TM 5-3895-346-14
CYLINDER LINER
ENGINE OVERHAUL
CYLINDER LINER
The cylinder liner (Fig. 1) is of the replaceable wet type, made of hardened alloy cast iron, and is a slip fit in
the cylinder block. The liner is inserted in the cylinder bore from the top of the cylinder block. The flange at the
top of the liner rests on a counterbore in the top of the block.
A synthetic rubber seal ring, recessed in the cylinder block bore, is used between the liner and the block to
prevent water leakage into the air box.
The upper portion of the liner is directly cooled by water surrounding the liner. The center portion of the liner is
air cooled by the scavenging air which enters the cylinder through equally spaced ports. However, regardless
of the type of cooling, the current cylinder liner is applicable to all engines.
The air inlet ports in the liner are machined at an angle to create a uniform swirling motion to the air as it enters
the cylinder. This motion persists throughout the compression stroke and facilitates scavenging and combust
ion.
The wear on a liner and piston is directly related to the amount of abrasive dust and dirt introduced into the
engine combustion chamber through the air intake. This dust, combined with lubricating oil on the cylinder wall,
forms a lapping compound and will result in rapid wear. Therefore, to avoid pulling contaminated air into the
cylinder, the air cleaners must be serviced regularly according to the surroundings in which the engine is
operating.
Remove Cylinder Liner
It is very important that the proper method is followed when removing a cylinder liner. DO NOT attempt to
push the liner out by inserting a bar in the liner ports and rotating the crankshaft, otherwise the piston may be
damaged or the upper ring groove may collapse.
To remove a cylinder liner, refer to Fig. 2 and proceed as follows:
1. Remove the piston and connecting rod assembly as outlined in Piston and Piston Rings.
2. Remove the cylinder liner with tool set J 22490 as follows:
a. Slip the lower puller clamp up on the puller rod and off the tapered seat. Cock the clamp so it
will slide down through the liner. The clamp will drop back on the tapered seat after it clears
the bottom of the liner. Then slide the upper puller clamp down against the top edge of the
liner.
b. With the tool in place, strike a sharp blow on the upset head on the
Figure 1. Cylinder Liner
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