TM 5-3805-255-14
0088
REAR MAIN OIL SEAL REPLACEMENT
00088
CAUTION
Care should be taken not to damage bore while filing chamfer edge. Failure to follow these
instructions may result in damage to equipment.
Prior to installing seal and wear sleeve, clean bore and crankshaft of all foreign material.
Failure to follow these instructions may result in damage to equipment.
NOTE
When rear main oil seal in flywheel or adapter housing is changed oil seal bore should be
checked for a chamfer. If no chamfer is found use a file to break edge of bore. This should
be done to prevent possible damage to oil seal casing during installation.
If rear oil seal is being installed as part of crankshaft installation disregard steps 1 through
4 inclusive as they were performed as part of crankshaft removal procedure.
1. Remove eight capscrews securing oil seal retainer to flywheel housing.
2. Remove seal retainer (if equipped) and gasket from flywheel housing. Remove oil seal unit from crankshaft.
Remove seal from seal retainer. Remove wear sleeve from crankshaft flange.
3. Inspect flywheel housing surface in area to which seal face plate or retainer is installed. Remove any burrs with
a stone and be sure entire surface is clean. Touch up outside diameter of crankshaft flange chamfer with a
stone to remove roughness or nicks.
4. Determine three evenly spaced tapped holes in crankshaft flange that will be used for driver tool bolts to install
seal and wear sleeve. One tapped hole in flange is offset 0.125 in. (3.1 mm) from equal spacing and must not
be used for installing seal and wear sleeve.
5. Install a new crankshaft seal and wear sleeve as follows:
a. If oil seal (Figure 1, Item 1) and wear sleeve (Figure 1, Item 2) are not unitized (preassembled), assemble
seal to sleeve before installing onto crankshaft as follows:
b. Seal must be clean and lubricated. Coat single lip seal with clean engine oil (WP 0131). Double lip seal
must have cavity between lips filled with grease (WP 0131).
c.
Assemble seal onto sleeve as shown in Figure 1 by pushing seal in direction of arrow.
0088-2
