12
| 304 Challenger
Series
Oil Pump Flow Rate Adjustment Procedures
1� Remove oil pump cap (3/32 hex)�
Ensure o-ring stays intact�
3/32 Hex
2� Move cam so adjustment screws
are resting on lower flats
Upper Flat
Lower Flat
3. Hold adjustment screw (9/64 hex or flat
head screw) while loosening jam nut
1/4” wrench)� Spin jam nut all the way
up to the head�
Adjustment
Screw 9/64
Hex or Flat
Head Screw
Depending
on Unit
Jam Nut
4� Tighten adjustment screw (CW) until
it seats on the cam� (Do not force!)
Seated
Against Flat
of Cam
5� Back the screw off the desired amount
of turns (CCW)�
Tip: More turns out equals less oil flow.
Fewer turns out equals more oil flow.
6� Retighten jam nut while holding
adjustment screw�
7� Repeat process for other
adjustment screw�
8� Reassemble cover onto pump
assuring o-ring does not fall out of
groove, and springs are located over
adjustment screws
Springs
Located Over
Screws
Jam Nut
Tight Against
Piston
O-ring
Seated in
Groove
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