Cherokee 4WD L6-4.0L VIN S (1998)
Fig.9 Gap Measurement
4. place ring in the cylinder bore and push down with inverted piston to position near lower end of the ring travel. Measure ring gap with a feeler
gauge fitting snugly between ring ends.
Top Compression Ring ............................................................................................................................ 0.229 to 0.610 mm (0.0090 to 0.0240 inch)
Second Compression Ring ....................................................................................................................... 0.483 to 0.965 mm (0.0190 to 0.0380 inch)
Oil Control Ring ......................................................................................................................................... 0.254 to 1.500 mm (0.010 to 0.060 inch)
5. The oil control rings are symmetrical, and can be installed with either side up. It is not necessary to use a tool to install the upper and lower rails.
Insert oil rail spacer first, then side rails.
Fig.10 Top Compression Ring Identification
6. The two compression rings are different and cannot be interchanged. The top compression ring can be identified by the shiny coating on the outer
sealing surface and can be installed with either side up.
Fig.11 Second Compression Ring Identification
7. The second compression ring has a slight chamfer on the bottom of the inside edge and a dot on the top for correct installation.
