Cylinder Block, Liners, Pistons, and Rods
02
030
5
RG,RG34710,1112 –19–06MAY99–1/1
Preliminary Liner, Piston, and Rod Checks
Scuffed or Scored Pistons:
• Overheating.
• Overfueling.
• Insufficient lubrication.
• Insufficient cooling.
• Improper piston-to-liner clearance.
• Coolant leakage into crankcase.
• Misaligned or bent connecting rod.
• Improperly installed piston.
• Low oil level.
• Improper operation.
• Incorrect connecting rod bearing clearance.
• Carbon build-up in ring groove.
• Improper engine break-in.
• Worn piston.
• Contaminated oil.
• Distorted cylinder liner.
• Plugged piston cooling orifice.
• Ingestion of dust through air intake.
Worn or Broken Compression Rings:
• Insufficient lubrication.
• Insufficient cooling.
• Improper ring installation.
• Improper timing.
• Abrasives in combustion chamber.
Clogged Oil Control Ring:
• Improper oil.
• Excessive blow-by.
• Contaminated oil.
• Improper periodic service.
• Low operating temperature.
Stuck Rings:
• Improper oil classification.
• Improper periodic service.
• Poor operating conditions.
• Coolant leakage into crankcase.
• Excessive cylinder liner taper.
Mottled, Grayish or Pitted Compression Rings:
• Internal coolant leaks.
Dull Satin Finish and Fine Vertical Scratches on
Rings:
• Dirt and abrasives in air intake system.
Piston Pin and Snap Ring Failure:
• Misaligned connecting rod.
• Excessive crankshaft end play.
• Incorrect snap rings.
Broken Connecting Rod:
• Inadequate piston-to-liner clearance.
• Worn connecting rod bearing.
• Distorted cylinder liner.
• Piston pin failure.
Cylinder Liner Wear and Distortion:
• Incorrectly installed compression rings.
• Insufficient lubrication.
• Uneven cooling around liner.
• Inadequate piston-to-liner clearance.
• Liner bore damage.
Warped Cylinder Block:
• Insufficient cooling.
CTM100 (06APR04)
02-030-5
P
OWER
T
ECH
10.5 L & 12.5 L Diesel Engines
040604
PN=145
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