30. Engine Block Clean and Inspect

Engine Block Cleaning and Inspection

Tools Required
^ J8087 Cylinder Bore Gage
^ J42385-100 Head/Main Bolt Thread Repair Kit

Cleaning Procedure





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

Important: When cleaning the engine block in a thermal type oven, do not exceed 450°F (232°C).

Clean the following components:
^ Remove all sludge, dirt, or debris using a cleaning solvent or thermal type oven.
^ Gasket surfaces
^ Coolant passages
^ Oil galleries
^ Main bearing caps
^ Cylinder head bolt holes to remove threadlocking material Thread repair driver tool J42385-107 may be used to clean the threads of old threadlocking material.

Inspection Procedure
1. Inspect the following components:
^ Cylinder walls for excessive scratches, gouging, or ring ridge
^ Cylinder bores for excessive ring ridge at the top of the cylinder
^ Coolant jacket for cracks
^ Valve lifter bores for excessive scoring or wear
^ Crankshaft bearing webs for cracks
^ Gasket sealing surfaces for excessive scratches or gouging
^ Oil galleries for restrictions
^ Threaded bolt holes for damaged threads

2. Measure the following areas:
^ Cylinder bores for taper
^ 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 a dimension slightly smaller than the bore size.
2. Insert the J8087 bore gage into the micrometer and zero the bore gage dial.





3. Use the J8087 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 at the top, center, and bottom of the bore. A cylinder bore that exceeds the maximum diameter must be serviced with an oversized piston.