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 TM 55-1905-220-14-10
5-43. CYLINDER BLOCK - MAINTENANCE INSTRUCTIONS (Cont).
CLEANING
2.
a. Scrape all gasket material 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 difficult 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 direction of tightening. Then turn it in the opposite direction and back
the plug out. To remove the special plugs in the water-below-port cylinder block:
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.
(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.
5-626
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