TM 5-3895-346-14
CYLINDER HEAD
ENGINE OVERHAUL
a.
Exhaust valves, valve seat inserts, and springs (Exhaust Valve).
b.
Cam followers, guides, push rods, springs, retainers, rocker arms, shafts, brackets, and other
related parts (Valve Operating Mechanism).
c.
Place new washers on the fuel connectors. Then install the connectors and tighten them to
20-28 lb ft (27-38 Nm) torque.
d.
The fuel injectors, fuel pipes, and injector control tube assembly can be installed at this time
or after the cylinder head is installed on the engine.
Preinstallation Inspection
Make the following inspections just prior to installing the cylinder head, whether the head was removed to
service only the head or to facilitate other repairs to the engine.
1.
Check the cylinder liner flange heights with relationship to the cylinder block (Cylinder Liner).
2.
Make sure the piston crowns are clean and free of foreign material.
3.
Make sure that each push rod is threaded into its clevis until the end of the push rod projects
through the clevis. This is important since serious engine damage will be prevented when the crankshaft is
rotated during engine tune-up.
4.
Check the cylinder block and cylinder head gasket surfaces, counterbores, and seal grooves to be
sure they are clean and free of foreign material. Also check to ensure that there are no burrs or sharp edges in
the counterbores.
5.
Inspect the cylinder head boltholes in the block for accumulation of water, oil, or any foreign
material.
Clean the boltholes thoroughly and check for damaged threads.
Install Cylinder Head
1.
Refer to Fig. 6 and install the water and oil seal rings and compression gaskets as follows:
CAUTION
Never install used compression gaskets
or seals.
a.
Place a new compression gasket on
top of each cylinder liner.
b.
Place new seal rings in the
counterbores of the water and oil holes in the cylinder
block. Silicone composition water hole seals can be
damaged if they move out of position in the cylinder
block counterbore during engine rebuild.
In turn,
damaged seals can allow engine coolant to contaminate
lube oil and cause serious engine damage. To prevent
this, a spray adhesive may be used to hold seals in place if Figure 6. Cylinder Head Gaskets and Seals in
the following precautions are taken: Figure 6. Cylinder
Place on Cylinder Block
Head Gaskets and Seals in Place on Cylinder Block
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