Durango 4WD V8-5.9L VIN Z (1998)
Crankshaft Main Bearing Seal: Service and Repair
CRANKSHAFT REAR OIL SEALS
The service seal is a 2 piece, Viton seal. The upper seal half can be installed with crankshaft removed from engine or with crankshaft installed. When
a new upper seal is installed, install a new lower seal. The lower seal half can only be installed with the rear main bearing cap removed.
UPPER SEAL REPLACEMENT-CRANKSHAFT REMOVED
1. Remove the crankshaft. Discard the old upper seal.
2. Clean the cylinder block rear cap mating surface. Make sure the seal groove is free of debris.
3. Lightly oil the new upper seal lips with engine oil.
4. Install the new upper rear bearing oil seal with the white paint facing towards the rear of the engine.
5. Position the crankshaft into the cylinder block.
6. Lightly oil the new lower seal lips with engine oil.
7. Install the new lower rear bearing oil seal into the bearing cap with the white paint facing towards the rear of the engine.
Sealant Application To Bearing Cap
8. Apply 5 mm (0.20 inch) drop of Loctite 518, or equivalent, on each side of the rear main bearing cap. DO NOT over apply sealant or allow the
sealant to contact the rubber seal. Assemble bearing cap to cylinder block immediately after sealant application.
9. To align the bearing cap, use cap slot, alignment dowel and cap bolts. DO NOT remove excess material after assembly. DO NOT strike rear cap
more than 2 times for proper engagement.
10. Clean and oil all cap bolts. Install all main bearing caps. Install all cap bolts and alternately tighten to 115 Nm (85 ft. lbs.) torque.
11. Install oil pump.
Apply Sealant To Bearing Cap To Block Joint
12. Apply Mopar (R) Silicone Rubber Adhesive Sealant, or equivalent, at bearing cap to block joint to provide cap to block and oil pan sealing. Apply
enough sealant until a small amount is squeezed out. Withdraw nozzle and wipe excess sealant off the oil pan seal groove.
13. Install new front crankshaft oil seal.
14. Immediately install the oil pan.
UPPER SEAL REPLACEMENT-CRANKSHAFT INSTALLED
1. Remove the oil pan.
2. Remove the oil pump from the rear main bearing cap.
