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 TM 55-1905-223-24-5
c.
Water pressure test the cylinder head:
(1)
Install a pressure regulator and gauge into a hose that connects to the
water and air supply.
NOTE
The water and air supply must have shut-off valves.
(2)
Set the pressure at 35 to 85 psi (241 to 586 kPa).
(3)
Heat water temperature to 180to 200 (82to 93 ).
F
C
(4)
Connect the hose to the fitting in the plate. Open the drain valve to
remove the air from the cylinder head.
(5)
Open the valve for the water to fill the cylinder head with water.
(6)
Close the valves for the water and drain when all the air has been
removed from the head.
(7)
Open the valve for the air pressure.
(8)
Check the cylinder head for leaks. Be sure to check the areas around the
valve seats and the injector sleeve for leaks or cracks.
(9)
If leaks are observed, replace the cylinder head.
(10) Close the valve for the air pressure.
(11) Open the valve for the water drain to check the water flow through the
cylinder head. If the water does not flow freely, remove the plugs and
injector sleeves and clean the deposits from the water passages.
(12) Remove test equipment.
d.
Valve Seat Inserts. Inspection and replacement procedures. See Table 4-4,
at the end of this procedure, for oversize valve seat insert specifications.
NOTE
To find loose valve seat inserts before they are removed, carefully hit the head
with a wood or rubber hammer. If the insert is loose enough so that it moves,
replace the insert.
(1)
Check the seat area width. If the width is more than 0.125 inch (3.18
mm) and cannot be cut narrower, replace the insert.
4-12
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