
Install the seal ring, Part No. 3823848, and the vacuum
cup, Part No. 3823847, to the vacuum hose.
NOTE: The valves and the valve seats must be clean and
dry when vacuum testing.
Cover the valve with the cup and the seal.
NOTE: The seal must make a tight contact on the cylinder
head around the valve. The seal must completely fill the two
milled areas between the valves.
Move the toggle switch (1) to the ‘‘ON’’ position.
Turn the vacuum control valve (2) to the ‘‘OPEN’’ position.
NOTE: The vacuum control valve is in the ‘‘OPEN’’ position
if the vacuum gauge needle moves clockwise.
Operate the vacuum pump until the gauge indicates the
specified vacuum.
Valve to Valve Seat Vacuum
mm-Hg in-Hg
5.08 MIN 20
6.35 MAX 25
Turn the toggle switch (1) to the ‘‘OFF’’ position.
Cylinder Head Cylinder Head - Vacuum Testing Valve Seating for Reuse (02-10)
N14 Page 2-39
Perfect..