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use a tool to install the upper and lower rails. Insert (6) The two compression rings are different and cannot be interchanged. The top compression ring (7) The second compression ring has a slight chamfer on the bottom of the inside edge and a dot (8) Using a ring installer, install the second com- pression ring with the dot facing up (Fig. 27) (Fig. (9) Using a ring installer, install the top compres- sion ring (either side up). Ring Gap Orientation • Position the gaps on the piston as shown (Fig. 30). • Oil spacer - Gap on center line of piston skirt. • Oil rails - gap 180° apart on centerline of piston pin bore. Fig. 24 Ring Side Clearance Measurement 1 – FEELER GAUGE RING SIDE CLEARANCE CHART ITEM SPECIFICATION Top Compression Ring 0.042 - 0.084 mm (0.0017 - 0.0033 in.) Second Compression Ring 0.042 - 0.084 mm (0.0017 - 0.0033 in.) Oil Control Ring 0.06 - 0.21 mm (0.0024 - 0.0083 in.) Fig. 25 Gap Measurement 1 – FEELER GAUGE RING GAP MEASUREMENT CHART ITEM SPECIFICATION Top Compression Ring 0.229 - 0.610 mm (0.0090 - 0.0240 in.) Second Compression Ring 0.483 - 0.965 mm (0.0190 - 0.080 in.) Oil Control Ring 0.254 - 1.500 mm (0.010 - 0.060 in.) Fig. 26 Top Compression ring identification 1 – TOP COMPRESSION RING 9 - 22 4.0L ENGINE WJ SERVICE PROCEDURES (Continued) |