TM 10-4320-310-14
5-10.
INSPECT/REPLACE CYLINDER HEAD AND VALVE ASSEMBLY (Continued)
INSTALLATION/ADJUSTMENT:
Too small a clearance will damage piston,
cylinder head, and valves. Too large a
clearance will result in difficult starting.
1
Adjust cylinder head clearance.
a.
Install spacers on one long cylinder head stud
and one short cylinder head stud. Secure with
two hexagon nuts and tighten to hold down
cylinder.
b.
Bring the piston to TDC position.
c.
Measure the distance between the top of the
cylinder and the top of the piston with a
measuring device. Subtract measurement from
required
clearance
of
0.0217/0.0256
inch
(0.55/0.65 mm). The difference is the thickness
of the gasket required for proper cylinder head
clearance.
NOTE
Gaskets come in various thicknesses. If you
have a choice between two gaskets, it is best
to use the thickest one.
d.
Remove the two hexagon nuts and spacers.
2
Apply a light coating of grease to both sides of the
new cylinder head gasket. Install new cylinder head
gasket on cylinder head studs. Align cylinder head
gasket to prevent contact with piston.
3
Adjust complete pushrod (2) so dimension A equals
5.8189/5.8268 inches (147.8/148.0 mm). Loosen
lower locking nut (7), turn upper adjusting nut (8) to
achieve adjustment and tighten lower locking nut to
maintain proper adjustment. This adjustment is
required for proper engagement of complete pushrod
with pinion on decompression shaft.
4
Install new preformed packings (4), shims (5),
pressure springs (6) and protection tubes (3) in
engine crankcase.
5
Install complete pushrod (2) closest to injection pump
side of engine.
6
Install pushrod (1) in engine crankcase on fuel lift
pump side.
5-22
