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TM 55-1905-219-14-10
block for cracks without removing the engine from
the equipment which it powers. However, it is
necessary to remove the cylinder heads, blower, oil
cooler, air box covers and oil pan.
Attach sealing plates and gaskets as in method a.
However, before attaching the last sealing plate,
fill the water jacket with a mixture of water
and one gallon of antifreeze. The antifreeze
will penetrate small cracks and its color will
aid in detecting their presence.
Install the remaining sealing plate and tighten
it securely.
Apply 40 psi (275.8 kPa) air pressure to the
water jacket and maintain this pressure for at
least two hours to give the water and antifreeze
mixture ample time to work its way through any
cracks which may exist.
At the end of the test period, examine the cylin-
der bores, air box, oil passages, crankcase and
exterior of the block for presence of the water
and antifreeze mixture which will indicate the
presence of cracks. A cracked cylinder block
must be replaced by a new block.
After the test is completed, remove the plates,
drain the water jacket and blow out all of the
passages in the block with compressed air.
a. After cleaning and pressure/testing, inspect the
cylinder block.
b. Since most of the engine cooling is accomplished
by heat transfer through the cylinder liners to
the water jacket, a good liner-to-block contact
must exist when the engine is operating. When-
ever the cylinder liners are removed from an engine
the block bores must be inspected.


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