Crankshaft Rear Oil Seal and Housing Installation

Tools Required

• EN-47623  Rear Main Seal Installer. See Special Tools .
• J 8092  Drive Handle. See Special Tools .
• J 45059  Angle Meter. See Special Tools .

NOTE: Do not apply or use any oil lubrication on the crankshaft rear oil seal, or the seal installer. Do not touch the sealing lip of the oil seal once the protective sleeve is removed. Doing so will damage/deform the seal.
NOTE: Clean the crankshaft sealing surface with a clean, lint free towel. Inspect lead-in edge of crankshaft for burrs/sharp edges that could damage the rear main oil seal. Remove burrs/sharp edges with crocus cloth before proceeding.
1. Clean and inspect the crankshaft rear oil seal housing making sure it is free of any foreign material.
2. With all bolts removed from the housing, place it face up on a flat clean surface.
3. Carefully remove protection sleeve from the new rear oil seal assembly.
Fig 1: Installing Seal To EN-47623
Courtesy of GENERAL MOTORS CORP.
IMPORTANT: Notice the direction of the rear oil seal. The new design seal is a reverse style as opposed to what has been used in the past. "THIS SIDE OUT" has been stamped into the seal as shown in the graphic.
4. Install the seal onto EN-47623  by placing the seal on an angle and using a twisting motion until it is fully seated. See Special Tools .
Fig 2: Installing Crankshaft Rear Oil Seal
Courtesy of GENERAL MOTORS CORP.
5. Place EN-47623  along with. See Special Tools .J 8092  onto the housing as shown and apply a constant downward force until the seal is fully seated. See Special Tools .
Fig 3: Removing Crankshaft Rear Oil Seal Housing
Courtesy of GENERAL MOTORS CORP.
6. Clean the crankshaft sealing surface with a clean, lint free towel. Inspect the crankshaft sealing surface and leading edge of the crankshaft for burrs/sharp edges that could damage the rear main oil seal. Remove any burrs or sharp edges with crocus cloth before proceeding.
NOTE: Do not use a sealant or adhesive when installing this component. Use of a sealant or adhesive can cause improper sealing. A component that is not sealed properly can leak leading to extensive engine damage.
IMPORTANT: Always install a new crankshaft rear oil seal housing gasket.
7. Install a new crankshaft rear oil seal housing gasket and the housing onto the engine.
IMPORTANT: The plastic inserts found on the rear oil seal housing retaining bolts are used to aid production assembly only. The inserts are not required for service.
8. Install the crankshaft rear oil seal housing bolts and finger tighten.
Fig 4: Measuring Cylinder Block Oil Pan Flange & Rear Oil Seal Housing Flange
Courtesy of GENERAL MOTORS CORP.
9. Place a straight edge on the engine block oil pan flange and the crankshaft rear oil seal housing flange. Use a feeler gage to ensure there is no more than 0.10 mm (0.004 in) step on each side. If necessary, gently rotate the crankshaft rear oil seal housing to make the step equal on each side.
NOTE: Refer to Fastener Notice in Cautions and Notices.
10. Tighten the crankshaft rear oil seal housing bolts.

    Tighten:  Tighten the crankshaft rear oil seal housing bolts to 15 N.m (11 lb ft). Use J 45059  to tighten the bolts an additional 50 degrees. See Special Tools .

11. Recheck the step height on each side to ensure the crankshaft rear oil seal housing did not move. If the step height is beyond specification, reinstall the crankshaft rear oil seal housing and measure the step again. Replace the crankshaft rear oil seal housing if the clearance is still beyond specification.