Sept, 2019 IMPCO Technologies PPI-68 REV. E
3030 South Susan St. Page 12 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
15. Install the primary pressure spring (5) and screw in
the spring retainer (6) about four turns.
16. Remove plug (1) in the primary test port and insert
a 1/8” NPT to hose barb adapter and attach a
pressure gauge to test port.* SLOWLY turn on air
pressure to 90-100 psi (621-689kPa) and using a
screwdriver, adjust the spring retainer (6) until the
primary pressure is between 4 and 5 psi (27.6-
34.5 kPa).
NOTE: Hose barb and pressure gauges are
included IMPCO ITK test kits.
17. Test the primary diaphragm (3) by plugging the
breather vent (the small 1/8˝ or 3.1mm diameter
hole in the regulator body (2) located near the top
and right side of the secondary lever. Using the
eraser end of a pencil, block or plug the vent and
observe the primary pressure. The pressure
should not change. If the pressure increases, the
primary pressure seat or diaphragm is not sealing
properly and leaking. In this case, the rebuild has
failed and the regulator must be replaced.
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