866 Challenger Series |
11
www.natvac.com | 800.253.5500
Oil Pump Flow Rate Adjustment Procedures
1. Remove oil pump cap (3/32 hex).
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Ensure o-ring stays intact.
3/32 Hex
2. Move cam so adjustment screws
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are resting on lower flats
Upper Flat
Lower Flat
3. Hold adjustment screw (9/64 hex or flat
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head screw) while loosening jam nut
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1/4” wrench). Spin jam nut all the way
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up to the head.
Adjustment
Screw 9/64
Hex or Flat
Head Screw
Depending
on Unit
Jam Nut
4. Tighten adjustment screw (CW) until
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it seats on the cam. (Do not force!
Seated
Against Flat
of Cam
5. Back the screw off the desired amount
of turns (CCW) - 5 turns if running at
900 RPM
Tip: More turns out equals less oil flow.
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Fewer turns out equals more oil flow.
6. Retighten jam nut while holding
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adjustment screw.
7. Repeat process for other
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adjustment screw.
8. Reassemble cover onto pump
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assuring o-ring does not fall out of
groove, and springs are located over
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adjustment screws
Springs
Located Over
Screws
If oil pump requires further adjustment, the
rule is 1/2 turn CW = 1 oz/ hr higher oil flow.
Jam Nut Tight
Against Piston
O-ring
Seated in
Groove