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Page Title:
Table 4-1. Preventive Maintenance Checks and Services-continued |
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 Malfunction
Probable cause
Corrective action
b. Ignition switch defective.
b. Replace ignition switch (para 4-
c. Overspeed stop.
c. Correct cause of overspeed.
Reset overspeed stop governor
and restart.
d. Shorted or grounded magneto.
d. Replace magneto (para 4-34).
e. Magneto points sticking shut.
e. Replace or adjust magneto points
f. Defective capacitor.
f. Replace capacitor (para 4-34).
3. Engine cranks but fails to start
a. No fuel in tank.
a. Fill tank (para 2-10j).
(good spark).
b. Clogged fuel lines or filter.
b. Clean lines and replace filter
c. Defective fuel pump.
c. Replace fuel pump (para 4-23).
d. Plugged vent in fuel tank cap.
d. Open fuel tank cap vent.
e. Water in fuel.
e. Drain and clean fuel tank, and
replenish fuel supply.
4. Engine runs but continuously mis-
a. Uneven compression (para 4-51).
a. Report to direct support mainte-
fires.
nance.
b.
Spark plug wire defective.
b. Replace wire (para 4-33).
c.
Magneto defective.
c. Replace magneto (para 4-34).
d.
Defective spark plug.
d. Replace spark plug (para 4-33).
5. Engine runs unevenly at idle.
a.
Wide spark plug gap.
a. Regap plugs (para 4-33).
b.
Improper carburetor idle adjust-
b. Adjust carburetor (para 4-24).
ment.
c. Intake air leaks.
c. Correct air leaks.
6. Engine starts, then stops.
a. Water temperature safety switch
a. Refer to section X and determine
trips.
and correct the cause of engine
overheating.
b. Oil pressure safety switch trips.
b. Add oil if necessary (para 4-9).
If oil level is not low, report the
trouble to direct support main-
tenance.
c. Engine overspeed governor trips.
c. Reset governor (para 2-10h) and
restart engine. If engine speed
approaches 2700 rpm, adjust
engine speed governor (para
trips before 2650 rpm, report
to direct support maintenance.
7. Engine lacks power.
a. Timing incorrect.
a. Correct engine timing (para 4-
b. Throttle fails to open fully.
b. Adjust throttle control (para 4-
c. Air leaks in fuel system.
c. Correct air leaks.
d. Air cleaner restricted.
d. Service air cleaner (para 4-18).
e. Poor fuel.
e. Drain fuel tank and replenish
with proper fuel.
8. Engine overheats.
a.
Low coolant level.
a. Fill radiator with correct solution.
b.
Fan belt slipping.
b. Tighten fan belt (para 4-30).
c.
Defective thermostat.
c. Replace thermostat (para 4-29).
d.
Clogged radiator.
d. Replace radiator (para 4-31).
e.
Defective water pump.
e. Replace water pump (para 4-30).
f.
Late ignition timing.
f. Correct engine timing (para 4-
9. High engine oil consumption.
a. Oil leaks.
a. Correct oil leaks,
b. Incorrect grade of oil used.
b. Use oil recommended in lubrica-
tion order.
c. Engine worn.
c. Report to direct support mainte-
nance.
10. Excessive pump vibration.
a. Engine and pump improperly
a. Aline engine and pump (para 4-
alined.
47).
b. Coupling defective.
b. Replace coupling (para 4-48).
c. Pump bearings defective.
c. Replace pump (para 4-47).
11. Pump seized or binding.
Internal pump damage.
Replace pump (para 4-47).
4-6
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