Usage:
START BY:
a. remove piston cooling jets
b. remove oil pan
1. Use tool (A) to turn the engine flywheel to move counterweights (2) in position for the removal of the main bearing caps. If necessary, the counterweights can be removed.
2. Remove the four bolts, and remove bearing caps (1) from the crankshaft.
3. Remove lower bearing halves (3) from bearing caps (1).
4. Remove thrust plates (4) from each side of the center main bearing.
| NOTICE |
|---|
If the crankshaft is turned in the wrong direction, the tab of the bearing will be pushed between the crankshaft and cylinder block. This can cause damage to either or both. |
5. Install tool (B) in the oil hole in the crankshaft journal, and remove upper main bearing halves (5) as the crankshaft is turned and the bearing is moved out of the cylinder block.
NOTE: On the center main journal that has no oil hole, put a thin piece of soft material that will not damage the crankshaft journal against the end of the bearing, opposite the tab. Hit the bearing with the soft material until the tab of the bearing is free from the cylinder block. Remove the upper half of the main bearing.
Install Crankshaft Main Bearings
| NOTICE |
|---|
Make sure the upper and lower halves of bearings are installed so the bearing tabs fit into the notch in cylinder block and bearing caps. |
NOTE: Install the main bearings dry when the clearance checks are made. Put clean engine oil on the main bearings for final assembly.
1. Install tool (B) in the oil hole of the crankshaft. Put the upper bearing half (half with oil hole) in position on the crankshaft. Use tool (A) to turn the engine flywheel and push the bearing half in position with tool (B).
2. Put clean engine oil on thrust plates (1), and install the plates on each side of the center main bearing.
3. Make sure bearing caps (2) are clean, and install lower bearing halves (3) in the caps.
| NOTICE |
|---|
When Plastigage is used to check bearing clearances, do not use an impact wrench for the torque tightening sequence. For complete details concerning checking bearing clearances, see Engine Bearing And Crankshafts, Form No. SEBD0531. |
NOTE: When the bearing clearance is checked and the engine is in a vertical position, such as in the vehicle, the crankshaft will have to be lifted up and held against the upper halves of the main bearings to get a correct measurement with the Plastigage. The Plastigage will not hold the weight of the crankshaft and give a correct indication. If the engine is in a horizontal position, it is not necessary to hold the crankshaft up. Do not turn the crankshaft when the Plastigage is in position to check clearances.
4. Check the bearing clearances with Plastigage as follows:
a. Put a piece of the Plastigage on the surface of the lower bearing half.
b. Install main bearing caps (2) with the word "FRONT" and the cast part number toward the front of the cylinder block. Each cap has a number on the bottom surface and must be installed in the same position as the correct number on the right side of the block pan rail.
c. Put Fel-Pro C100 Lubricant on the main bearing cap bolts, and hand tighten in number sequence to a torque of 136 ± 14 N·m (100 ± 10 lb.ft.). Then hand tighten the bolts in the number sequence shown 180 ± 5° more.
d. Remove the caps, and measure the Plastigage. The main bearing clearance must be 0.122 to 0.241 mm (.0048 to .0095 in.).
5. Put the bearing caps in position, and tighten the bolts as in Step 4. An impact wrench can be used for the final 180 ± 5° torque tightening turn.
| NOTICE |
|---|
Each counterweight has a number, and must be installed in the same position as the correct number on the crankshaft mounting pad to prevent damage to the crankshaft when the engine is run. |
6. Make sure the dowels are in position, and install counterweights (8) on the crankshaft. Put Fel-Pro C100 Lubricant on the counterweight bolt threads, shank and head seat. Tighten the bolts to a torque of 50 ± 5 N·m (37 ± 4 lb.ft.). Tighten the bolts an additional 120° ± 5° of a turn.
7. Check the crankshaft end play with tooling (C). The end play is controlled by the thrust plates on the center main bearing. End play with new bearings is 0.17 to 0.63 mm (.007 to .025 in.).
END BY:
a. install piston cooling jets
b. install oil pan