TM 5-3895-342-12
Table 4-2. Troubleshooting
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
1. STARTING MOTOR WILL NOT START MOTOR
Step 1. Check to see if batteries are discharged or defective.
If discharged or defective replace batteries (para 4-21).
Step 2. Inspect ignition switch and ignition switch wiring to see if either is defective.
If defective, replace ignition switch and wiring (para 4-40).
Step 3. Inspect to see if start switch or wiring is defective.
If start switch is defective replace (para 4-41).
Step 4. Inspect for defective starting motor.
If defective replace starting motor (para 4-23).
2. ENGINE FAILS TO START
Step 1. Check to see if engine is out of time.
If out of time, adjust timing (para 4-24).
Step 2. Check to see if spark plug point gap is wrong.
Remove spark plugs (para 4-25) and adjust gap to .030 inch.
Step 3. Check magneto contact points to see if they are defective or out of adjustment.
Adjust contact points or replace points if defective (para 4-24).
Step 4. Inspect magneto condenser to see if it is shorted.
Test magneto condenser and replace if defective (para 4-24).
Step 5. Inspect for poor compression.
Adjust valve tappets (para 4-14).
3. ENGINE STOPS
Step 1. Inspect magneto condenser to see if it is shorted.
Test magneto condenser and replace if defective (para 4-24).
4. ENGINE OVERHEATS
Step 1. Check to see if timing is incorrect.
If timing is incorrect, time magneto to engine (para 4-24).
Step 2. Inspect to see that air flow through cylinder air shrouds are not obstructed.
Clean air shrouds and inspect for excessive damaged. Replace damaged shroud com-
ponents as necessary (para 4-19).
Step 3. Inspect for back pressure in exhaust line.
If muffler is defective replace muffler (para 4-11).
5. EXCESSIVE FUEL CONSUMPTION
Step 1. Inspect carburetor to see if it is out of adjustment.
If carburetor is out of adjustment, adjust carburetor (para 4-30).
Step 2. Inspect carburetor to see if float sticks.
If float sticks, replace carburetor (para 4-30).
Step 3. Check timing to see if it is incorrect.
If timing is incorrect. time magneto to engine (para 4-24).
6. LOW OIL PRESSURE
Step 1. Inspect oil pressure gage to see if it is defective.
If defective, replace gage (para 4-43).
7. PUMP FAILS TO OPERATE
Step 1. Check to see if pump speed is too low.
If speed is too low. check for broken belt or belt out of adjustment. Replace or adjust
pump bolt (para 4-49).
8. PUMP HAS, INSUFFICIENT CAPACITY
Step 1. Check to see if speed is too low.
If speed is too low. Check for belt out of adjustment (para 4-49).
Change 1 4-5
