Service Limits & General Specifications

MAIN BEARING HOUSING INNER DIAMETER
^ Install main bearing cap without main bearings installed, and tighten main bearing cap bolts to the specified torque.
^ Measure the inner diameter of main bearing housing with a bore gauge.





^ Measure the position shown [5 mm (0.20 in)] backward from main bearing housing front side in the 2 directions as shown. The smaller one is the measured value.
1: Cylinder block
2: Main bearing cap
<-: Engine front
Standard: 55.997 - 56.017 mm (2.2046 - 2.2054 in)
^ If out of the standard, replace cylinder block and main bearing caps assembly.

NOTE: Main bearing caps cannot be replaced as a single, because it is machined together with cylinder block.

MAIN BEARING OIL CLEARANCE
Method by Calculation





^ Install main bearings (3) to cylinder block (1) and main bearing cap (2), and tighten main bearing cap bolts to the specified torque.
A: Example
B: Inner diameter measuring direction
^ Measure the inner diameter of main bearing with a bore gauge. (Bearing oil clearance) = (Main bearing inner diameter) - (Crankshaft main journal diameter)
Standard:
No. 1, 4 and 5 journals: 0.024 - 0.034 mm (0.0009 - 0.0013 in)
No. 2 and 3 journals: 0.012 - 0.022 mm (0.0005 - 0.0009 in)
Limit: 0.065 mm (0.0026 in)
^ If clearance exceeds the limit, select proper main bearing according to main bearing inner diameter and crankshaft main journal diameter to obtain specified bearing oil clearance.

Method of Using Plastigage
^ Remove engine oil and dust on crankshaft main journal and the surfaces of each bearing completely.
^ Cut a plastigage slightly shorter than the bearing width, and place it in crankshaft axial direction, avoiding oil holes.
^ Install main bearings to cylinder block and main bearing cap, and tighten main bearing cap bolts to the specified torque.

CAUTION: Never rotate crankshaft.





^ Remove main bearing cap and bearings, and using the scale (A) on the plastigage bag, measure the plastigage width.

NOTE: The procedure when the measured value exceeds the limit is same as that described in the "Method by Calculation".

MAIN BEARING CRUSH HEIGHT





^ When main bearing cap is removed after being tightened to the specified torque with main bearings (1) installed, the tip end of bearing must protrude (B).
A: Example
Standard: There must be crush height.
^ If the standard is not met, replace main bearings.





MAIN BEARING





Undersize





Bearing Oil Clearance