Cherokee 2WD L6-242 4.0L VIN M FI (1987)
Crankshaft Main Bearing Seal: Service and Repair
6-243
This engine uses a two piece type rear main bearing oil seal. Replace both upper and lower seal halves as a unit.
1. Remove rear main bearing cap.
2. Remove upper and lower seal halves, then wipe seal surface area of crankshaft until it is clean.
3. Apply suitable oil to seal lips, then install upper seal in cylinder block. Ensure lip of seal faces toward front of engine.
4. Apply suitable sealing compound to both sides of lower seal end tabs. Use caution not to apply sealant to lip of seal.
5. Coat outer curved surface of lower seal with suitable soap and lip of seal with oil.
6. Install lower seal into bearing cap recess and seat it firmly.
7. Apply sealing compound to both chamfered edges of rear main bearing cap, then install rear main bearing cap and cap attaching bolts. Torque cap
attaching bolts to 80 ft. lbs. Use caution not to apply sealant to cylinder block mating surfaces of rear main bearing cap because bearing to
journal clearance could change.