Removal and Installation

CRANKSHAFT MAIN BEARING CRANKSHAFT NOT REMOVED


CAUTION: Cylinder liner clamps are to be used when cylinder heads have been removed.

Bearing caps are not interchangeable and should be marked at removal to insure correct assembly. Upper and lower bearing halves are NOT interchangeable. Lower main bearing halves of 1, 2, 4, 5 and 6 are interchangeable. Upper main bearing halves of 1, 2, 4, 5 and 6 are interchangeable.

1. Loosen the dipstick tube mounting screw and remove the oil pan, oil pick-up tube and identify bearing caps before removal.







2. Remove bearing caps one at a time. Remove upper half of bearing by inserting Special Main Bearing Tool C-3059 into the oil hole of crankshaft.
3. Slowly rotate crankshaft clockwise, forcing out upper half of bearing shell.

CAUTION: When cleaning the gasket surfaces use a gasket remover to soften the old gasket material. Also, to avoid damage to the mating surfaces, do


INSTALLATION

Only one main bearing should be selectively fitted while all other main bearing caps are properly tightened.

When installing a new upper bearing shell, slightly chamfer the sharp edges from the plain side.

1. Start bearing in place, and insert Main Bearing Tool C-3059 into oil hole of crankshaft.
2. Slowly rotate crankshaft counter-clockwise sliding the bearing into position. Remove Special Main Bearing Tool C-3059.
3. Install each main cap and tighten bolts finger tight.
4. Tighten main cap bolts in the following torque sequence:

Step 1 Tighten the main caps bolts in the sequence shown in to 20 Nm (15 ft. lbs.). This will seat the bearing caps onto the engine block.

Step 2 To ensure correct thrust bearing alignment the following procedure must be done:

a. Move crankshaft all the way to the rear of its travel.
b. Then, move crankshaft all the way to the front of its travel.
c. Wedge an appropriate tool between the rear of the cylinder block and rear crankshaft counterweight. This will hold the crankshaft in it's most forward position.

Step 3 Tighten the 9/16 bolts to 68 Nm (50 ft. lbs.) and the 7/16 bolts to 20 Nm (30 ft. lbs.).

Step 4 Tighten the 9/16 bolts to 115 Nm (85 ft. lbs) and the 7/16 bolts to 61 Nm (45 ft. lbs.).

5. Remove the holding tool.



CRANKSHAFT MAIN BEARINGS
Bearing caps are not interchangeable and should be marked at removal to insure correct assembly. Upper and lower bearing halves are NOT interchangeable. Lower main bearing halves of 1, 2, 4, 5 and 6 are interchangeable. Upper main bearing halves of 1, 2, 4, 5 and 6 are interchangeable.