TM 5-3805-281-24-2
Cylinder Block, Liners, Pistons, and Rods
PRELIMINARY LINER, PISTON, AND ROD CHECKS
Improper periodic service.
SCUFFED OR SCORED PISTONS:
Poor operating conditions.
Coolant leakage into crankcase.
Overheating.
Excessive cylinder liner taper.
Overfueling.
Insufficient lubrication.
CYLINDER LINER WEAR AND DISTORTION:
Insufficient cooling.
Improper piston-to-liner clearance.
Incorrectly installed compression rings.
Coolant leakage into crankcase.
Insufficient lubrication.
Misaligned or bent connecting rod.
Uneven cooling around liner.
Improperly installed piston.
Inadequate piston-to-liner clearance.
Low oil level.
Liner bore damage.
Improper operation.
Incorrect connecting rod bearing clearance.
WARPED CYLINDER BLOCK:
Carbon build-up in ring groove.
Improper engine break-in.
Insufficient cooling.
Worn piston.
Contaminated oil.
BROKEN CONNECTING ROD:
Distorted cylinder liner.
Plugged piston cooling orifice.
Inadequate piston-to-liner clearance.
Ingestion of dust through air intake.
Worn connecting rod bearing.
Distorted cylinder line.
WORN OR BROKEN COMPRESSION RINGS:
Piston pin failure.
Insufficient lubrication.
PISTON PIN AND SNAP RING FAILURE:
Insufficient cooling.
Improper ring installation.
Misaligned connecting rod.
Improper timing.
Excessive crankshaft end play.
Abrasives in combustion chamber.
Incorrect snap rings.
CLOGGED OIL CONTROL RING:
MOTTLED, GRAYISH OR PITTED COMPRESSION
RINGS:
Improper oil.
Excessive blow-by.
Internal coolant leaks.
Contaminated oil.
Improper periodic service.
DULL SATIN FINISH AND FINE VERTICAL
Low operating temperature.
SCRATCHES ON RINGS:
STUCK RINGS:
Dirt and abrasives in air intake system.
Improper oil classification.
RG,RG34710,1112
1923OCT971/1