TM 10-3950-672-24-2
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 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
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, the block is identified as follows:
Machining
Mark
A - Standard
None
B - 0.15mm [0.006 inch]
X
C - 0.35mm [0.014 inch]
XX
5-168