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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.
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
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
Weak or broken valve
Replace springs (fig.7-13).
Dirt in relief valve or
Clean valve or replace
springs.
broken spring.
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
5-1

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