Crankshaft and Bearing Removal

WARNING: This page is about a different car, the 2015 Chevrolet Malibu. However, it is still accessible from the selected car via links, so may be relevant.

Remove the crankshaft (1) from the block.

Fig 1: Crankshaft
Courtesy of GENERAL MOTORS COMPANY
Remove the crankshaft rear oil seal (2) from the block and discard.
Remove the crankshaft upper bearings (1) and the crankshaft upper thrust bearing (2) from the block.

Fig 2: Crankshaft Upper Bearings
Courtesy of GENERAL MOTORS COMPANY

NOTE: Crankshaft bearings MUST be separated, marked or organized in a way to ensure installation to their original location and position, when suitable for use.
Remove the crankshaft lower bearings (2) from the lower crankcase (1).

Fig 3: Crankshaft Lower Bearings
Courtesy of GENERAL MOTORS COMPANY
Clean the oil, sludge and carbon.
Inspect the oil passages for obstructions.
Inspect the threads.
Inspect the bearing journals and the thrust surfaces for the following conditions:
- Cracks
- Chips
- Gouges
- Roughness
- Grooves
- Overheating (discoloration)
Inspect the corresponding bearing inserts for imbedded foreign material. If foreign material exists find the cause and repair it.
Measure the crankshaft journals. Use a micrometer or dial indicator to measure the taper and runout. Note the result for the later selection of bearing inserts. If not within limits the crankshaft must be replaced.
NOTE: Replace the crankshaft if cracks, severe gouges or burned spots are found. Slight roughness may be removed with a fine polishing cloth soaked in clean engine oil. Burrs may be removed with a fine oil stone.

Note the location of the main bearing high spots. If they are not in line, the crankshaft is bent and must be replaced.