Cylinder Block, Liners, Pistons, and Rods
02
030
22
RG,RG34710,115 –19–01NOV00–1/1
Check Piston Compression Ring Groove
Wear—6105 Engines
RG8373 –UN–21MAY98
Checking 6105 Piston Ring Groove (JDG1019 Shown on RE52836
Piston)
RGR24201 –UN–19NOV97
JDG1019 Ring Groove Wear Gauge Shown
A—Piston with Worn Ring Groove
B—Keystone Ring Groove
C—JDG1019 Ring Groove Wear Gauge
D—Ring Land
E—Gauge Shoulder
F—Piston with Good Ring Groove
NOTE: Earlier engines with RE52836 and RE504801
pistons have 4-mm compression rings. Later
engines with RE504343 pistons have 3-mm
compression rings. Piston part numbers are
marked on top of pistons for identification.
Use the JDG1019 Ring Groove Wear Gauge on RE52836
and RE504801 pistons (early engines) to check wear of
top two compression ring grooves. Use the JDG1335 Ring
Groove Wear Gauge on RE504343 pistons (later engines)
to check wear of top two compression ring grooves.
Check each groove at several locations.
Gauge shoulders should not contact ring land (D) of
piston. If ring grooves are worn, replace piston and liner
as a set. If ring grooves are good, proceed with piston
inspection.
CTM100 (06APR04)
02-030-22
P
OWER
T
ECH
10.5 L & 12.5 L Diesel Engines
040604
PN=162
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