Crankshaft Rear Oil Seal Housing Installation (With Seal in Housing)

Special Tools

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

For equivalent regional tools, refer to Special Tools .

Fig 1: Rear Housing Alignment Tabs
Courtesy of GENERAL MOTORS CORP.
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.
• First design rear housings do not have alignment tabs for alignment of the housing horizontally. J 41476  tool is required to properly align first design rear housings. The rear oil seal must be removed from the housing for proper use of the tool.
• Second design rear housings have alignment tabs for alignment of the housing horizontally. J 41476  tool is not required for proper alignment of second design rear housings. The housing may be installed and aligned with the seal already installed into the housing.
1. Inspect the rear housing to identify for alignment tabs (1).
Fig 2: Engine Block Rear Oil Gallery Plug
Courtesy of GENERAL MOTORS CORP.
2. Inspect the rear oil gallery plug for proper installation.
Fig 3: Rear Housing Gasket, Rear Housing With Seal And Bolts
Courtesy of GENERAL MOTORS CORP.
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 And Rear Cover Alignment
Courtesy of GENERAL MOTORS CORP.
CAUTION:

Refer to Fastener Caution .

8. Install the J 41480  alignment and bolts.
   1. Tighten the tool-to-engine block bolts to 25 N.m (18 lb ft).
   2. Tighten the J 41480  alignment tool-to-rear housing bolts evenly to 12 N.m (106 lb in).
   3. Tighten the rear housing-to-engine block bolts to 30 N.m (22 lb ft).
9. Remove the J 41480  alignment and bolts.
Fig 5: Checking Rear Cover-To-Engine Block Proper Installation Position
Courtesy of GENERAL MOTORS CORP.
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 0.5 mm (0.02 in) below flush.
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.