Cruze

Engine Block Cleaning and Inspection

Special Tools

EN-8087 Cylinder Bore Gauge

For equivalent regional tool, refer to Special Tools .

1. Remove any old thread sealant, gasket material or sealant.
2. Clean all the following areas with solvent:

•	Sealing surfaces

•	Cooling passages

•	Oil passages

3. Clean all threaded and through holes with solvent.

Warning: Wear safety glasses when using compressed air in order to prevent eye injury.

4. Dry the engine block with compressed air.

1. Inspect the crankshaft bearings journals for damage or spun bearings. The crankshaft bearing journals are not repairable, if the crankshaft bearing journals are damaged the engine block assembly must be replaced.
2. Inspect all sealing and mating surfaces for damage, repair or replace the engine block assembly if necessary.
3. Inspect all threaded and through holes for damage or excessive debris.
4. Inspect all bolts for damage, if damaged replace with NEW bolts only.
5. Inspect the cylinder walls for cracks or damage. The cylinder sleeves are not serviced separately, if the cylinders are damaged the cylinder block assembly must be replaced.
6. Inspect the engine block for cracks. Do not repair any cracks. If cracks are found, the cylinder block assembly must be replaced.

Engine Block Flatness Inspection

1. Inspect the engine block as shown for distortion. Use a straightedge (1).



2. Inspect the engine block as shown for deflection. Use a straightedge (1).

Cylinder bore and crankshaft bearing bore

Note: Old bolts can be used for the measuring procedure.

1. Install the crankshaft bearing cap tie plate and tighten.



2. Inspect the crankshaft main bearing bores. Use the EN-8087 gauge (1) to measure the bearing bore concentricity and alignment. Refer to Engine Mechanical Specifications to find the permitted values.
3. Replace the engine block and crankshaft bearing cap tie plate if the crankshaft bearing bores are out of specification.



4. Inspect the cylinder bores using the EN-8087 gauge (1). Inspect for the following items:

•

Wear

•

Taper

•

Runout

•

Ridging

5. Refer to Engine Mechanical Specifications to find the permitted values.
6. If the cylinder bores are out of specification, replace the engine block.
7. Remove the crankshaft bearing cap tie plate.