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 TM 55-1905-223-24-3
(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 valve seats and/or injector sleeve as necessary.
(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 4-3 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.
(2) Use the following tools to cut the counterbore:
Valve seat insert tool kit
Valve seat insert cutter
Valve guide arbor
(a) Install the arbor into the valve stem guide. Put the adapter sleeve from the tool kit onto the arbor.
(b) Loosen the clamp screws for the swivel and the gear case.
(c) Remove the gear case.
(d) Install the base and swivel onto the arbor and adapter sleeve.
(e) Be sure that the base is flat against the cylinder head.
(f)
Use a capscrew to fasten the base to the cylinder head. Do not tighten the capscrew.
(3) Use a seat driver from the tool kit.
(a) The driver must have the same diameter as the cutter.
(b) Install the driver over the arbor and adapter sleeve and through the swivel.
4-34
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