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 TM 55-1905-223-24-5
(c) Lightly hit the valve stem with a soft hammer.
(d) Check the connections on the vacuum tester for leaks by starting the pump and holding the cup
against a smooth surface. A decrease in vacuum indicates a loose or leaking connection.
(8) If the total time of the vacuum to decrease from "18" to "8" is less than 10 seconds.
(9) If there are no loose or leading connections on the tester, check for leaks between the valve seat insert
and counterbore.
(a) Apply a coat of grease to the outside diameter of the insert to make a grease seal between the insert
and the counterbore.
(b) Vacuum test and inspect the grease seal. A break in the seal indicates a leak between the insert and
counterbore.
(c) Stake the valve seat insert and vacuum test for leaks.
(10)
If leaks are indicated in step (9) above, disassemble and grind the valve face and/or the valve seat
insert.
(11)
Always clean the cylinder head after any grinding or cutting operation.
(12)
Reassemble the cylinder head.
e. Install the cylinder head (paragraph 2-40).
4-32
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