Crankshaft Main Bearing

CRANKSHAFT

Temporarily install the 10 main bearing cap bolts to the inside positions.

Insert the main bearing cap by hand until the clearance between the main bearing cap and cylinder block is less than 6 mm (0.236 in.) by marking the 2 internal bearing cap bolts as a guide.






Bolt length 91 mm (3.58 in.)

Temporarily install the 10 main bearing cap bolts to the outside positions.






Bolt length 79.5 mm (3.13 in.)

The main bearing cap bolts are tightened in 2 progressive steps.

Step 1:

Uniformly tighten the 20 main bearing cap bolts in the sequence shown in the illustration.






For inside position - Torque 61 Nm (622 kgf-cm, 45 ft-lbf)

For outside position - Torque 27 Nm (275 kgf-cm, 20 ft-lbf)

If any of the main bearing cap bolts do not meet the specified torque, replace it.

Step 2:

Mark the front of the bearing cap bolts with paint.






Tighten the bearing cap bolts another 90° in the order shown in step 1.
Check that the painted marks are now at a 90° angle to the front.
Check that the crankshaft turns smoothly.

Install and uniformly tighten the 10 main bearing cap bolts and 10 new seal washers in several steps, in the sequence shown in the illustration.






Torque 45 Nm (459 kgf-cm, 33 ft-lbf)

Check that the crankshaft turns smoothly.


MAIN BEARING CLEARANCE, STANDARD & LIMIT














MAIN BEARING SIZE CODES

There are 6 sizes of standard bearings. For the No. 1 and No. 5 position bearings, use bearings marked 4, 5, 6, 7, 8 and 9. For other bearings, use bearings marked 3, 4, 5, 6, 7 and 8.






A = Cylinder block number mark

B = Crankshaft number mark

HINT
(Cylinder block journal diameter - crankshaft journal diameter - 5) X 1000 = A + B

Standard Bearing Chart:

No. 1 and No. 5 Journals






Other Journals:






EXAMPLE:

No. 1 and No. 5 journals

Cylinder block "7" + Crankshaft "6" = Total number 13 (Use upper bearing "6" and lower bearing "7")

Other journals

Cylinder block "7" + Crankshaft "6" = Total number 13 (Use upper bearing "5" and lower bearing "6")

Standard Bearing Chart:

Standard Cylinder Block Crankshaft Journal Bore Diameter (A):






Standard Crankshaft Journal Diameter (B):






Standard Bearing Center Wall Thickness:

No. 1 and No. 5 Journals






Other Journals: