Engine Block Cleaning and Inspection

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

Fig 1: Inspecting Engine Block For Flatness

Courtesy of GENERAL MOTORS CORP.

Inspect cylinder block for warpage.
Using a precision straightedge and feeler gauge, measure the warpage of the surface that is in contact with the cylinder head gasket.
Specification: Maximum warpage: 0.05 mm (0.0020 in)
If the warpage is greater than the maximum, replace the cylinder block.

Fig 2: Inspecting Cylinder Bore

Courtesy of GENERAL MOTORS CORP.

Inspect the cylinder bore.
Using a cylinder gauge, measure the cylinder bore diameter at positions A and B in both thrust and axial directions.
Specification:
- Standard diameter: 80.500-80.513 mm (3.1693-3.1698 in)
- Maximum diameter: 80.633 mm (3.1745 in)
If the average diameter of the 4 positions is greater than the maximum, replace the cylinder block.

Fig 3: Identifying Ring Pins

Courtesy of GENERAL MOTORS CORP.

NOTE: It is not necessary to remove the ring pins unless they are being replaced.

Remove the ring pins.
Using a plastic hammer, tap in the ring pins.
Specification: Standard protrusion: 7.5-8.5 mm (0.295-0.335 in)

NOTE: If any of the stud bolts is deformed or the threads are damaged, replace it.

Fig 4: Identifying Straight Pins

Courtesy of GENERAL MOTORS CORP.

CAUTION: Refer to Fastener Caution .

Using a TORX socket E6, install the stud bolts and tighten to 5.0 N.m (44 lb in).

NOTE: It is not necessary to remove the straight pins unless they are being replaced.

Fig 5: Identifying Straight Pin Installation Locations

Courtesy of GENERAL MOTORS CORP.

Fig 6: Identifying Oil Nozzles

Courtesy of GENERAL MOTORS CORP.

Using a 5 mm socket hexagon wrench, install the oil nozzles with the bolts and tighten to 10 N.m (7 lb ft).