Engine Lacks Power

5-10. Exhaust Smoke Excessive

Probable Cause

Possible Remedy

Probable Cause

Possible Remedy

Starting armature or field

Piston rings and/or pis-

windings defective........... Replace armature or field

tons defective

- Replace piston rings and/or pistons

windings (para 6-4).

(para 6-16).

Commutator worn, burned,

or has high mica.............. Turn down commutator and

5-11. Engine Lacks Power

undercut mica (para 6-4).

Probable Cause

Possible Remedy

Starter shaft and pinion

Governor defective ......... Repair governor (paras 6 2).

defective ......................... Replace shaft and pinion

Valves burned, warped, or

(para 6-4).

broken............................. Repair or replace valves

Starter brush holders de-

(para -13).

fective ............................. Replace

defective brush

Valves springs weak or

holder (para 6-4).

broken............................. Replace valve spring (para 6-

Starter bearing defective. Replace end bells (para 6-4).

13).

Flywheel spur gear defec-

Valve seats cracked ....... Replace exhaust valve seat

tive ................................ .. Replace spur gear (para 6-

inserts and reface intake

1).

valve seats (para 6-13).

Magneto defective........... Repair magneto (para 3 46).

5-14. Pump Fails to Prime

Piston rings and/or pis-

Probable Cause

Possible Remedy

tons defective.................. Replace piston rings and/or

Defective seal ................ Replace seal (para 7-2).

pistons (para 6-16).

Impeller clogged, broken,

or worn out...................... Clean or replace (para 7-2).

5-12. Generator Fails to Function

Check valve not seating

Probable Cause

Possible Remedy

properly........................... Remove dirt or debris from

Generator armature or

check valve seat (para 7-2).

field windings defective ... Replace armature or field

windings (para 63).

5-15. Noisy Pump Operation

Commutator worn, burned,

Probable Cause

Possible Remedy

or has high mica.............. Turn down commutator and

Impeller broken .............. Replace impeller (para 7-2).

undercut mica (para 6-3).

Pump bearings defective. Replace defective bearings

Generator brush holder de-

(para 7-2).

fective ............................. Replace

defective

com-

Pump drive shaft defective Replace drive shaft (para 7-

mutator end frame (para 6-

2).

3).

5-16. Pump Fails to Deliver Rated Capacity

5-13. Starting Motor Does Not Operate Properly

Probable Cause

Possible Remedy

Probable Cause

Possible Remedy

Impeller partially clogged Clean impeller (para 7-2).

Brushes worn.................. Replace brushes.

Section III. RADIO INTERFERENCE SUPPRESSION

components, see paragraph 3-25.

5-17. General

Refer to TM 11-483 for definitions, purposes, source and

methods used to obtain proper radio suppression.

5-19. Replacement of Suppression Components

For replacement of suppression components, see

5-18. Interference Suppression Components

paragraph 3-47b.

For a description of interference suppression

5-2