CHAPTER 5. GENERAL MAINTENANCE INSTRUCTIONS

CHAPTER 5

GENERAL MAINTENANCE INSTRUCTIONS

Section I. SPECIAL TOOLS AND EQUIPMENT

5-1. Special Tools and Equipment

5-2. Specially Designed Tools and Equipment

No special tools or equipment are required by direct and

No specially designed tools or equipment are required

general support and depot maintenance personnel for

by direct and general support and depot maintenance

performing maintenance on the pumping unit.

personnel for performing maintenance on the pumping

unit.

Section II. TROUBLESHOOTING

5-3. General

This section provides information useful in diagnosing

5-6. Engine Noisy

and correcting unsatisfactory operation or failure of the

Probable Cause

Possible Remedy

centrifugal pump or any of its components. Each

trouble symptom stated is followed by a list of probable

Flywheel loose or defective.. Tighten or replace flywheel

causes.

The possible remedy recommended is

(para 6-17).

described opposite the probable cause.

Main or connecting rod

bearings loose................. Replace bearings (para 6-18).

5-4. Engine Fails to Start or Hard to Start

Probable Cause

Possible Remedy

5-7. Engine Stops Suddenly

Starter fails to crank en-

Probable Cause

Possible Remedy

gine.............................. Check and repair electrical

system and starting motor

Magneto failure ............ Repair magneto (para 3-46).

(para 3-45).

Valves defective ............. Repair or replace valves

5-8. Oil Pressure Low

(para 6-13).

Probable Cause

Possible Remedy

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

Oil pump screen clogged. Clean oil pump screen.

5-5. Engine Misses or Runs Erratically

Oil pump defective .......... Replace oil pump (para 6-15).

Probable Cause

Possible Remedy

Main or connecting rod -.. Replace main bearings (para

6-18).

Replace

Governor defective ......... Repair governor (para 6-2).

connecting rod bearings

Valves burned, warped, or

(para 6-16).

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

5-9. Engine Overheats

(para 6-13).

Probable Cause .............. Possible Remedy

Valve springs weak or bro-

Water pump defective..... Repair water pump (para 6-8).

ken................................ .. Replace valve springs (para

Cylinder head cracked..... Replace cylinder head (para

6-13).

6-12).

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

Crankcase water jacket

inserts and reface intake

cracked ........................... Replace engine block (para 6-

valve seats (para 6-13).

19).

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

5-1