Grand Cherokee 2WD L6-4.0L VIN S (1997)
Piston Ring: Service and Repair
Service Procedures
SIDE GROOVE CLEARANCE
1. Carefully clean the carbon from all ring grooves. Oil drain openings in the oil ring groove and pin boss must be clear. DO NOT remove metal
from the grooves or lands. This will change ring-to-groove clearances and will damage the ring-to-land seating.
2. Be sure the piston ring grooves are free of nicks and burrs.
3. Measure the ring side clearance with a feeler gauge fitted snugly between the ring land and ring. Rotate the ring in the groove. It must move freely
around circumference of the groove.
NOTE: Ring groove height should be:
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A 1.530-1.555 mm (0.0602-0.0612 inch)
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B 4.035-4.060 mm (0.1589-0.1598 inch)
Ring Side Clearance Measurement
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Top Compression Ring: 0.042 to 0.084 mm (0.0017 to 0.0033 inch)
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Second Compression Ring: 0.042 to 0.084 mm (0.0017 to 0.0033 inch)
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Oil Control Ring: 0.06 to 0.21 mm (0.0024 to 0.0083 inch)
