Montero Sport 2WD V6-3.0L SOHC (1997)
Piston Ring: Testing and Inspection
1. Check the piston ring for damage, excessive wear, and breakage and replace if defects are evident. If the piston has been replaced with a new one,
the piston rings must also be replaced with new ones.
2. Check for clearance between the piston ring and ring groove. If the limit is exceeded, replace the ring or piston, or both.
Standard value
Number 1: 0.03 - 0.07 mm (0.0012 - 0.00027 inch)
Number 2: 0.02 - 0.06 mm (0.0008 - 0.0023 inch)
Limit: 0.1 mm (0.003 inch)
3. Insert the piston ring into the cylinder bore. Force the ring down with a piston, the piston crown being in contact with the ring, to correctly position
it at right angles to the cylinder wall. Then, measure the end gap with a feeler gauge. If the ring gap is excessive, replace the piston ring.
Standard value:
Number 1: 0.30 - 0.45 mm (0.012 - 0.017 inch)
Number 2: 0.45 - 0.60 mm (0.018 - 0.023 inch)
Oil: 0.20 - 0.60 mm (0.008 - 0.023 inch)
Limit:
Number 1 and Number 2: 0.8 mm (0.03 inch)
Oil: 1.0 mm (0.03 inch)
