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(9) Repeat the Plastigage measurement to verify your bearing selection prior to final assembly. (10) Once you have selected the proper insert, install the insert and cap. Tighten the connecting rod Slide snug-fitting feeler gauge between the con- necting rod and crankshaft journal flange (Fig. 30). CRANKSHAFT MAIN BEARINGS INSPECTION Wipe the inserts clean and inspect for abnormal wear patterns and for metal or other foreign material NOTE: If any of the crankshaft journals are scored, Inspect the back of the inserts for fractures, scrap- ings or irregular wear patterns. Inspect the upper insert locking tabs for damage. MAIN BEARING JOURNAL DIAMETER Remove the crankshaft from the cylinder block. Refer to Crankshaft in this section for procedure. Clean the oil off the main bearing journal. with a micrometer. Measure at two locations 90° The maximum allowable taper is 0.008mm (0.0004 inch.) and maximum out of round is 0.005mm (0.002 Fig. 29 Measuring Bearing Clearance with Plastigage 1 – PLASTIGAGE SCALE Bearing Mark SIZE USED WITH JOURNAL SIZE .025 US .025 mm 50.983-50.967 mm (.001 in.) (2.0073-2.0066 in.) Std. STANDARD 50.992-51.008 mm (2.0076-2.0082 in.) .250 US .250 mm 50.758-50.742 mm (.010 in.) (1.9984-1.9978 in.) Fig. 30 Checking Connecting Rod Side Clearance— Typical Fig. 31 Main Bearing Wear Patterns 1 – UPPER INSERT DN 4.7L ENGINE 9 - 27 SERVICE PROCEDURES (Continued) |