Cylinder Block, Liners, Pistons, and Rods
02
030
25
RG,RG34710,118 –19–13AUG99–1/1
Inspect Piston Pin and Pin Bore in Piston
RG5231 –UN–05DEC97
Installing Piston Pin
RG4984 –UN–05DEC97
Piston Pin Bore Inspection
A—Pin
B—Tapered Bore
C—Opposite Side of Bore
NOTE: Piston pin must be in good condition and not worn
beyond specification given below.
1. Dip piston pin in clean engine oil.
NOTE: On 6125 engines, assemble piston crown and
skirt.
2. Install pin (A) through piston.
Pin should pass through piston using only light thumb
pressure.
3. Check taper in piston pin bore by inserting pin from
both sides. If pin enters freely, but binds in the center,
the bore could be tapered (B).
4. Insert pin in piston to check for bore alignment. Pin
should not “click” or need to be forced into bore on
opposite side (C).
5. Measure piston pin and piston bore and compare to
specifications. If either are not within specification,
replace pin, piston, and liner.
Specification
Piston Pin—OD 50.772—50.787 mm
(1.9989—1.9995 in.)
.........................................................
Piston Pin Bore in Piston
(6105)—ID 50.795—50.805 mm
(1.9998—2.0002 in.)
.................................................................
Piston Skirt Bushing (6125)—ID 50.798—50.808 mm
(1.9999—2.0003 in.)
...............................
Piston Crown Bushing (6125)—ID 50.810—50.825 mm
(2.0004—2.0010 in.)
............................
CTM100 (06APR04)
02-030-25
P
OWER
T
ECH
10.5 L & 12.5 L Diesel Engines
040604
PN=165
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