Sept, 2019 IMPCO Technologies PPI-68 REV. E
3030 South Susan St. Page 8 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
Series I only (Continue to Step 4 for Series II)
3. Insert the neoprene valve (27) with the cupped or
open side down into the water core plug (29) and
press all the way in until it contacts the back of the
relief plug. Apply Loctite 567 or equivalent sealer
on the threads of the relief plug, then slide the
copper gasket (28) over the relief plug and insert
the plug assembly into the regulator body (2).
Torque to 25 ±5 ft. lbs. (33.9 ± 6.8 N•m).
Vacuum Lock Models Only (Skip to Step 7 for
models without a Vacuum Lock):
4. Place the vacuum lock spring (16) into the recess
of the regulator body (2).
5. Place vacuum lock diaphragm (15) on top of
spring (16), and position so the wide edge of the
gasket is seated on the bottom (6 o’clock) position
of the regulator body (2), while making sure the
spring is properly seated over the diaphragm
spring perch. Place the vacuum lock ring (20)
over the diaphragm (15) rotating it to the same
position as the diaphragm and align with screw
holes. Insert four screws (19) and tighten evenly
to 25 in. lbs. ±5 in. lbs. (2.825 N•m ± 0.565 N•m).
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