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(2) Remove cylinder heads, refer to cylinder head removal in this section. (3) Raise vehicle on host. section. (5) Remove top ridge of cylinder bores with a reli- able ridge reamer before removing pistons from cyl- (6) Pistons and connecting rods must be removed from top of cylinder block. Rotate crankshaft so that (7) Remove connecting rod cap. Install connecting rod bolt protectors on connecting rod bolts. Push each NOTE: Be careful not to nick crankshaft journals. (8) After removal, install bearing cap on the mat- ing rod. PISTON PIN—REMOVAL (1) Secure connecting rod in a soft jawed vice. rod. PISTON RING—REMOVAL (1) ID mark on face of upper and intermediate pis- ton rings must point toward piston crown. (2) Using a suitable ring expander, remove upper and intermediate piston rings (Fig. 54). (3) Remove the upper oil ring side rail, lower oil ring side rail and then oil ring expander from piston. (4) Carefully clean carbon from piston crowns, skirts and ring grooves ensuring the 4 oil holes in PISTON RING FITTING (1) Wipe cylinder bore clean. Insert ring and push down with piston to ensure it is square in bore. The (2) If ring gaps exceed dimension given, new rings or cylinder liners must be fitted. Keep piston rings in (3) Check piston ring to groove clearance (Fig. 56). Top compression ring gap.08 to.130mm (.0031 to.0051 PISTON RINGS—INSTALLATION (1) Install rings on the pistons using a suitable ring expander (Fig. 57). (2) Top compression ring is tapered and chromium plated. The second ring is of the scraper type and Fig. 53 Piston Assembly Fig. 54 Piston Rings—Removing and Installing 9 - 36 ENGINE XJ REMOVAL AND INSTALLATION (Continued) 2000 JEEP CHEROKEE |