GMC Workshop Service and Repair Manuals

Crankshaft: Specifications
Journal/Bearing Dimensions

Journal/Bearing Dimensions 

Crankshaft Journals

Main Bearing Journal Diameter

Note:  Front, 2.4484-2.4493 inches; intermediate,

2.4481-2.4490 inches; rear,2.4479-2.4488 inches.

Connecting Rod Journal Diameter

2.0986-2.0998 in 

Maximum Out Of Round All

0.001 in 

Maximum Taper All

0.001 in 

Runout Service Limit

Note:  If main journals are misaligned, crankshaft is bent

and should be replaced.

Bearing Clearance

Main Bearings

Note:  Production: Front, .0008-.0020 inch; intermediate,

.0011-.0023 inch;rear, .0017-.0032 inch. Service: Front,

.001-.0015 inch; intermediate,.001-.0025 inch; rear,

.0025-.0035 inch.

Thrust Bearing

.002-.006 in