REMOVE AND INSTALL CRANKSHAFT MAIN BEARINGS

3208 INDUSTRIAL AND MARINE ENGINES

DISASSEMBLY AND ASSEMBLY

CRANKSHAFT MAIN BEARINGS

5. Put clean SAE 30 oil on the upper half of the

new main bearing. Install the upper half of the

main bearing with tool (A).

NOTE: The main bearing half with a hole in it is the

upper bearing.

CAUTION: When installing bearing caps make sure the

number on the side of the cap is next to and respective

with the number on the engine block.

6. Clean the main bearing cap and install the lower

half of the new bearing in the cap.

7. Check the bearing clearance with wire (B). Put

cap (3) in position and install the bolts. Tighten-

bolt (5) to a torque of 30 3 lb.ft. (4.1 0.4

mkg). Tighten bolt (4) to a torque of 30 3 lb.ft.

(4.1 0.4 mkg). Put a mark on both bolt heads

and the bearing cap. Tighten bolt (4) 120 5

more. Tighten bolt (5) 120 50 more.

8. Remove the bearing cap and measure the

thickness of the wire.

The main bearing

clearance must be .002 to .005 in. (0.05 to 0.13

mm). The maximum permissible clearance is

.006 in. (0.15 mm).

9. Put clean SAE 30 oil on the bolt threads, washer

faces and lower half of the main bearing. Put

the bearing cap and lower half of the main

bearing in position on the engine. Install the

bolts. Tighten bolt (5) to a torque of 3Qa: 3 lb.ft.

(4.1 0.4 mkg). Tighten bolt (4) to a torque of

30 3 lb.ft. (4.1 0.4 mkg). Put a mark on both

bolt heads and the cap. Tighten bolt (4) 120 5

more. Tighten bolt (5) 120 5more.

10. Do Steps 2 through 8 for the remainder of the

bearings.

11. Check the crankshaft end play with tooling (D).

The end play is controlled by the thrust bearing

on No. 4 main bearing. The end play with new

bearings must be .006 .003 in. (0.15 0.08

mm). The maximum permissible end play with

used bearings is .014 in. (0.36 mm).

end by:

a) install oil pan.