G37x Sedan AWD V6-3.7L (VQ37VHR) (2010)
Calculate by piston skirt diameter and cylinder bore inner diameter
[direction (B), position (D)].
A : Direction A
C : Position C
E : Position E
of : 10 mm (0.39 in)
g : 60 mm (2.36 in)
h : 125 mm (4.92 in)
(Clearance) = (Cylinder bore inner diameter) - (Piston skirt diameter).
Standard and limit : Refer to EM-153, "Cylinder Block". See: Specifications
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If the calculated value exceeds the limit, replace piston and piston pin assembly. Refer to See: Specifications.
Reboring Cylinder Bore
1. Cylinder bore size is determined by adding piston to cylinder bore clearance to piston skirt diameter.
Re-bored size calculation: D = A + B - C where,
A: Piston skirt diameter as measured
B: Piston to cylinder bore clearance (standard value)
C: Honing allowance 0.02 mm (0.0008 in)
D: Bored diameter
2. Install lower cylinder block, and tighten to the specified torque. Otherwise, cylinder bores may be distorted in final assembly.
3. Cut cylinder bores.
NOTE:
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When any cylinder needs boring, all other cylinders must also be bored.
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Do not cut too much out of cylinder bore at a time. Cut only 0.05 mm (0.0020 in) or so in diameter at a time.
4. Hone cylinders to obtain the specified piston to cylinder bore clearance.
5. Measure finished cylinder bore for the out-of-round and taper.
NOTE:
Perform measurement after cylinder bore cools down.
CRANKSHAFT MAIN JOURNAL DIAMETER
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Measure the outer diameter of crankshaft main journals with a micrometer.
Standard : Refer to EM-153, "Cylinder Block". See: Specifications
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If out of the standard, measure the main bearing oil clearance. Then use undersize bearing. Refer to See: Crankshaft Main Bearing/Service and
Repair.
CRANKSHAFT PIN JOURNAL DIAMETER