Crankshaft, Main Bearings and Flywheel/Crankshaft DETERMINE CRANKSHAFT MAIN BEARING CLEARANCE USING “PLASTIGAGE” 1. Place a strip of “PLASTIGAGE” in the center of the bearing. CD7145 -UN-23MAY95 2. Install cap and tighten cap screws to 120 N·m (85 lb-ft) for engines prior to serial number 135641CD and to 135 N·m (100 lb-ft) for other engines. 3. Remove cap and compare the width of “PLASTIGAGE” with scale provided on side of package to determine clearance. 4. Maximum permissible clearance is 0.15 mm (0.006 in.). CTM3274 (01JUL99) 15-21 Saran Liter Engines CD,3274,G15,17 -19-01FEB94 060799 PN=118 MAIN BEARING CLEARANCE 1.
Install main bearing inserts and caps then tighten cap screws to 120 N·m (85 lb-ft) for engines prior to serial number 135641CD and to 135 N·m (100 lb-ft) for other engines. -UN-07MAR95 2. Measure I.D. of main bearing (assembled) and compare with specification. MAIN BEARINGS (ASSEMBLED) ID SPECIFICATIONS CD7149 Main bearings assembled ID (Standard) . . . . . . . . . . . . . . . . . . . . . . 79.396—79.440 mm (3.126—3.127 in.) Clearance . . . . . . . . . . . . . . . . . . . . . . . . . 0.046—0.116 mm (0.0018—0.0046 in.) Maximum wear . . . . . . . . . . . . . . . . . . . 0.15 mm (0.006 in.) 3.
If main bearings (assembled) ID or clearance are not within specifications, regrind or replace crankshaft. NOTE: This clearance can also be determined using “PLASTIGAGE”. If engine had a previous major overhaul and undersized bearing inserts were used, I.D. and O.D. dimensions listed above may not be the same as those recorded. However, the bearing clearance should be within specifications. CD,3274,G15,23 -19-01FEB94 15 21