Cherokee 4WD L6-4.0L VIN S (1998)
Crankshaft Main Bearing: Service and Repair
Removal and Installation
REMOVAL
1. Disconnect negative cable from battery.
2. Remove the spark plugs.
3. Raise the vehicle.
4. Remove the oil pan and oil pump.
Fig.49 Removing Main Bearing Caps And Lower Inserts
5. Remove only one main bearing cap and lower insert at a time.
6. Remove the lower insert from the bearing cap.
Fig.50 Removing Upper Inserts
7. Remove the upper insert by LOOSENING (DO NOT REMOVE) all of the other bearing caps. Now insert a small cotter pin tool in the crankshaft
journal oil hole. Bend the cotter pin as illustrated to fabricate the tool. With the cotter pin tool in place, rotate the crankshaft so that the upper
bearing insert will rotate in the direction of its locking tab. Because there is no hole in the No.3 main journal, use a tongue depressor or similar
soft-faced tool to remove the bearing insert. After moving the insert approximately 25 mm (1 inch), it can be removed by applying pressure under
the tab.
8. Using the same procedure described above, remove the remaining bearing inserts one at a time for inspection.
INSTALLATION
