Engine Rear Cover Installation

Tools Required

• J 41480  Front and Rear Cover Alignment - Oil Pan Surface. See Special Tools and Equipment .
• J 41476  Front and Rear Cover Alignment Tool - Crankshaft Oil Seal Area. See Special Tools and Equipment .

Fig 1: View Of Engine Block Rear Oil Gallery Plug
Courtesy of GENERAL MOTORS CORP.
IMPORTANT:
• Do not use the crankshaft rear oil seal or the engine rear cover gasket again.
• Do not apply any type sealant to the rear cover gasket, unless specified.
• The special tools in this procedure are used to properly align the engine rear cover at the oil pan surface and to center the crankshaft rear oil seal.
• The crankshaft rear oil seal will be installed after the rear cover has been installed and aligned. Install the rear cover without the crankshaft oil seal.
  • The crankshaft rear oil seal MUST be centered in relation to the crankshaft.
  • The oil pan sealing surface at the rear cover and engine block MUST be aligned within specifications.
  • An improperly aligned rear cover may cause premature rear oil seal wear and/or engine assembly oil leaks.
1. Inspect the rear oil gallery plug for proper installation.
Fig 2: View Of Rear Cover, Bolts & Gasket
Courtesy of GENERAL MOTORS CORP.
2. Install the rear cover gasket, rear cover and bolts.
3. Tighten the bolts finger tight. Do not overtighten.
Fig 3: View Of J 41480 Installed To Engine Block
Courtesy of GENERAL MOTORS CORP.
NOTE: Refer to Fastener Notice in Cautions and Notices.
IMPORTANT: Start the J 41480  tool-to-rear cover bolts. See Special Tools and Equipment . Do not tighten the bolts at this time.
4. Install the J 41480  and bolts. See Special Tools and Equipment .

   Tighten:  Tighten the tool-to-engine block bolts to 25 N.m (18 lb ft).

Fig 4: View Of J 41480 & J 41476
Courtesy of GENERAL MOTORS CORP.
IMPORTANT: To properly align the rear cover, the J 41476  must be installed onto the rear of the crankshaft with the tool mounting bolts parallel to the oil pan surface. See Special Tools and Equipment .
5. Rotate the crankshaft until 2 opposing flywheel bolt holes are parallel to the oil pan surface.
Fig 5: View Of J 41480 & J 41476 Installed
Courtesy of GENERAL MOTORS CORP.
IMPORTANT: The tapered legs of the alignment tool must enter the rear cover oil seal bore.
6. Install the J 41476  and bolts onto the rear of the crankshaft. See Special Tools and Equipment .

   Tighten: 

   1. Tighten the tool mounting bolts until snug. Do not overtighten.
   2. Tighten the J 41480  tool-to-rear cover bolts evenly to 12 N. See Special Tools and Equipment .m (106 lb in).
   3. Tighten the rear cover bolts to 25 N.m (18 lb ft).

7. Remove the tools.
Fig 6: Checking Rear Cover-To-Engine Block Proper Installation Position
Courtesy of GENERAL MOTORS CORP.
8. Measure the rear cover-to-engine block oil pan surface for flatness.
   1. Place a straight edge onto the engine block and rear cover oil pan sealing surfaces.

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

   2. Insert a feeler gage between the rear cover and the straight edge. The cover must be flush with the oil pan or no more than 0.5 mm (0.02 in) below flush.
9. If the rear cover-to-engine block oil pan surface alignment is not within specifications, repeat the cover alignment procedure.
10. If the correct rear cover-to-engine block alignment at the oil pan surface cannot be obtained, replace the rear cover.