Crankshaft Main Bearing Torque and Sequence
General SpecificationsINSPECT CRANKSHAFT OIL CLEARANCE
HINT: Main bearings come in widths of 19.0 mm (0.748 inch) and 22.4 mm (0.882 inch). Install the 22.4 mm (0.882 inch) bearings in the No. 1 and No. 4 cylinder block journal positions with the main bearing cap. Install the 19.0 mm (0.748 inch) bearings in the No. 2 and No. 3 positions.
a. Clean each main journal and bearing.
b. Align the bearing claw with the claw groove of the cylinder block, and push in the 4 upper bearings.
NOTICE: Do not apply engine oil to the bearing and its contact surface.
c. Align the bearing claw with the claw groove of the main bearing cap, and push in the 4 lower bearings.
NOTICE: Do not apply engine oil to the bearing and its contact surface.
HINT: A number is marked on each main bearing cap to indicate the installation position.
d. Place the crankshaft on the cylinder block.
e. Lay a strip of plastigage across each journal.
f. Examine the front marks and numbers and install the bearing caps on the cylinder block.
g. Apply a light coat of engine oil on the threads and under the head of bearing cap bolts.
h. Temporarily install the 8 main bearing cap bolts to the inside positions.
i. Insert the main bearing cap with hand until the clearance between the main bearing cap and the cylinder block will become less than 6 mm (0.23 inch) by making the 2 internal bearing cap bolts as a guide.
j. Using a plastic-faced hammer, lightly tap the bearing cap to ensure a proper fit.
k. Apply a light coat of engine oil on the threads and under the head of main bearing cap bolts.
l. Install and uniformly tighten the 16 main bearing cap bolts in several passes, in the sequence shown.
Torque: 22 Nm (224 kgf-cm, 16 ft. lbs.)
m. Mark the front side of the bearing cap bolts with paint.
n. Retighten the bearing cap bolts by 90° in the sequence shown.
o. Check that the painted mark is now at a 90° angle to the front.
NOTICE: Do not turn the crankshaft.
Installation:
p. Install and uniformly tighten the 8 main bearing cap bolts in several passes, in the sequence shown.
Torque: 27 Nm (275 kgf-cm, 20 ft. lbs.)
HINT: Use a short bolt for the marked position (an arrow)
q. Remove the main bearing caps.
r. Measure the Plastigage at its widest point.
Standard oil clearance:
No. 1 and No. 4 journals 0.014 - 0.034 mm (0.0006 - 0.0013 inch)
No. 2 and No. 3 journals 0.026 - 0.046 mm (0.0010 - 0.0018 inch)
Maximum clearance:
No. 1 and No. 4 journals 0.05 mm (0.0020 inch)
No. 2 and No. 3 journals 0.06 mm (0.0024 inch)
If the oil clearance is greater than maximum, replace the bearings. If necessary, replace the crankshaft.
NOTICE: Completely remove the plastigage.
s. If using 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 for the appropriate bearing number. The No. 1 and No. 4 journal bearing sizes, marked "3", "4", "5", "6" and "7" accordingly. The No. 2 and No. 3 journal bearings have 5 standard bearing sizes, marked "1", "2", "3", "4" and "5" accordingly.
No. 1 and No. 4 journal bearings
HINT:
EXAMPLE
Cylinder block "06" (A) + Crankshaft "08" (B)
=Total number 14 (Use bearing "5")
No. 2 and No. 3 journal bearings
HINT:
EXAMPLE
Cylinder block "06" (A) + Crankshaft "08" (B)
=Total number 14 (Use bearing "3")
Tightening Procedures
INSTALL CRANKSHAFT
a. Apply engine oil to upper bearing and install the crankshaft on the cylinder block.
b. Examine the front marks and numbers and install the bearing caps on the cylinder block.
c. Apply a light coat of engine oil on the threads and under the head of bearing cap bolts.
d. Temporarily install the 8 main bearing cap bolts to the inside positions.
e. Insert the main bearing cap with hand until the clearance between the main bearing cap and the cylinder block will become less than 6 mm (0.23 inch) by making the 2 internal bearing cap bolts as a guide.
f. Using a plastic-faced hammer, lightly tap the bearing cap to ensure a proper fit.
g. Apply a light coat of engine oil on the threads and under the head of main bearing cap bolts.
h. Install and uniformly tighten the 16 main bearing cap bolts in several passes, in the sequence shown.
Torque: 22 Nm (224 kgf-cm, 16 ft. lbs.)
i. Mark the front side of the bearing cap bolts with paint.
j. Retighten the bearing cap bolts by 90° in the sequence shown.
k. Check that the painted mark is now at a 90° angle to the front.
l. Check that the crankshaft turns smoothly.
m. Install and uniformly tighten the 8 main bearing cap bolts in several passes, in the sequence shown.
Torque: 27 Nm (275 kgf-cm, 20 ft. lbs.)
HINT: Use a short bolt for the marked position (an arrow)