Engine Block Cleaning and Inspection
Engine Block Cleaning and Inspection
Special Tools
* J 8087 - Cylinder Bore Gauge
* 42385-100 - Head/Main Bolt Thread Repair Kit
For equivalent regional tools, refer to Special Tools Special Tools
Cleaning Procedure
Caution:
Do not use a caustic solution to clean the aluminum engine block.
Note:
When cleaning the engine block in a thermal type oven, do not exceed 232°C (450°F).
Clean the following components:
* Remove all sludge, dirt, or debris using a cleaning solvent or thermal type oven. Refer to Cleanliness and Care Cleanliness and Care.
* Gasket surfaces
Refer to Replacing Engine Gaskets Replacing Engine Gaskets.
* Coolant passages
* Oil galleries
* Main bearing caps
* Cylinder head bolt holes to remove threadlocking material
Thread repair tool J 42385-107 may be used to clean the threads of any residual 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
Refer to Replacing Engine Gaskets Replacing Engine Gaskets.
* Oil galleries for restrictions
* Threaded bolt holes for damaged threads
* Cylinder bores for excessive ring ridge at the top of the cylinder
2. Measure the cylinder bores for an oversize condition:
Measuring the Cylinder for Oversize
1. Adjust the micrometer to a dimension slightly smaller than the bore size. Refer to Engine Mechanical Specifications (RPO LMF VIN 4) Service Limits & General SpecificationsEngine Mechanical Specifications (RPO L20 VIN A) Service Limits & General SpecificationsEngine Mechanical Specifications (RPO LC8 VIN B) Service Limits & General SpecificationsEngine Mechanical Specifications (RPO L96 VIN G) Service Limits & General Specifications.
2. Insert the J 8087 - gauge into the micrometer and zero the bore gauge dial.
3. Use the J 8087 - gauge and measure the cylinder bore for oversize.
Slide the bore gauge up and down throughout the length of the cylinder bore. Measure 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. Refer to Engine Mechanical Specifications (RPO LMF VIN 4) Service Limits & General SpecificationsEngine Mechanical Specifications (RPO L20 VIN A) Service Limits & General SpecificationsEngine Mechanical Specifications (RPO LC8 VIN B) Service Limits & General SpecificationsEngine Mechanical Specifications (RPO L96 VIN G) Service Limits & General Specifications.