30. Engine Block Clean and Inspect
Engine Block Cleaning and InspectionTools Required
^ J8087 Cylinder Bore Gage
^ J42385-100Head/Main Bolt Thread Repair Kit
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. Refer to Cleanliness and Care.
^ Caution: Refer to Safety Glasses Caution in Service Precautions.
Dry the block with compressed air.
^ The gasket surfaces. Refer to Replacing Engine Gaskets.
^ The coolant passages
^ The oil galleries
^ The main bearing caps
^ The engine block head bolt holes for thread-locking material. Thread repair tool J42385-107 may be used to clean the threads of old thread-locking 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. Refer to Replacing Engine Gaskets.
^ 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 J8087 into the micrometer and zero the bore gauge dial.
3. Use a bore gage and measure the cylinder bore for taper, out-of-round, and oversize. Slide the bore gage 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.