We have discussed the cylinder block relative to cooling and lubrication in those respective systems. We have also
discussed the interfaces of some of the above power functions with the block. This discussion will cover the remaining interfaces including the cylinder bores.
The cylinder bores are machined directly into the cylinder block during production. The size and condition of the
cylinder bore is critical to engine performance and life.
During repair, be sure to inspect the cylinder bore carefully. It will also be necessary to deglaze the cylinder walls
before reassembly. A 30 degree crosshatch pattern is needed to seat the new piston rings.
The cylinder bores can be rebored in a machine shop and fitted with an oversize service piston. The cylinder bore
may also be bored to accept a service liner and standard pistons. Refer to the B Series Alternative Repair Manual,
Bulletin No. 3810234 for rebore procedures.
NOTE: The head surface of the block is also critical to sealing the cylinder bores. Inspect the surface carefully during repair before assembly. The cylinder head deck can be resurfaced in a machine shop and a thicker surface cylinder
head gasket installed to keep the piston-to-head clearance the same.
After machining, the cylinder block is identified as follows:
