TM 5-3895-382-24
1.
Refer to Illustration 88. Use the following tools in order
to measure the length of the connecting rod:
appropriate gauges for measuring distance
measuring pins (1)
2.
Be sure that the measuring pins (1) are parallel. "CRL"
is measured when the bearing for the crankshaft journal
is removed and the original piston pin bearing is
installed.
Measure "CRL". Compare the "CRL" that is measured
to the "CRL" that is given in Table 22. The grade of
length of the connecting rod is determined by the "CRL".
Refer to Table 22 for the correct grade of length.
Distortion Of A Connecting Rod
1.
Use the following tools in order to measure the
distances for the connecting rod (2) which are specified
in Illustration 89:
appropriate gauges for measuring distance
measuring pins (1)
Illustration 89
Measure the connecting rod for distortion.
(1) Measuring pins
(2) Connecting rod
(L) The length between the centers of the piston pin bearing and the
crankshaft journal bearing is shown in Illustration 89.
2.
Measure the connecting rod for distortion and parallel
alignment between the bores.
The bores for the crankshaft bearing and the bearing for
the piston pin must be square and parallel with each
other within the required limits. If the piston pin bearing
is removed, the limit "L" is the following value:
± 0.25 mm (± 0.010 inch).
The limits are measured at a distance of 127 mm (5.0
inch) from each side of the connecting rod.
If the piston pin bearing is not removed, the limit "L" is
the following value: ± 0.06 mm (± 0.0024 inch).
L is equal to 219.08 ± 0.03 mm (8.625 ± 0.001 inch).
3.
Inspect the piston pin bearing and the piston pin for
wear.
4.
Measure the clearance of the piston pin in the piston pin
bearing. Refer to Specifications, "Connecting Rod" for
dimensions.
Crankshaft Seals
Installing The Crankshaft Rear Seal on Type 1 Engines and
9RM Engines
NOTE: For a complete description of Type 1 and Type 2
engines, refer to the Systems Operation, Testing
and
Adjusting,
"Engine
Design"
for
more
information.
Table 23
Tools Needed
9U-6205
Rear Seal Installer Group
1
8T-5096
Dial Indicator Group
1
The crankshaft rear seal has a dust lip that protrudes from the
rear face of the seal. The dust lip can be easily damaged if a
standard seal driver is used for installation. The 9U-6205 Rear
Seal Installer Group will help prevent damage to the dust lip.
NOTE
The crankshaft rear seal is easily damaged.
Extreme care should be used when you install the
crankshaft rear seal. Damage across the lip of the
seal, which can be visually observed, will cause
leakage of oil through the seal.
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