62. Crankshaft Rear Oil Seal and Housing Installation

^ Tools Required
- J 35621-B Rear Main Seal Installer

NOTICE: Refer to Fastener Notice in Service Precautions.





1. Install the crankshaft rear oil seal housing retainer stud.
^ Tighten the crankshaft rear oil seal housing retainer stud to 6 Nm (53 lb in).

IMPORTANT: Always use a NEW crankshaft rear oil seal housing gasket when installing the crankshaft rear oil seal housing.

2. Install the NEW crankshaft rear oil seal housing gasket and the crankshaft rear oil housing onto the crankshaft rear oil seal housing retainer stud.
3. Install the crankshaft rear oil seal housing nut and bolts.
^ Tighten the crankshaft rear oil seal housing nut and bolts to 12 Nm (106 lb in).





4. Apply a small amount (2 to 3 drops) of clean engine GM P/N 12345610 or equivalent oil to the bore of the crankshaft rear oil seal housing.
5. Inspect the outside diameter of the engine flywheel pilot flange for imperfections or rust. Minor imperfections and/or rust may be removed with a fine grade emery cloth.
6. Apply a small amount (2 to 3 drops) of clean engine GM P/N 12345610 or equivalent oil to the outside diameter of the engine flywheel pilot flange.
7. Apply a small amount (1 drop) of clean engine oil GM P/N 12345610 or equivalent to the outside diameter of the flywheel locator pin.
8. Apply a small amount of clean engine GM P/N 12345610 or equivalent oil to the crankshaft seal surface.
9. Inspect the J 35621-B flange for imperfections that may damage the crankshaft rear oil seal. Minor imperfections may be removed with a fine grade emery cloth.

IMPORTANT: DO NOT allow oil or any other lubricants to contact the seal lip surface of the crankshaft rear oil seal.

10. Remove the installation guide from the NEW crankshaft rear oil seal.
11. Apply a small amount (2 to 3 drops) of clean engine oil GM P/N 12345610 or equivalent to the outside diameter of the NEW crankshaft rear oil seal.
12. Install the NEW crankshaft rear oil seal onto the J 35621-B.
13. Install the J 35621-8 onto the rear of the crankshaft and hand tighten the tool bolts until snug.

NOTICE: Proper alignment of the crankshaft rear oil seal is critical. Install the crankshaft rear oil seal near to flush and square to the crankshaft rear oil seal housing. Failing to do so may cause the crankshaft rear oil seal or the crankshaft rear oil seal installation tool to fail.

IMPORTANT: A properly installed crankshaft rear oil seal will be near to flush and square to the crankshaft rear oil seal housing.

14. Install the crankshaft rear oil seal onto the crankshaft and into the crankshaft rear oil seal housing.
14.1. Turn the J 35621-B wing nut clockwise until the crankshaft rear oil seal is installed near to flush and square to the crankshaft rear oil seal housing. Increased resistance will be felt when the crankshaft rear oil seal has reached the bottom of the crankshaft rear oil seal housing bore.
14.2. Turn the J 35621-B wing nut counter clockwise to release the J 35621-B from the crankshaft rear oil seal.
15. Remove the J 35621-B from the crankshaft.
16. Wipe off any excess engine oil with a clean rag.