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Use compressed air to blow out the oil passages in the rocker arms and push rods. INSPECTION Inspect the pivot surface area of each rocker arm. Replace any that are scuffed, pitted, cracked or Inspect the valve stem tip contact surface of each rocker arm and replace any rocker arm that is deeply Inspect each push rod end for excessive wear and replace as required. If any push rod is excessively Inspect the push rods for straightness by rolling them on a flat surface or by shining a light between A wear pattern along the length of the push rod is not normal. Inspect the engine cylinder head for PISTONS AND CONNECTING ROD ASSEMBLY INSPECTION—PISTONS (1) Piston Diameter: Size: 91.93-91.94mm (3.6191- 3.6196 in.) Maximum wear limit.05mm (.0019 in.). (2) Check piston pin bores in piston for roundness. Make 3 checks at 120° intervals. Maximum out of (3) The piston diameter should be measured approximately 15 mm (.590 in.) up from the base. (4) Skirt wear should not exceed 0.1 mm (.00039 in.). (5) The clearance between the cylinder liner and piston should not exceed 0.25 mm (.0009 in.). (6) Make sure the weight of the pistons does not differ by more than 5 g. INSPECTION—CONNECTING ROD (1) Assemble bearing shells and bearing caps to their respective connecting rods ensuring that the (2) Tighten bearing cap bolts to 29N·m (21 ft. lbs.) plus 60°. (3) Check and record internal diameter of crank end of connecting rod. NOTE: When changing connecting rods, all four Connecting rods are supplied in sets of four since they all must be of the same weight category. Max NOTE: On one side of the big end of the con-rod The Four digit numbers marked on con rod big end and rod cap must be on the same side INSPECTION—PISTON PIN (1) Measure the diameter of piston pin in the cen- ter and both ends. (2) Piston pin diameter is 29.990 to 29.996mm (1.1807 to 1.1809 in.). Fig. 73 Rocker Arm Components 1 – ROCKER ARM 9 - 44 ENGINE XJ CLEANING AND INSPECTION (Continued) 2000 JEEP CHEROKEE |