Revision: 2005 August 2005 350Z
MAIN BEARING OIL CLEARANCE
Method by Calculation
? Install main bearings to cylinder block and main bearing caps,
and tighten main bearing cap bolts with main bearing beam to
the specified torque. Refer to EM-145, "
ASSEMBLY" for the
? Measure the inner diameter of main bearing with bore gauge.
(Bearing clearance) = (Main bearing inner diameter) ? (Crankshaft
main journal diameter)
? If the clearance exceeds the limit, select proper main bearing according to main bearing inner diameter
and crankshaft main journal diameter to obtain the specified bearing oil clearance. Refer to EM-155,
"HOW TO SELECT MAIN BEARING" .
Method of Using Plastigage
? Remove 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
? Install main bearings to cylinder block and main bearing caps, and tighten main bearing bolts with main
bearing beam to the specified torque. Refer to EM-145, "
ASSEMBLY" for the tightening procedure.
Do not rotate crankshaft.
? Remove main bearing caps and bearings, and using scale on
plastigage bag, measure the plastigage width.
The procedure when the measured value exceeds the limit is
same as that described in the ?Method by Calculation?.
CRUSH HEIGHT OF MAIN BEARING
? When main bearing cap is removed after being tightened to the
specified torque with main bearings installed, the tip end of bear-
ing must protrude. Refer to EM-145, "
ASSEMBLY" for the tight-
? If the standard is not met, replace main bearings.
Standard : 0.035 - 0.045 mm (0.0014 - 0.0018 in)
Limit : 0.065 mm (0.0026 in)
Standard : There must be crush height.