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Figure 10-9 Differential gear tooth patterns.
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TM-10-3930-630-34 Truck Lift Fork GED Solid Rubber Tired Wheels 4000 lbs Capacity 100 and 180 Inch Lift Manual
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Valves must be installed in the same cylinders from which they were removed.
TM 10-3930-630-34
CHAPTER 11
ENGINE REPAIR INSTRUCTIONS
Section I. CYLINDER HEAD AND VALVES
heavy engine oil through spark plug hold to seal pistons
11-1.  Description
and repeat test.
a. The cylinder head is an alloy cast iron unit
(1) To check piston blow-by, remove engine oil filler
secured to the engine block with special hardened studs
cap. Crank engine, and as the piston is slowly brought
and screws. The head seals the top end of the cylinders
to compression listen at the oil filler tube. If piston is
to form the combustion chambers, and has passages for
allowing air to leak past, it can be heard.
the intake of the air-fuel mixture, and the expulsion of
(2) Mark cylinder for piston repair.
exhaust gases, as well as cored passages through which
the coolant flows to prevent overheating.
11-3.  Valve
Mechanism,
Removal
and
b. The cylinder head as well as the valve tappet
cover must be removed to gain access to the valves
Disassembly
and valve springs. The end of each valve stem is fitted
NOTE
with a shallow steel retainer that surrounds the end of
The
valve
mechanism
is
the valve spring, and is held to the stem by a pair of
disassembled
in
the
removal
wedge keepers or locks.
procedure.
a. Refer to TM 10-3930-630-12 and remove the
11-2.  Cylinder Compression Check
cylinder head.
a. Refer to TM 10-3930-630-12 and remove spark
b. Remove  the  valve  locks,  valve  springs,
plugs and check compression in each cylinder using a
retainers, valves and valve springs as illustrated in
compression tester and gage. Crank engine to check
compression.
TA067440
Figure 11-1. Checking cylinder compression.
b. Note reading on each cylinder.  Pressure of
cylinders must be within 10 psi (0.703 kg/cm2) of each
other.
c. Note cylinders that vary from tolerance. These
cylinders will have to be repaired.
d. If it is suspected that compression may be
Figure 11-2. Values, removed and installation .
leaking past piston rings, inject small amount of
c. After valves are removed, remove tappets (9),
11-1

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