Crankshaft Rear Oil Seal Housing Installation

Special Tools

• J 41476  Front and Rear Cover Alignment Tool
• J 41479-2A  Crankshaft Rear Oil Seal Installation Guide
• J 41480  Front and Rear Cover Alignment

Fig 1: View Of Rear Housing Alignment Tabs
Courtesy of GENERAL MOTORS COMPANY
NOTE:
• Do not use the crankshaft rear oil seal or the engine rear housing gasket again.
• Do not apply any type of sealant to the rear housing gasket, unless specified.
• The special tool in this procedure is used to properly align the engine rear housing at the oil pan surface.
• Current design rear housings have alignment tabs for horizontal alignment. J 41476  tool is not required for proper alignment of current design rear housings. The housing may be installed and aligned with or without the seal already installed into the housing.
1. Inspect the rear housing to identify for alignment tabs (1).
Fig 2: View Of Engine Block Rear Oil Gallery Plug
Courtesy of GENERAL MOTORS COMPANY
2. Inspect the rear oil gallery plug for proper installation.
Fig 3: View Of Rear Housing Gasket , Rear Housing With Seal And Bolts
Courtesy of GENERAL MOTORS COMPANY
NOTE:

The J 41479-2A  guide is required when installing the rear housing with the rear oil seal. The J 41479-2A  guide is used to guide and protect the rear seal sealing surface as it is installed over the rear flange of the crankshaft. The J 41479-2A  guide is NOT required when installing the rear housing without rear oil seal.

3. Install the J 41479-2A  guide cone and bolts onto the rear of the crankshaft.
4. Tighten the bolts until snug. Do not overtighten.
5. Install the rear housing gasket (1), rear housing with seal (2), and bolts (3).
6. Tighten the bolts finger tight. Do not overtighten.
7. Remove the J 41479-2A  guide and bolts.
Fig 4: Front Cover Alignment Tool
Courtesy of GENERAL MOTORS COMPANY
CAUTION:

Refer to Fastener Caution .

8. Install the J 41480  cover alignment and bolts.
   1. Tighten the tool-to-engine block bolts to 25 N.m (18 lb ft).
   2. Tighten the J 41480  cover alignment tool-to-rear housing bolts evenly to 12 N.m (106 lb in).
   3. Tighten the rear housing-to-engine block bolts to 25 N.m (18 lb ft).
9. Remove the J 41480  cover alignment and bolts.
Fig 5: Checking Rear Cover-To-Engine Block Proper Installation Position
Courtesy of GENERAL MOTORS COMPANY
10. Measure the rear housing-to-engine block oil pan surface for flatness.
    1. Place a straight edge onto the engine block and rear housing oil pan sealing surfaces.

       Avoid contact with the portion of the gasket that protrudes into the oil pan surface.

    2. Insert a feeler gauge between the rear housing and the straight edge. The housing must be flush with the oil pan or no greater than 0.3 mm (0.0118 in) below flush (a).
11. If the rear housing-to-engine block oil pan surface alignment is not within specifications, repeat the housing alignment procedure.
12. If the correct rear housing-to-engine block alignment at the oil pan surface cannot be obtained, replace the rear housing.