Cylinder Block Diagnosis

CYLINDER BLOCK





Diagnosis of cylinder block malfunctions relative to cooling and lubrication have been discussed in those respective systems. The potential problems with the cylinders, the camshaft bore and the crankshaft main journals have also been discussed.





Malfunctions of the block such as leaks, tappet bore wear, etc. require a visual or dimensional inspection to isolate the problem.





The cylinder bores are machined directly into the block during production. The size and condition of the bore is critical to engine performance and life. During repair, be sure to inspect the bore carefully. It may also be necessary to de-glaze the cylinder walls before reassembly.





The cylinder bores can be rebored in a machine shop and fitted with oversize service pistons.

There are two oversize pistons:

0.50mm [0.020 inch]
1.00mm [0.040 inch]

There is also a sleeve available for salvage.





NOTE: The head surface of the block is also critical to sealing the bores. Inspect the surface carefully during repair before assembly. The head deck can be resurfaced in a machine shop and a thicker surface head gasket installed to keep the piston-to-head clearance the same.





After machining, mark the block as follows:

Machining Mark

A - Standard None
B - 0.15mm [0.006 inch] x
C - 0.5Omm [0.020 inch] xx