April, 2019 IMPCO Technologies PPI-68 REV. E
3030 South Susan St. Page 9 of 15
Santa Ana, CA 92704
www.impcotechnologies.com
3030 S Susan Street, Santa Ana, CA 92704
Ph: +1 714 656 1200 Fax: +1 714 656 1400
6. Push down on the vacuum-lock diaphragm (15)
and hold a finger over the vacuum connection on
the front of the regulator (below “VAC” on the
regulator face). Release the diaphragm and the
diaphragm will stay depressed and down against
the regulator body (2) if there are no leaks. Pull
up on the center of the diaphragm assembly for
further leak inspection. Release your finger
sealing the vacuum port and the diaphragm will
rise with spring pressure. If the diaphragm rises
when the vacuum connection is sealed, a leak
exists. Inspect the diaphragm for tears and the
regulator body (2) for damage. If the diaphragm is
torn, it must be replaced. If damage is found in
the regulator body, the regulator cannot be
serviced and must be replaced.
8. Place a small amount (thin film) of petroleum jelly
(Vaseline) on the surface of the secondary seat.
Install the secondary lever (23), pivot pin (22) and
two screws (31). Tighten screws evenly to 25 in.
lbs. ±5 in. lbs. (2.83 N•m ± 0.57 N•m).
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