GMC Workshop Service and Repair Manuals

Crankshaft: Specifications

Crankshaft Bearing Clearance

Journal #1 - Production .................................................................................................................................  0.018 - 0.053 mm (0.007 - 0.0021 inch)
Journal #2, #3, and #4 - Production ............................................................................................................  0.030 - 0.068 mm (0.0012 - 0.0027 inch)
Journal #5 - Production ...............................................................................................................................  0.020 - 0.060 mm (0.0008 - 0.0024 inch)
Journal #1 - Service .....................................................................................................................................  0.025 - 0.051 mm (0.0010 - 0.0020 inch)
Journal #2, #3, and #4 - Service ..................................................................................................................  0.025 - 0.064 mm (0.0010 - 0.0025 inch)
Journal #5 - Service .....................................................................................................................................  0.038 - 0.063 mm (0.0015 - 0.0025 inch)

Crankshaft End Play ..................................................................................................................................................  0.05 - 0.20 mm (0.002 - 0.008 inch)
Crankshaft Journal Diameter

Journal #1 ................................................................................................................................................  62.189 - 62.212 mm (2.4484 - 2.4493 inch)
Journal #2, #3, and #4 ..............................................................................................................................  62.181 -62.207 mm (2.4481 - 2.4491 inch)
Journal #5 ................................................................................................................................................  62.185 - 62.207 mm (2.4482 - 2.4491 inch)

Crankshaft Journal Out-Of-Round

Production .....................................................................................................................................................................  0.005 mm (0.0002 inch) Max
Service ...........................................................................................................................................................................  0.025 mm (0.0010 inch) Max

Crankshaft Journal Taper

Production) ....................................................................................................................................................................  0.005 mm (0.0002 inch) Max
Service) ..........................................................................................................................................................................  0.025 mm (0.0010 inch) Max

Crankshaft Runout At Rear Flange ..............................................................................................................................................  0.038 mm (0.0015 inch)