN TAHA AÇIN
YTU MARINE ENGINEERING
Part 1 Diesel Generator

2. Stationary Parts
PURPOSE:
- to support running parts
- to keep them in position and line
- to provide jackets and passages for cooling water, sumps, for lube oil
- to form protective casing for running parts
- to support auxiliaries (valves, camshaft, turbo blowers

3. Stationary Parts
Bedplate
A-Frame or column
Engine or cylinder block
Cylinder liners
Cylinder head or cover
Guides
Stuffing box
Tie Rod

4. Bed Plate
 Support the weight of the rest of the engine, and maintain the
crankshaft, which sits in the bearing housings in the transverse
girders, in alignment.
 At the same time it must be flexible enough to hog and sag
with the foundation plate to which it is attached and which
forms part of the ships structure.
 If the bedplate was too rigid, then as the hull flexed, the holding
down bolts, which secure the engine into the ship would be likely
to break, and there would be a danger of the bedplate cracking

5.  load-carrying part of an engine
 It may include parts as the cylinder block,base, sump and end plates
 In two-stroke engines, frames are sometimes known as A-frames
 A-frame carry the crosshead guides and support the engine entablature
A-Frame

6. Cylinder Block
 The cylinder block is generally a single unit made from cast iron.
 In a liquid-cooled diesel,the block also provides the structure and rigid frame
for the engine’s cylinders,water coolant and oil passages, and support for the
crankshaft and camshaft bearings.

7. Cylinder Liner
 A cylinder liner is a cylindrical part to be fitted into an engine block to form a
cylinder. It is one of the most important functional parts to make up the interior
of an engine.
 Two types liners ;
 A wet liner cylinder walls that are entirely removable, which fit into the cylinder
my means of gaskets. They are called wet liners as their outer surface come in
direct contact with the engine coolant. i.e here the liner is the entire wall not just
a sleeve.
Dry liner designs use either the block's material or a separate liner inserted into
the block to form the backbone of the cylinder wall. Additional sleeves are
inserted within, thus dry on their outer surface.

8. Cylinder Cover
• The cylinder head is fixed onto the cylinder block through the use of big bolts
which are sufficient to withstand the various forces. They also help to transfer
to gas forces acting on the cylinder head to the bedplate via the cylinder
block and ultimately are passed on to the hull of the ship.
• The space at the combustion chamber top is formed and sealed by a cylinder
head.
• The cylinder head of a four-stroke engine houses intake and exhaust valves,
the fuel injection valve, air starting vale, safety valve.

9. Guides
 By taking the longitudinal gas forces on its body which is
coming from the piston reduces the liner wearing.

10. Stuffing Box
 The unique feature of a slow speed two stroke engine is the sealing between the
dirty combustion part and the clean crankcase. The heart of this division is the
piston rod stuffing box.
 The combination of scraper and sealing rings and lamella scraper rings solves
three vital tasks:
 Impurities from the scavenging air space are prevented from entering the crank
case housing.
 A pressure-tight seal is created between the scavenging air space and the crank
case.
 System oil waste is reduced to a minimum.

11. References
 Prof.Dr.Adnan Parlak