General Motors — Crankshaft Rear Oil Seal Installation (7.4L Engines)
Installation
From a General Motors service manual — check it applies to your exact model before use.
Procedure
- Make sure the crankshaft rear chamfer is free of grit, loose rust, and burrs.
- Lubricate the inner and outer diameter of the seal with engine oil.
- Install the seal on J 38841.
- Position J 38841 against the crankshaft and thread attaching screws into crankshaft tapped holes.
- Tighten screws securely with a screwdriver; turn the handle until it bottoms.
- Remove J 38841.
Tools required
- J 38841 Seal Installer Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Source: General Motors 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.