Crankshaft Main Bearing
REMOVAL1. Remove engine from vehicle and place on a stand.
2. Remove oil pan and suction tube.
3. Remove the crankshaft rear seal retainer.
4. Remove the front gear housing.
Fig. 178
5. The main bearing caps should be numbered. If they are not, be sure to mark them, beginning with number one at the front and ending with number seven at the rear (Fig. 178).
CAUTION: DO NOT pry on the main caps to free them from the cylinder block.
Fig. 179
6. Use two of the main bearing cap bolts to wiggle the main cap loose (Fig. 179), being careful not to damage the bolt threads. Remove all caps in the same manner.
WARNING: USE A HOIST TO AVOID INJURY.
Fig. 180
7. Lift the crankshaft and gear from the cylinder block (Fig. 180).
8. Remove the main bearings from the block and the main caps.
Fig. 181
9. Remove the piston cooling nozzles by using a 3/16 inch pin punch to push them out (Fig. 181).
CLEANING
Clean the crankshaft oil gallery holes with a nylon brush.
Rinse in clean solvent and dry with compressed air.
INSPECTION
Inspect the rod and main journal for deep scores, signs of overheating and other abnormal marks. Inspect the front and rear seal contact areas of the crankshaft for scratches or grooving.
The service seal kit will position the seal slightly deeper into the seal bore so it will contact the crankshaft at a different location. If this has already been done and the crankshaft has two worn areas, install a wear sleeve to provide a new contact surface for the seal.
1. Visually inspect the tone wheel for missing teeth, cracks, and out-of-round.
NOTE: For additional crankshaft procedures, refer to "Crankshaft Service" in Engine, Service and Repair, Service Procedures.
INSTALLATION
CAUTION: Use only hand force to push the nozzle in place. If driven with a hammer, the nozzle will be damaged.
1. Use a center punch to push the piston cooling nozzle into place. Install nozzles so they bottom out in bore.
2. Make sure the saddle surface is clean and dry. Install the upper main bearings.
3. Install the combination thrust/main bearing in the number six main bearing location.
4. Lubricate the bearings with Lubriplate 105, or equivalent.
WARNING: TO AVOID INJURY, USE A HOIST TO INSTALL THE CRANKSHAFT.
5. If replacing the crankshaft, transfer the tone wheel to the new crankshaft.
a. Install the large section of the tone wheel.
b. Coat the bolts with Mopar Lock 'N Seal or Loctite 242, install and torque to 8 Nm (71 in. lbs.) torque.
c. Rotate the crankshaft and install the small section of the tone wheel.
d. Coat the bolts with Mopar Lock 'N Seal or Loctite 242, install and torque to 8 Nm (71 in. lbs.) torque.
6. Install the crankshaft.
CAUTION: Crankshaft must be lowered onto the bearings straight to prevent damage to thrust bearings.
Fig. 182
7. Install the ring dowels in the main bearing caps (Fig. 182).
8. Install the lower main bearings in the caps.
9. Lubricate the bearings with Lubriplate, or equivalent.
10. Numbers on the main bearings caps face the oil cooler side of the engine with number one at the front of the engine.
11. Place the caps in their respective positions.
12. Lubricate the main bearing bolt threads and underside of the bolt head with clean engine oil.
Fig. 183
13. Tighten the bolts in the sequence shown in (Fig. 183) using the following steps:
- STEP 1-Torque all bolts in sequence to 60 Nm (44 ft. lbs.) torque.
- STEP 2-Torque all bolts in sequence to 119 Nm (88 ft. lbs.) torque.
- STEP 3-Torque all bolts in sequence to 176 Nm (129 ft. lbs.) torque.
14. Turn the crankshaft to determine that it will rotate freely all 360°. Check the main bearing cap installations and/or the bearing sizes if the shaft does not turn easily.
Fig. 184
Fig. 185
15. Verify crankshaft end play: Push the crankshaft towards one end of its thrust and place a dial indicator as shown in (Fig. 184). Zero the indicator needle and push the crankshaft towards the other end of its thrust and record the crankshaft end clearance (Fig. 185).
16. Install the front gear housing.
17. Install the crankshaft rear oil seal retainer.
18. Install the oil pan and suction tube.
19. Install engine into vehicle.