Detroit Diesel — Installation of Rear Oil Seal Method A
Installation · Crankshaft rear oil seal
From a Detroit Diesel service manual — check it applies to your exact model before use.
Before you start
- Failure to lubricate seal I.D. can cause seal lip damage at startup.
- Do not remove the plastic sealant coating from Series 92 seals.
- Unidirectional seals must match engine rotation (arrow on seal case).
Procedure
- Install the flywheel housing.
- Place oil seal expander J 4239 against crankshaft end (use J 8682 for oversized seal).
- Lubricate the seal I.D., crankshaft or wear sleeve, and expander with clean SAE 30 or 40 oil (non-Teflon seals).
- Install Teflon lip seals dry.
- Slide seal over expander and onto crankshaft with lip toward engine.
- Remove seal expander and guide studs.
- Install crankshaft rear oil seal installer J 21112-B and guide studs J 9727-5.
- Drive seal in place until installer seats squarely on crankshaft butt.
- Remove installer and guide studs; remove excess sealant.
Tools required
- Oil seal expander J 4239 / J 8682 Amazon
- Handle J 3154-1A Amazon
- Installer J 21112-B Amazon
- Guide studs J 9727-5 / J 25002 Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Seal face run-out total not to exceed 0.38 mm (0.015 in.)
Source: Detroit Diesel service manual. Steps and values are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.