CHAPTER 5. GENERAL MAINTENANCE INSTRUCTIONS

TM 10-4320-202-15

CHAPTER 5

GENERAL MAINTENANCE INSTRUCTIONS

Section I. SPECIAL TOOLS AND EQUIPMENT

5-3. Specially Designed Tools and

5-1. Special Tools and Equipment

Equipment

No special tools or equipment are required to

perform direct and general support and depot

No specially designed tools and equipment

maintenance on the pumping assembly.

are required to perform direct and general

support and depot maintenance on the pump-

5-2. Field and Depot Maintenance

ing assembly.

Repair Parts

Field and depot maintenance repair parts list

is not part of this manual.

Section Il. TROUBLESHOOTING

Possible remedy

Probable cause

5-4. General

Replace crankcase (para

Cylinder wall worn or

scored.

8-14) .

This section provides information useful in

Replace damaged oil

Oil pump not operating

diagnosing and correcting unsatisfactory oper-

pump parts (para 6-6).

effectively.

ation or failure of the pumping assembly or

Replace damaged bearings

Main or connecting rod

any of its components. Each trouble symptom

(para 6-10).

bearings faulty.

stated is followed by a list of probable causes

of trouble. The possible remedy recommended

is described opposite the probable cause.

5-7. Knock in Engine

Possible remedy

Probable cause

5-5. Engine Fails to Start

Overhaul engine.

Loose or burned out

Possible remedy

connecting rod bearing.

Probable cause

Repair or replace valves

Valves or valve seat de-

Loose or worn piston pin _ _ _ Replace piston, piston pin

or valve seat (para 6-4

fective.

and connecting rod as

or 6-14).

necessary (para 6-8).

Magneto defective _ _ _ _ _ Overhaul or replace mag-

neto (pare 6-2).

Compression weak _ _ _ _ Replace piston rings (para

5-8. Engine Smokes Excessively

6-8).

Possible remedy

Probable cause

Piston or rings worn or

Replace piston or rings

5-6. Excessive Oil Consumption

(para 6-8).

damaged.

Possilde remedy

Probable cause

Replace crankcase (para 6-

Cylinder walls scored or

Replace piston rings

Piston rings worn or

10).

Worn.

(para 6-8).

broken.

5-1