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 TM 55-1905-223-24-5
CAUTION
Put the cylinder head on a wood surface to prevent
damage to the surface of the cylinder head.
NOTE
Always use new valve spring collets.
c.
Compress the valve springs and install new valve spring collets.
NOTE
Cylinder heads that have two valve springs for each
exhaust valve require a heavy duty spring guide at
the top of the springs, and two spring wear plates
at the bottom of the springs.
d.
Test the valve seats.
CAUTION
Never vacuum test a cylinder head with the injectors
installed. Installing the injectors can cause the valves
to be out of alignment and will show leakage during the
vacuum test. When the cylinder head is installed to the
cylinder block, installing the injectors will not cause
the valves to go out of alignment.
(1) Use the valve vacuum tester to check the seal between the valve and the valve seat.
(2) Be sure that the valve and valve seats are clean and dry.
(3) Put the vacuum cup over the valve. The O-ring in the cup must make a seal on the cylinder head
around the valve.
(4) Turn the shutoff valve to the open position. Hold down the pushbutton to stop the vacuum pump.
(5) Operate the vacuum pump until the vacuum gauge indicates between 18 to 25 in Hg (457 to 635 mm
Hg).
(6) Turn the shutoff valve to the closed position. Release the pushbutton to stop the vacuum pump.
(7) Check the time for the gauge to indicate a decrease in vacuum.
(a) Start timing when the gauge indicates "18".
(b) Stop timing when the gauge indicates "8." The total amount of time must not be less than 10
seconds.
4-31
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