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 TM 55-1905-221-14-4
6-29. CYLINDER BLOCK - MAINTENANCE INSTRUCTIONS (Continued).
LOCATION/ITEM
ACTION
REMARKS
CLEANING (Cont)
(3) If the water jackets are
heavily scaled, proceed
as follows:
(a) Agitate the block in
a bath of inhibited
commercial pickling
acid.
(b) Allow the block to
remain in the acid
bath until the
bubbling stops
(approximately 30
minutes).
(c) Lift the block,
drain it and
re-immerse it in the
same acid solution
for 10 minutes.
(d) Repeat Step (c) until
all scale is removed.
(e) Rinse the block in
clear hot water to
remove the acid
solution.
(f) Neutralize the acid
that may cling to
the casting by
immersing the block
in an alkaline bath.
(g) Wash the block in
clean water or steam
clean it.
6-520
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