30. Engine Block Cleaning and Inspection

Engine Block Cleaning and Inspection

- Tools Required
- J 8087 Cylinder Bore Checking Gauge





1. Clean the following areas:

Notice: Do not use a caustic solution to clean the aluminum engine block.

Important: When cleaning an engine block in a thermal type oven, do not exceed 232° C (450° F). The engine block in the solvent, remove all sludge, dirt, or debris.

Caution: Refer to Safety Glasses Caution in Service Precautions.

- Dry the block with compressed air.
- The gasket surfaces
- The coolant passages
- The oil galleries
- The main bearing caps
- The engine block cylinder head bolt holes for threadlocking material
Thread repair driver tool J 42385-107 may be used to clean the threads of old threadlocking material.
2. Inspect the following areas:
- The cylinder walls for excessive scratches, gouging, or ring ridge
- The coolant jacket for cracks
- The valve lifter bores for excessive scoring or wear
- The crankshaft bearing webs for cracks
- The gasket sealing surfaces for excessive scratches or gouging
- The oil galleries for restrictions
- All threaded bolt holes for damage
3. Measure the following areas:
- The cylinder bores for taper
- The cylinder bores for excessive ring ridge at the top of the cylinder

Measuring the Cylinder for Taper, Out-of-Round, and Oversize
1. Adjust the micrometer to 99.0 mm (3.897 inch).





2. Insert the J 8087 into the micrometer and zero the bore gauge dial.
3. Use a bore gauge and measure the cylinder bore for taper, out-of-round, and oversize. Slide the bore gauge up and down throughout the length of the cylinder bore. Check the bore both parallel and perpendicular to the centerline of the crankshaft.
A cylinder that measures 99.0 - 99.018 mm (3.897 - 3.898 inch) may be honed and serviced with a standard size piston.
A cylinder bore that exceeds the maximum diameter must be serviced with an oversized piston.