Crankshaft Main Bearing

General Specifications

INSPECT CRANKSHAFT OIL CLEARANCE

NOTICE:
- Clean the backside of the bearing and the bearing surface of the bearing cap and let not stick the oils and fats.
- The bearing cap bolts are tightened in 2 progressive steps.

a. Clean each main journal and bearing.





b. Install the upper bearing with an oil groove on cylinder block.
c. Install the lower bearing on the bearing cap sub assembly.
d. Place the crankshaft on the cylinder block.





e. Lay a strip of plastigage across each journal.





f. Examine the front marks and install the bearing caps on the cylinder block.
g. Apply a light coat of engine oil on the threads and under the bearing cap bolts.

Installation:

h. Tighten the bolts in several passes, in the sequence shown, by the specified torque.
Torque: 20 Nm (204 kgf-cm, 15 ft. lbs.)
i. Retighten the bolts in several passes, in the sequence shown, by the specified torque.
Torque: 40 Nm (408 kgf-cm, 29 ft. lbs.)
j. Mark the front of the bearing cap bolts with paint.





k. Retighten the bearing cap bolts by 90° in the numerical order shown.
l. Check that the painted mark is now at a 90° angle to the front.

NOTICE: Do not turn the crankshaft.

m. Remove the bearing cap.





n. Measure the plastigage at its widest point.
Standard oil clearance: 0.017 - 0.040 mm (0.0007 - 0.0016 inch)
Maximum oil clearance: 0.07 mm (0.0028 inch)

NOTICE: Completely remove the plastigage.





o. If using a standard 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 selecting the bearing with the same number as the total. There are 4 sizes of standard bearings, marked "1", "2", "3" and "4" accordingly.

Use:

HINT:
EXAMPLE
Cylinder block "4" (A) + Crankshaft "3" (B) =
Total number 7 (Use bearing "3")





Reference


Tightening Procedures

INSTALL CRANKSHAFT
a. Apply engine oil to upper bearing and install the crankshaft on the cylinder block.
b. Apply engine oil to lower bearing.





c. Examine the front marks and install the bearing caps on the cylinder block.
d. Apply a light coat of engine oil on the threads and under the bearing cap bolts.

Installation:

e. Tighten the bolts in several passes, in the sequence shown, by the specified torque.
Torque: 20 Nm (204 kgf-cm, 15 ft. lbs.)
f. Tighten the bolts in several passes, in the sequence shown, by the specified torque.
Torque: 40 Nm (408 kgf-cm, 29 ft. lbs.)
g. Mark the front of the bearing cap bolts with paint.





h. Retighten the bearing cap bolts by 90° in the numerical order shown.
i. Check that the painted mark is now at a 90° angle to the front.
j. Check the crankshaft turns smoothly.