TM 5-3895-382-24
Illustration 90
Crankshaft rear seal.
(A) 2.3 mm (0.09 inch)
(B) 4.6 mm (0.18 inch)
(C) 6.9 mm (0.27 inch)
1.
The seal is at position (A) on new engines. Position (A)
is 2.3 mm (0.09 inch) from the face of the rear housing.
2.
If the oil leaks through the seal which is located at
position (A), use the rear seal installer in order to move
the seal to position (B). Position (B) is 4.6 mm
(0.18 inch) from the rear housing face.
3.
If oil leaks through the seal which is located at position
(B), use the rear seal installer in order to move the seal
to position (C). Position (C) is 6.9 mm (0.27 inch) from
the rear housing face.
Illustration 91
Sealing area on the crankshaft for the rear seal.
4.
If all three seal positions have been used and the seal
leaks, the sealing area of the crankshaft flange can be
reground. The minimum diameter of the crankshaft
flange at the sealing area is 133.17 mm (5.243 inch).
The crankshaft flange requires a diameter that is
unmachined for a distance of 4.78 mm (0.188 inch) from
the rear end of the crankshaft.
Installing the Crankshaft Rear Seal on Type 2
Engines and 7BJ 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 24
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.
6-92
