Wagoneer L6-242 4.0L VIN M FI (1988)
Crankshaft Main Bearing: Service and Repair
Main Bearing Cap Torque Procedure
INSTALLATION:
1. Lubricate the bearing surface of each insert with engine oil.
2. Install the main bearing upper inserts to the cylinder block.
3. Install the lower bearing inserts into the main bearing caps.
4. Carefully lower the crankshaft into cylinder block.
5. Install the main bearing caps and lower inserts.
6. Torque all cap bolts with the exception of the the thrust bearing cap bolts.
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Tighten bolts of caps to 54 Nm (40 ft lb) torque, then tighten to 95 Nm (70 ft lb) torque. Finally, tighten the main bearing cap bolts to 108 Nm
(80 ft lb) torque.
7. Push the crankshaft forward and backward. Then load the crankshaft (by pushing it front or rear) while tightening the thrust bearing cap bolts.
8. Tighten the thrust bearing cap bolts
^
Torque to 54 Nm (40 ft lb) torque, then tighten to 95 Nm (70 ft lb) torque. Finally, tighten the main bearing cap bolts to 108 Nm (80 ft lb)
torque.
9. Rotate the crankshaft after tightening each main bearing cap to ensure the crankshaft rotates freely.
10. Check crankshaft end play.
