the inside of the oil and water passages.
This permits more efficient cleaning and
eliminates the possibility of the cleaning
Be sure the engine is securely
solution attacking the aluminum core hole
m o u n t e d to the overhaul stand be-
plug gaskets.
fore releasing the lifting sling.
S e v e r e injury to personnel and de-
If a core hole plug is difficult to remove,
struction of engine parts will re-
hold a 3/4" drift against the plug and
sult if the engine breaks away
give
it
a
few
sharp
blows
with
a
f r o m the overhaul stand.
one-pound hammer. With a 1/2" flexible
handle and a short extension placed in
the countersunk hole in the plug, turn
the plug slightly in the direction of
Then turn in the opposite
tightening.
direction and back the plug out.
Clean the cylinder block as follows:
1. Remove the grease by agitating the
cylinder block in a hot bath of commer-
cial heavy duty alkaline solution (see
block
Spreader and Sling
2. Wash the block in a hot water or steam
15. With the engine mounted on the ov-
c l e a n it to remove the alkaline solution.
erhaul stand, remove all of the remaining
subassemblies and parts from the cylin-
3. If the water jackets are heavily
der block.
s c a l e d , proceed as folIows:
The procedure for removing each subas-
A. Agitate the block in a bath of inhibit-
sembly from the cylinder block, together
ed commercial pickling acid.
with disassembly, inspection, repair and
reassembly of each, w i l l b e f o u n d i n t h e
B. Allow the block to remain in the acid
various subsections of this section.
bath until the bubbling action stops
(approximately 30 minutes).
After stripping, the cylinder block must
b e thoroughly cleaned and inspected.
C.
Lift
the
block,
drain
it
and
r e - i m m e r s e it in the same acid solution
for 10 minutes.
Clean Cylinder Block
D.
Repeat
Step
C
until
all
scale
is
re-
Scrape all gasket material from the cylin-
moved.
der block. Then remove all oil gallery
plugs and core plugs (except cap plugs)
to allow the cleaning solution to contact
11B-4