AJP PR4, Руководство по обслуживанию

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Chapter 8 – Cylinder and Piston
Service Manual AJP PR3/PR4 8 - 2
TROUBLESHOOTING
Low compression, difficulty in starting or
inappropriate performance at low revs:
 Piston rings worn, broken or seized;
 Cylinder and / or piston worn or damaged.
 Valves
o
Wrong valve clearance
o
Burnt or warped valves
o
Wrong valve timing
o
Valve spring broken
o
Irregular valve seat
o
Warped vale in open position
 Cylinder head
o
Leakage in the cylinder head gasket
o
Nut of cylinder / cylinder head studs
incorrectly tight
o
Warped contact surface
o
Incorrect tight of spark plug
Very high compression, overheating or
pre-detonation:
 Excess carbon deposits on the piston head
or on the combustion chamber;
 Rectified cylinder head or changed
combustion chamber profile
Smoke excess from the exhaust:
 Valve seals are damaged;
 Improper installation of piston rings;
 Piston or cylinder rings worn or seized;
 Damaged valve stem sealing.
Abnormal noise:
 Wrong valve clearance
 Excessive rocker arms or rocker arm shaft
wear
 Worn camshaft or worn camshaft bearings
or bushings
 Piston pin seized or the hole of the piston
pin is wear out
 Piston rod seized
 Worn timing chain
 Worn camshaft timing gear
 Worn valve stem end contact with rocker
arm
 Worn valve or broken valve spring
 Worn valve seat
 Cylinder, piston and piston rings worn /
seized.
Smoke out the breathing tube in the
engine crankcase:
 Piston / segments or cylinder wall
damaged.