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Direct and General Support Maintenance Instructions.
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TM-55-4920-341-14 Test Stand Hydraulic System Gasoline Engine Driven Model D - 5B Manual
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Generator and starter
SECTION III (Con't.)
GENERAL
Inspect- 50 100
ion
hour hour
Cylinder heads, manifold, and muffler. Inspect
X
X
X
the cylinder heads, manifolds and muffler for
leaks; loose mounting and defective gaskets.
Tighten loose manifolds and muffler mounting bolts
and nuts.  During the first weekly servicing of a
new or reconditioned engine, inspect all the
cylinder head bolts for tightness.  After warm-
ing engine up to operating temperature, tighten
any loose bolts to 25 to 32 ft-lb torque.  Replace
defective cylinder head and manifold gaskets.
Valve mechanism. If the valves are noisy or loss
X
X
X
of power is noticed, inspect the condition of the
valve mechanism.
Remove valves covers and adjust valve lifter
X
X
clearance if necessary.  The correct clearance
for the valve lifters is 0.0080 inch for the
intake valves and 0.0160 inch for the exhaust
valves.  Replace cover gaskets if defective.
X
Compression Test. Remove the spark plugs and
X
test the cylinder compression by turning the eng-
ine over several times to stabilize gage reading.
If the gage reading varies more than 10 pounds
between the four cylinders, inspect the cylinder
head bolts for tightness.
Tighten any loose bolts and retest.  If low com-
X
pression or a variation in compression persists,
the trouble lies with the cylinder head gasket,
valves, or piston rings.  Correct all deficienc-
ies.
Electrical system magneto. Inspect the ignition
X
X
X
magneto for loose mounting bolts and wiring
connections. Correct any deficiencies noted.
Remove the end cap and inspect the distributor
X
X
cap for cracks, and corroded terminals. Examine
the breaker point gap. The correct gap is
0.015 inch at full separation of points.
Spark plugs. Inspect the spark plugs for loose-
X
X
X
ness, bad connections, and dirty or broken
Replace damaged spark plugs. Clean dirty plugs
X
X
and set the gap to 0.0300 inch.
-49-

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