Q45t V8-4130cc 4.1L DOHC MFI (VH41) (1997)
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Piston Ring: Testing and Inspection
END GAP
Measure the end gap as shown. The standard values are:
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Top ring 0.27 - 0.46 mm (0.0106 - 0.0181 inch)
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2nd ring 0.39 - 0.63 mm (0.0154 - 0.0248 inch)
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Oil ring 0.20 - 0.69 mm (0.0079 - 0.0272 inch)
The maximum limit of ring gap is 1.0 mm (0.039 inch)
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If out of specification, replace piston ring. If gap exceeds maximum limit with new ring, rebore cylinder and use oversized piston and piston rings.
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When replacing the piston, check the cylinder block surface for scratches or seizure.
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If scratches or seizure is found, hone or replace the cylinder block.
SIDE CLEARANCE
Measure the side clearance as shown. The standard values are:
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Top ring 0.040 - 0.080 mm (0.0016 - 0.0031 inch)
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2nd ring 0.030 - 0.070 mm (0.0012 - 0.0028 inch)
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Maximum limit of side clearance is 0.1 mm (0.004 inch).
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If out of specification, replace piston ring. If the clearance exceeds maximum limit with new ring, replace piston.
