Wrangler 4WD L4-150 2.5L VIN P MFI (1998)
1. Lubricate the bearing surface of each insert with engine oil.
2. Loosen all the main bearing caps. Install the main bearing upper inserts
3. Install the lower bearing inserts into the main bearing caps.
4. Install the main bearing cap(s) and lower inserts.
5. Clean the rear main bearing cap (No.5) mating surfaces.
Location Of Loctite 518 (Or Equivalent)
6. Apply Loctite 518, or equivalent on the rear bearing cap. The bead should be 3 mm (0.126 in.) thick. DO NOT apply Loctite 518, or equivalent to
the lip of the seal. Location of Lactate 518 (or equivalent)
7. Install the rear main bearing cap. DO NOT strike the cap more than twice for proper engagement.
8. Tighten the bolts of caps 1, 3, 4 and 5 to 64 Nm (40 ft. lbs.) torque. Now tighten these bolts to 95 Nm (70 ft. lbs.) torque. Finally, tighten these
bolts to 108 Nm (80 ft. lbs.) torque.
9. Push the crankshaft forward and backward. Load the crankshaft front or rear and tighten cap bolt No.2 to 54 Nm (40 ft. lbs.) torque. Len tighten to
95 Nm (70 ft. lbs.) torque and finally tighten to 108 Nm (80 ft. lbs.) torque.
10. Rotate the crankshaft after tightening each main bearing cap to ensure the crankshaft rotates freely.
11. Check crankshaft end play. Crankshaft end play is controlled by the thrust bearing which is flange and installed at the No.2 main bearing position.
a. Attach a magnetic base dial indicator to the cylinder block at either the front or rear of the engine.
b. Position the dial indicator rod so that it is parallel to the center line of the crankshaft.
c. Pry the crankshaft forward, position the dial indicator to zero.
d. Pry the crankshaft forward and backward. Note the dial indicator readings. End play is the difference between the high and low measurements.
Correct end play is 0.038-0.165 mm (0.0015-0.0065 in.). The desired specifications are 0.051-0.064 mm (0.002-0.0025 in.).
Crankshaft End Play Measurement
e. If end play is not within specification, inspect crankshaft thrust faces for wear. If no wear is apparent, replace the thrust bearing and measure
end play. If end play is still not within specification, replace the crankshaft.
12. If the crankshaft was removed, install the crankshaft into the cylinder block.
13. Install the oil pan.
