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NOTE: When replacing inserts, the odd size inserts Once the bearings have been properly fitted, pro- ceed to Crankshaft Main Bearing—Installation. BEARING-TO-JOURNAL CLEARANCE (CRANKSHAFT When using Plastigage, check only one bearing clearance at a time. Install the grooved main bearings into the cylinder block and the non-grooved bearings into the bearing caps. Install the crankshaft into the upper bearings dry. crankshaft journal to be checked. Install the bearing cap and tighten the bolts to 108 N·m (80 ft. lbs.) torque. NOTE: DO NOT rotate the crankshaft. This will Remove the bearing cap. Determine the amount of clearance by measuring the width of the compressed Plastigage should indicate the same clearance across the entire width of the insert. If clearance var- If the specified clearance is indicated and there are no abnormal wear patterns, replacement of the bear- ing inserts is not necessary. Remove the Plastigage If the clearance exceeds specification, install a pair of 0.025 mm (0.001 inch) undersize bearing inserts and mea- The clearance indicated with the 0.025 mm (0.001 inch) undersize insert pair installed will determine if CAUTION: Never use a pair of inserts that differ FOR EXAMPLE: DO NOT use a standard size upper insert and a 0.051 mm (0.002 inch) undersize If the clearance exceeds specification using a pair of 0.051 mm (0.002 inch) undersize bearing inserts, crankshaft journal diameter with a micrometer. If the journal diameter is correct, the If journals 1 through 5 diameters are less than 63.4517 mm (2.4981 inches), replace crankshaft or Once the proper clearances have been obtained, proceed to Crankshaft Main Bearing—Installation. MAIN BEARING JOURNAL DIAMETER Remove the crankshaft from the cylinder block (refer to Cylinder Block - Disassemble). Clean the oil off the main bearing journal. with a micrometer. Measure at two locations 90° The maximum allowable taper and out of round is 0.013 mm (0.0005 inch). Compare the measured Once the proper clearances have been obtained, proceed to Crankshaft Main Bearing—Installation. Fig. 35 Measuring Bearing Clearance with Plastigage 1 – PLASTIGAGE SCALE 9 - 24 2.5L ENGINE XJ SERVICE PROCEDURES (Continued) |