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 TM 55-1905-219-14-11
5-79. CYLINDER BLOCK - MAINTENANCE INSTRUCTIONS (Continued).
LOCATION
ITEM
ACTION
REMARKS
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.
5-1071
(qj
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