TM 5-4310-335-14
Section IV. TROUBLESHOOTING
4-7. General
a. This section contains troubleshooting information for locating and correcting most of the operating troubles
which may develop in the air compressor. Each malfunction for an individual component, unit, or system is
followed by a list of tests or inspections which will help to determine probable causes and corrective action to
be taken. Perform the tests/inspections and corrective in 'the order listed.
b. This manual cannot list all malfunctions that may occur, nor all tests or inspections and corrective actions.
If a malfunction is not listed or is not corrected by listed corrective action, see your supervisor.
4-8. Organizational Maintenance Troubleshooting
Refer to table 4-2 for Troubleshooting pertaining to Organizational Maintenance.
Table 4-2. TROUBLESHOOTING
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
1. ENGINE FAILS TO START
Step 1. Check to see If there is fuel in tank.
If fuel tank is empty, refill tank. If engine still fails to start, go to, step 2.
Step 2. Check the service indicator first. If it shows in the red then remove air cleaner element. If
engine starts, air cleaner needs servicing. If engine still falls to start, go to Step 3.
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
F
(38 ) - 138 (590C).
C
F
Service the air cleaner as follows:
a.
Replace or clean element when restrictive indicator changes to "Red."
b.
Loosen the two retaining bolts connecting air cleaner cover to the body.
c.
Remove cover and element from body.
d.
To clean filter element, blow from clean to dirty side or wash in detergent and
water.
e.
Do not use gasoline or other detergent.
f.
Use care when cleaning filter. Do not puncture filter.
g.
Turn wing bolts one quarter turn to tighten. Do not use wrench.
NOTE
Do not wash element in a cleaning solvent.
h.
Reinstall element and tighten retaining bolts .
Step 3. Inspect Ignition system. The order of inspection is as follows:
a. Inspect spark plugs cables for stripped threads, damaged insulation or short. Replace a
damaged spark plug cable.
b. Clean spark plugs for insecure insulation, carbon build-up or cracked porcelain. Clean
spark plug and set gap to 0.030 in. plus or minus 0.002 in. Replace a damaged spark plus.
test the switch.
Disconnect the two wires to the switch. Place switch in the "ON" position and attach test light clips
to the contacts on switch. If a switch lights, switch is good. Replace a defective switch.
Breaker point assembly adjustment.
a. Remove breaker point cover assembly.
b. Adjustment of the breaker points Is as follows:
(1) Rotate engine flywheel until the cam follower of the lower contact assembly is positioned on the
highest point of the ignition cam.
(2) Measure the point gap with a feeler gage. The proper gap is 0.018. If gap is more or less than
0.018 adjustment Is necessary.
(3) Loosen the screw (2) that secure the stationary plate and move the stationary plate until the
desired 0.018 inch gap is reached.
(4) Tighten screws. reverse gap and adjust if necessary.
(5) Rotate the engine flywheel to turn the ignition ram 180and adjust the upper contact assembly
in a similar manner.
c. Ignition timing instructions are a follows:
4-3
