Nissan ENGINE - Page 118

EM-118
< UNIT DISASSEMBLY AND ASSEMBLY >
[VQ40DE]
ENGINE UNIT
• If out of the standard, measure the main bearing oil clearance. Then use undersize bearing.
CRANKSHAFT PIN JOURNAL DIAMETER
• Measure the outer diameter of crankshaft pin journal with
micrometer.
• If out of the standard, measure the connecting rod bearing oil
clearance. Then use undersize bearing.
OUT-OF-ROUND AND TAPER OF CRANKSHAFT
• Measure the dimensions at four different points as shown on each
main journal and pin journal with micrometer.
• Out-of-round is indicated by the difference in the dimensions
between (X) and (Y) at (A) and (B).
• Taper is indicated by the difference in the dimensions between (A)
and (B) at (X) and (Y).
• If the measured value exceeds the limit, correct or replace crankshaft.
• If corrected, measure the bearing oil clearance of the corrected main journal and/or pin journal. Then select
the main bearing and/or connecting rod bearing.
CRANKSHAFT RUNOUT
• Place V-block on precise flat table, and support the journals on
both ends of crankshaft.
• Place dial indicator straight up on the No. 3 journal.
• While rotating crankshaft, read the movement of the pointer on dial
indicator. (Total indicator reading)
• If it exceeds the limit, replace crankshaft.
CONNECTING ROD BEARING OIL CLEARANCE
Method by Calculation
Standard : 69.951 - 69.975 mm (2.7540 - 2.7549 in) dia.
Standard : 53.956 - 53.974 mm (2.1242 - 2.1250 in) dia.
PBIC0127E
Limit:
Out-of-round [Difference between (X) and (Y)]
: 0.002 mm (0.0001 in)
Taper [Difference between (A) and (B)]
: 0.002 mm (0.0001 in)
SBIA0535E
Standard : Less than 0.05 mm (0.002 in)
Limit : 0.10 mm (0.0039 in)
SEM346D
Revision: January 2013 2013 Xterra