TM 5-3895-346-14
CYLINDER BLOCK
ENGINE OVERHAUL
necessary to use water hole cover plates and gaskets to seal the water inlet openings in the sides of the block.
One cover plate should be drilled and tapped to provide a connection for an air line so the water jacket can be
pressurized.
METHOD A
This method may be used when a large enough water tank
is available and the cylinder block is completely stripped of
all parts.
1.
Make sure the seal ring grooves in the cylinder bores
of the block are clean. Then install new seal rings in the
grooves (above the air inlet ports).
NOTE
The current blocks have two
seal ring grooves above the air
inlet ports of each cylinder
bore. Only one seal ring is
required, however. Install the
seal ring in the upper groove, if
it is in good condition; if the
upper groove is pitted or
eroded, install the seal ring in
the lower groove.
2.
Apply a light coating of hydrogenated vegetable-type shortening or permanent-type antifreeze solution to
the seal rings.
3.
Slide the cylinder liners into the block, being careful not to roll or damage the seal rings. Install new
compression gaskets and water hole seal rings in the counterbores in the top surface of the block.
4.
Secure the plate(s) on the top of the block with 5/8-11 bolts and flat washers.
5.
Install the water hole cover plates and gaskets on the sides of the block.
6.
Immerse the cylinder block for twenty minutes in a tank of water heated to 180-200 (82-93 ).
F
C
7.
Attach an air line to the water hole cover plate and apply 40 psi (276 kPa) air pressure to the water
jackets and observe the water in the tank for bubbles which will indicate cracks or leaks. A cracked cylinder
block must be replaced by a new block.
8.
Remove the block from the water tank. Then remove the plates, seals, gaskets, and liners and blow out
all of the passages in the block with compressed air.
9.
Dry the cylinder liners with compressed air and coat them with oil to prevent rust.
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