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 TM 55-1905-221-14-4
6-29. CYLINDER BLOCK - MAINTENANCE INSTRUCTIONS (Continued).
LOCATION/ITEM
ACTION
REMARKS
CLEANING
5. Cylinder
a. Scrape all gasket material
Block
from the cylinder block.
Then remove all oil gallery
plugs and core hole plugs
(except cup plugs) to allow
the cleaning solution to
contact the inside of the
oil and water passages.
This permits more efficient
cleaning and eliminates the
possibility of the cleaning
solution attacking the
aluminum core hole plug
gaskets (if used).
b. If a core hole plug is diffi-
cult to remove, hold a 3/4
inch drift against the plug
and give it a few sharp blows
with a one pound hammer.
With a 1/2 inch flexible
handle and a short extension
placed in the countersunk
hole in the plug, turn the
plug slightly in the direc-
tion of tightening. Then
turn it in the opposite
direction and back the plug
out.
c. Clean the cylinder block as
follows:
(1) Remove the grease by
agitating the cylinder
block in a hot bath of
commercial heavy-duty
alkaline solution.
(2) Wash the block in hot
water or steam clean it
to remove the alkaline
solution.
6-519
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