TM 5-3805-280-24-2
Cylinder Block, Liners, Pistons and Rods
INSPECT PISTON PINS AND BUSHINGS
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1. Visually inspect piston pin. Pin must be in good
condition with no visible wear.
IMPORTANT: Do not attempt to polish or refinish
piston pin. Pin has a highly polished
surface.
2. Dip piston pin in clean engine oil.
3. Install pin (A) through piston. Pin should pass through
piston using only light thumb pressure.
4. Insert pin from both sides. If pin enters freely, but binds
in the center, the bore could be tapered (B).
5. Insert pin to check for bore alignment (C). Pin should
not "click" or need to be forced into bore on opposite
side.
6. Measure piston pin OD. Replace if not within
specification.
Piston Pin (Small)--Specification
OD ............................................................................. 34.920--34.930 mm
(1.3748--1.3752 in.)
Wear Limit ............................................................ 34.907 mm (1.3743 in.)
Piston Pin (Large)--Specification
OD ............................................................................. 41.270--41.280 mm
(1.6248--1.6252 in.)
Wear Limit ............................................................ 41.257 mm (1.6243 in.)
Piston Pin--Specification
Length.................................................... 71.51--72.11 mm (2.815--2.839
A--Piston Pin
in.)
B--Tapered Bore
C--Bore Alignment
Continued on next page
RG,10,DT7407 1912NOV971/2
13-147
