Main Bearing Oil Clearance
WARNING: This page is about a different car, the 2019 Nissan NV3500 HD, 2019 Nissan NV2500 HD, and 2019 Nissan NV1500. However, it is still accessible from the selected car via links, so may be relevant.
Method by Calculation
- Install main bearings to cylinder block and lower cylinder block, and tighten lower cylinder block bolts to the specified torque. Refer to Disassembly and Assembly for the tightening procedure.
- Measure the inner diameter of main bearing with bore gauge.
(Bearing clearance) = (Main bearing inner diameter) - (Crankshaft main journal diameter)
|
Standard |
: |
0.035 - 0.045 mm (0.0014 - 0.0018 in) (actual clearance) |
|
Limit |
: |
0.065 mm (0.0026 in) |
- If the calculated value exceeds the limit, select proper main bearing according to main bearing inner diameter and crankshaft main journal diameter to obtain specified bearing oil clearance. Refer to How to Select Piston and Bearing .
Method of Using Plastigage
- Remove engine oil and dust on crankshaft main journal and the surfaces of each bearing completely.
- Cut plastigage slightly shorter than the bearing width, and place it in crankshaft axial direction, avoiding oil holes.
- Install main bearings to cylinder block and lower cylinder block, and tighten lower cylinder block bolts to the specified torque. Refer to Disassembly and Assembly for the tightening procedure.CAUTION: Do not rotate crankshaft.
- Remove lower cylinder block and bearings, and using scale on 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".