TM 5-4310-335-14
Table 5-1. TROUBLESHOOTING (Continued)
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
NOTE
Eliminate surging or poor speed regulation by adjusting the idle adjustment needle
on the carburetor.
Connect Ignition switch leads. Install the flywheel cover. Install the spark plug.
Install the rocker arm cover using a new gasket. Install the side cylinder covers.
Step 2. Camshaft gear worn.
Remove the camshaft. Remove plug and rubber seal ring. Use one of the oil pan retaining screws and screw it
finger tight into the threaded hole in the camshaft axle. Use a pair of pliers and pull out the camshaft axle.
Remove retaining ring from the axle.
NOTE
The purpose of the retaining ring is to keep the axle from going too far into the
camshaft.
Remove the camshaft from the engine. Remove the valve tappets from the
engine.
WARNING
Dry cleaning solvent, P-D-680 or P-S-661, used to clean parts is potentially
dangerous to personnel and property. Avoid repeated and prolonged skin
contact. Do not use near open flame or excessive heat. Flash point of
solvent is 100 (39 ) - 138 (59 ).
F
C
F
C
Inspect parts for defects, damage, cracks, breaks, deterioration, .warp, and dents.
Remove carbon deposits, grease, or material or gum. Remove any burrs or nicks.
Clean parts with dry cleaning solvent P.D.680. Install the camshaft and valve
tappets into the engine. Install a new rubber seal ring before replacing the machine
plug. Make a cheek of the cylinder head and valves before replacing. Install the
cylinder head, pushrod and pushrod housing onto the engine. Install new head
gaskets and parking. Install the breather line to air cleaner and cylinder head.
Install the manifold-muffler. Install the intake manifold. Install the carburetor and
throttle controls.
Adjust the carburetor as follows:
a. With engine stopped turn main adjustment needle and idle adjustment needle fully clockwise to close
b. Turn main adjustment needle three-quarters of a turn counterclockwise, and idle adjustment needle
one-half turn counterclockwise. Start engine and run until warm.
misfires or seems low in power, open main exhaust needle. Adjust main adjustment needle until
engine delivers maximum power with minimum of exhaust smoke.
d. If engine application has a throttled speed adjustment, regulator idle mixture in a similar manner.
e. Regulate engine idle RPM by turning idle speed regulating screw clockwise or counterclockwise.
Adjust the governor as follows:
. Remove the front throttle housing cover and gasket.
b. Open clevis and disconnect it from the throttle lever.
c
Hold the throttle 1/16 Inch from the open position.
d
Loosen the locknut below the clevis and screw the clevis up or down until the clevis pin aligns with the
hole in the throttle lever.
e. Connect the clevis to the throttle lever and tighten locknut.
f. To regulate engine speed, turn nut on control rod assembly clockwise to increase or counterclockwise to
decrease engine speed.
NOTE
Eliminate surging or poor speed regulation by adjusting the idle adjustment needle
on the carburetor.
Connect ignition switch leads. Install the flywheel cover. Install the spark plug.
Install the rocker arm cover using a new gasket. Install the side cylinder covers.
4. LOW FLOW OR LONG FILL TIME (COMPRESSOR)
a. Check oil lever with dipstick and bring oil level up to operating level
b. Cheek for insufficient ambient cooling air and operate unit under prescribed condition.
c. Check for bent fins on the intercoolers and straighten all bent fins.
Clean a clogged inlet port
Step 3. Check for leaky fittings, intercooler connections, valves, or any external air leakage. Inspect
the entire unit for loose connections.
Tighten all fittings and connections. If the leak persists then replace the fitting, connection or
valves.
5-6
