Crankshaft Main Bearing: Specifications

CRANKSHAFT

Temporarily install the 8 main bearing cap bolts to the inside positions.

Insert the main bearing cap by hand until the clearance between the main bearing cap and the cylinder block is less than 6 mm (0.23 in.) by marking the 2 internal bearing cap bolts as a guide.






Bolt length:
100 to 102 mm (3.94 to 4.02 in.)

Install the 8 main bearing cap bolts to the outside positions.






Bolt length:
105.5 to 107.5 mm (4.15 to 4.23 in.)

Install the crankshaft bearing cap bolts.






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

Step 1

Install and uniformly tighten the 16 crankshaft bearing cap bolts in the sequence shown in the illustration.

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

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

Step 2






Mark the front of the bearing cap bolts with paint.
Retighten the bearing cap bolts 90° in the order above.
Check that the painted mark is now at a 90° angle to the front.

Install 8 new seal washers and uniformly tighten the 8 crankshaft bearing cap bolts in several steps and in the sequence shown in the illustration.






Torque 52 Nm (525 kgf-cm, 38 ft-lbf)

Bolt (A) length: 45 mm (1.77 in.)
Except bolt (A) length: 30 mm (1.18 in.)

Check that the crankshaft turns smoothly.
Check the crankshaft thrust clearance

MAIN BEARING CLEARANCE, STANDARD & LIMIT









MAIN BEARING SIZE CODES


If replacing a bearing, replace it with one having the same number. If the number of the bearing cannot be determined, select the correct bearing by adding together the numbers imprinted on the cylinder block and crankshaft, then refer to the table below for the appropriate bearing number. There are 5 sizes of standard bearings, marked "1", "2", "3", "4" and "5" accordingly.

Journal bearings::

EXAMPLE: Cylinder block "11" + Crankshaft "06" = Total number 17 (Use bearing "3")

Crankshaft main journal diameter:






Standard upper bearing center wall thickness (No. 1 and No. 4 journals):






Standard lower bearing center wall thickness (No. 1 and No. 4 journals):






Standard upper bearing center thickness (No. 2 and No. 3 journals):






Standard lower bearing center thickness (No. 2 and No. 3 journals):