Crankshaft and Bearing Removal

WARNING: This page is about a different variant/trim than selected.

Special Tools

EN-571 - B Dial Gauge

For equivalent regional tools, refer to Special Tools .

Remove the 2 long lower crankcase bolts (1).

Fig 1: Lower Crankcase Bolts
Courtesy of GENERAL MOTORS COMPANY
Remove the 8 short lower crankcase bolts (2).
Loosen the 10 lower crankcase bolts in the sequence as shown.

Fig 2: Lower Crankcase Bolt Loosening Sequence
Courtesy of GENERAL MOTORS COMPANY
Remove and DISCARD the 10 lower crankcase bolts (2).

Fig 3: Lower Crankcase Bolts
Courtesy of GENERAL MOTORS COMPANY
Loose the lower crankcase (1) from the engine block, use a suitable tool.
Remove the lower crankcase (1).
Clean the sealing surfaces.
Install the EN-571-B gauge (2) along with the bracket (1) to the timing side of the engine block.

Fig 4: Measuring Crankshaft Axial Play
Courtesy of GENERAL MOTORS COMPANY

NOTE: The check is conducted with the crankshaft bearing shells installed in the cylinder block and the flywheel removed. The crankshaft is only loosely fitted in the cylinder block.
If the value for the crankshaft axial play does not correspond with the permissible axial play, regrind the crankcase seat and use a suitable oversize thrust bearing. For oversize thrust bearings, refer to Engine Mechanical Specifications .
Measure the crankshaft axial play. For permissible axial play, refer to Engine Mechanical Specifications .
Remove the 5 crankshaft lower bearings (1) from the lower crankcase (2).

Fig 5: Lower Crankshaft Bearing Shells
Courtesy of GENERAL MOTORS COMPANY

NOTE: Mark the installation position. Set aside in order removed.
Remove the crankshaft (1).

Fig 6: Upper Crankshaft Bearing Shells
Courtesy of GENERAL MOTORS COMPANY
Remove the 4 crankshaft upper bearings (2).
NOTE: Mark the installation position. Set aside in order removed.
Remove the crankshaft thrust upper bearing (4).
NOTE: The second crankshaft bearing from the transmission side contains the thrust bearing.