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 TM 55-1905-220-14-11
5-79.
CYLINDER BLOCK - MAINTENANCE INSTRUCTIONS (Continued).
LOCATION
ITEM
ACTION
REMARKS
INSPECT (Cont)
k. If used, replace damaged or broken cylinder head studs. Drive new studs to a
height of 4 3/8 inch + 1/32 inch above the block at a minimum of 75 lb. ft. (101.7
N ) torque. Also, examine the cylinder head retaining bolt holes. If the threads
m
are damaged, use a tap to "clean-up" the threads or install an helical thread insert.
l. The tapped holes in the cylinder blocks may be tapped with a 5/8 inch-11
UNC3B thread tap. The stud holes and unplugged bolt holes must have the thread
extending 1.84 inches below the block surface.
m. Check the remaining cylinder block surfaces and threaded holes. Check all of
the mating surfaces, or mounting pads, for flatness, nicks and burrs. Clean-up
damaged threads in tapped holes with a tap or install helical thread inserts if
necessary.
n. After inspection, if the cylinder block is not to be used immediately, spray the
machined surfaces with engine oil. If the block is to be stored for an extended
period of time, spray or dip it in a polar-type rust preventive such as Valvoline Oil
Company's "Tectyl 502-C", or equivalent. Castings free of grease or oil will rust
when exposed to the atmosphere.
NOTE
Before a reconditioned or new service replacement cylinder block is used, steam clean it to
remove the rust preventive and blow out the oil galleries with compressed air.
5-1088
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