Cylinder Block, Liners, Pistons, and Rods
02
030
53
RG,RG34710,135 –19–30SEP97–1/1
Check Engine Rotation for Excessive
Tightness
1. Rotate crankshaft several revolutions to be sure engine
rotates without excessive tightness.
2. Check liners for deep scratches caused by an
improperly installed or broken piston ring.
3. Check side clearance of rods; must have slight
side-to-side movement.
RG,RG34710,136 –19–01NOV00–1/1
Measure Piston Protrusion
1. Press down on top of piston to remove oil
clearances.
2. Use JDG451 Gauge along with D17526CI (English
scale) or D17527CI (Metric scale) Dial Indicator, or
use KJD10123 Gauge to measure piston protrusion.
Place gauge on top of cylinder block so dial
indicator can be set to “zero” (0.000) with top of
block.
3. Position gauge across top of piston. While pressing
gauge downward, rotate crankshaft until piston is at
“TDC.”
4. Measure and record piston height at several
positions around top OD of piston.
5. Piston protrusion must be within the following
specification to prevent piston-to-exhaust valve
contact.
Specification
Piston (Early Engines)—
Protrusion Above Block Deck 0.229—0.787 mm
(0.009—0.031 in.)
.................................
Piston (RE505901) (Later 12.5
L Engines)—Protrusion Above
Block Deck 0.079—0.637 mm
(0.003—0.025 in.)
..............................................................
6. Repeat procedure on remaining pistons and record
measurements.
If protrusion does not meet specification, check
dimensions of piston, connecting rod, cylinder block,
crankshaft, and bearings to determine the cause.
CTM100 (06APR04)
02-030-53
P
OWER
T
ECH
10.5 L & 12.5 L Diesel Engines
040604
PN=193
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