Crankshaft Rear Oil Seal and Housing Replacement Housing

Important: Do not remove the crankshaft rear oil seal housing if only replacing the crankshaft rear oil seal.

1. Remove the oil pan.

•	Refer to Oil Pan Replacement .

•	Refer to Oil Pan Replacement .

2. Remove the transmission assembly.

•	Refer to Transmission Replacement in Automatic Transmission - 4L60-E.

•	Refer to Transmission Replacement in Manual Transmission - NV3500.

3. Remove the engine flywheel.

•	Refer to Engine Flywheel Replacement .

•	Refer to Engine Flywheel Replacement .




4. Remove the bolts and the nut holding the crankshaft rear oil seal housing to the engine.
5. Remove the crankshaft rear oil seal housing.



6. Remove and discard the crankshaft rear oil seal housing gasket.
7. Clean all sealing surfaces.
8. Inspect and replace the crankshaft rear oil seal housing for warping, cracks, wear, or damage.

Important: When installing the NEW crankshaft rear oil seal housing the seal will come with the housing. Use the following procedure for installing a new housing. Refer to Crankshaft Rear Oil Seal and Housing Replacement if reusing the housing and installing a new seal.

1. Install a NEW crankshaft rear oil seal housing gasket.



2. Install the NEW crankshaft rear oil seal housing with the seal to the engine block using the following procedure:

Important: Do not oil or grease the seal lip.

2.1.	Leave the sleeve in the crankshaft rear oil seal and use the sleeve as a guide to ease the seal lip over the end of the crankshaft.

2.2.	Push the crankshaft rear oil seal housing with the seal, fully on to the crankshaft until the housing is against the gasket and the engine.

2.3.	Remove the sleeve.

Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

3. Install the bolts and the nut to the crankshaft rear oil seal housing.

Tighten
Tighten the crankshaft rear oil seal housing bolts and nut to 12 N·m (106 lb in).

4. Install the engine flywheel.

•	Refer to Engine Flywheel Replacement .

•	Refer to Engine Flywheel Replacement .

5. Install the transmission assembly.

•	Refer to Transmission Replacement in Automatic Transmission - 4L60-E.

•	Refer to Transmission Replacement in Manual Transmission - NV3500.

6. Install the oil pan.

•	Refer to Oil Pan Replacement .

•	Refer to Oil Pan Replacement .

Crankshaft Rear Oil Seal and Housing Replacement Seal

1. Remove the transmission assembly.

•	Refer to Transmission Replacement in Automatic Transmission - 4L60-E.

•	Refer to Transmission Replacement in Manual Transmission - NV3500.

2. Remove the engine flywheel.

•	Refer to Engine Flywheel Replacement .

•	Refer to Engine Flywheel Replacement .




3. Remove the crankshaft rear oil seal from the crankshaft rear oil seal housing.

Insert a suitable tool into the access notches and then carefully pry the crankshaft rear oil seal from the crankshaft rear oil seal housing.

4. Discard the crankshaft rear oil seal.
5. Clean off any dirt or rust in the area.

Tools Required

J 35621-B Rear Main Seal Installer

Important: Do not oil or grease the seal lip.

1. Use the J 35621-B in order to install the NEW oil seal. Refer to Crankshaft Rear Oil Seal and Housing Installation .
2. Install the engine flywheel.

•	Refer to Engine Flywheel Replacement .

•	Refer to Engine Flywheel Replacement .

3. Install the transmission assembly.

•	Refer to Transmission Replacement in Automatic Transmission - 4L60-E.

•	Refer to Transmission Replacement in Manual Transmission - NV3500.