Yanmar YM276 Service Manual page 114

CYLINDER BLOCK, LINERS, PISTONS,AND RODS
20.101
DIAGNOSING MALFUNCTIONS
,
Scuffed or Scored Pistons
.
Insufficient lubrication
Insufficient cooling
.
lmproper piston-liner clearance
Preignition or postignition
.
Coolant leakage in crankcase
.
Misaligned or bent connecting rod
Low oil level
.
lrnproper operation
Incorrect connecting rod bearing clearance
Carbon build up in ring groove
.
lmproper break-in
Worn piston
Contaminated oil
.
Distorted cylinder liner
Worn or Broken Compression Rings
.
Insufficient lubrication
lnsufficient cooling
.
lmproper ring installation
.
lmproper combustion
lmproper timing
. - ,
Abrasives in combustion chamber
Clogged Oil Ring
Improper oil
.
Excessive blow-by
.
Contaminated Oil
.
lmproper periodic service
.
LOW operating temperature
Stuck Rings
lmproper oil classification
lmproper periodic service
Poor operating conditions
.
Coolant leakage i n crankcase
Cylinder Liner Wear and Distortion
.
Incorrectly installed compression rings
.
Insufficient lubrication
.
Uneven cooling around liner
.
lmproper piston-liner clearance
.
Liner bore damage
Warped Cylinder Block
lnarfficientcmling
Broken Connecting Rod
Loose connecting rod cap screws
.
Inadequate piston-liner clearance
.
Worn connecting rod bushing
Distorted cylinder liner
.
Piston pin failure
Piston Pin and Snap Ring Failure
.
Misaligned connecting rod
Excessive crankshaft end play
Mottled, Grayish or Pitted Compression Rings
.
Internal coolant leaks
Dull Stain Finish and Fine Vertical Scratches on Rings
Dirt and abrasive in air intake system
SMEZ760171~304
YM276and 276D
Kinornoto. Printed in Jawn