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 or major overhaul work on the

personnel performing major overhaul work on the

centrifugal pump.

Section II. TROUBLESHOOTING

5-3. General

5-6. High Engine Oil Consumption

This section provides information useful in diagnosing

Probable cause

Possible remedy

and correcting unsatisfactory operation or failure of the

pumping assembly or any of its components. Each

Worn or broken piston

Replace rings (fig. 7-76).

trouble symptom stated is followed by a list of probable

rings.

causes. The possible remedy recommended is

Worn pistons and sleeves

Replace pistons and

described opposite the probable cause.

sleeves (fig. 7-26).

Worn bearings............................... Replace bearings (para

5-4. Poor Engine Compression

7-55).

5-7. Engine Knocks or Develops Excessive Noise

Probable cause

Possible remedy

Valves holding open-no

Adjust valves (para 3-36).

Probable Cause

Possible remedy

tappet clearance.

Worn or burned-out main

Replace bearings (para

Leaky cylinder head

Replace gasket (fig. 7-13).

bearings.

7-55).

gasket.

Worn or burned-out con-

Replace bearings (para

Broken or weak valve

Replace springs (fig.7-13).

necting rod bearings.

7-53).

springs.

Loose piston................................ .. Replace piston (para 7-

Badly worn, broken or

Replace rings (fig. 7-26).

54).

stuck piston rings.

Broken piston ring or

Replace piston or pin para

5-5. Low Engine Oil Pressure

pin.

7-54).

Burned valves and seats................ Replace valves or seats

Probable cause

Possible remedy

(fig. 7-13).

Weak or broken valve

Replace springs (fig.7-13).

Dirt in relief valve or

Clean valve or replace

springs.

broken spring.

spring (fig. 7-13).

Tappet noise................................ .. Adjust valves (para 3-36).

Worn bearings............................... Replace bearings (fig.

Worn camshaft .............................. Replace camshaft (para

7-55).

(7-46).

Worn or damaged oil

Repair or replace oil pump

Misalinement of engine .................. Aline engine (fig. 6-3).

pump gears................................ (para 7-38).

Faulty vibration damper ................. Replace vibration damper

Worn cam bushings....................... Replace bushings (para

(para 7-42).

7-56).

5-1