TM 5-3895-346-14
ENGINE OVERHAUL
CYLINDER HEAD
Other conditions which may eventually result in cylinder head cracks are as follows:
1.
Excess fuel in the cylinders caused by leaking injectors.
2.
Slipping fan belts can cause overheating by reducing air flow through the radiator.
3.
Accumulation of dirt on the radiator core which will reduce the flow of air and slow the transfer of
heat from the coolant to the air.
4.
Inoperative radiator cap which will result in loss of coolant.
Remove Cylinder Head
The following service operations on the engine require removal of the cylinder head:
1.
Remove and install pistons.
2.
Remove and install cylinder liners.
3.
Remove and install exhaust valves.
4.
Remove and install exhaust valve guides.
5.
Recondition exhaust valves and valve seat inserts.
6.
Replace fuel injector tubes.
7.
Install new cylinder head gaskets and seals.
8.
Remove and install camshaft.
Due to the various optional and accessory equipment used, only the general steps for removal of the cylinder
head are covered. If the engine is equipped with accessories that affect cylinder head removal, note the
position of each before disconnecting or removing them to ensure correct reinstallation. Then remove the
cylinder head as follows:
1.
Drain the cooling system.
2.
Disconnect the exhaust piping at the exhaust manifold.
3.
Remove the air cleaners or air silencer.
4.
Disconnect the fuel lines at the cylinder head.
5.
Remove the thermostat housing and the thermostat as an assembly.
6.
Clean and remove the valve rocker cover and the governor cover.
7.
Disconnect and remove the fuel rod between the governor and the injector control tube lever.
Remove the fuel rod cover, if used.
8.
Remove the exhaust manifold.
9.
Remove the injector control tube and brackets as an assembly.
10. If the cylinder head is to be disassembled for reconditioning of the exhaust valves and valve seat
inserts or for a complete overhaul, remove the fuel pipes and injectors at this time. Refer to Fuel Injector for
removal of the injectors.
11. Check the torque on the cylinder head bolts before removing the head. Then remove the bolts and
lift the cylinder head from the cylinder block using tool J 22062-01 (Fig. 2). Checking the torque before
removing the head bolts and examining the condition of the compression gaskets and seals after the head is
removed may reveal the causes of any cylinder head problems.
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