Latest Ohv Oil Pump

The oil pump used on later 1952 model O.H.V. engines differs somewhat in construction from the earlier pump, although as complete units they are interchangeable.

The valves have been redesigned to effect more positive seating.

Only the latest pump is now supplied for parts order requirements for 1948 and later engines.

The later pump has no provision for readjusting oil pressure, this being predetermined in design. Maximum pressure is about the same as with the earlier pump.

1. Check Valve-same as item 3 (Part No. 26400-52A)

A Check Valve Spring (Part No. 26363-36)

3. Regulating Valve - , , -adjustable-see item 1

4. Regulating Valve Spr (Part No. 26374-52)

7. Front Chain Oiler Adjusting Screw ^ Sold as kit

9 FrTl rt™ ? " ^!ust!n« Lock Nut ^art No. in o . •aiD, J1" Adiustl°g Screw Washer J26383-32

10. Regu ating Valve Guide-same as item 11 (Part No. 26423-52A)

11. Check Valve Guide-see item 10 "o.

— Maximum Pressure Regulating Valve-Spring adjustment determines pressure at which by-passing r occurs at high engine speed, (about 30 lbs.)

— Maximum Pressure Regulating Valve-Spring adjustment determines pressure at which by-passing r occurs at high engine speed, (about 30 lbs.)

Oil Feed Pump

Gears (Narrow)

Scavenge (Return) Oil From Engine

Scavenger (Return) Oil Pump Gears (Wide)

By-Pass Oil Direct to Timing ^Gear Case

Oil under pressure to engine— pressure depends on engine speed and setting of Pressure Regulating Valve.

Check Valve—To prevent leakage when engine is not running. Opens under about 114 lbs. pressure.

Front Chain Oiler Adjusting Screw

Oil Feed Pump

Gears (Narrow)

Centrifugal Valve—By-passes oil at low and intermediate speeds —and thus at lower speeds limits to low poundage the pressure on oil to engine. As the valve closes tighter at high speeds, pressure gradually builds up to poundage at which the Pressure Regulating Valve is set to open and by-pass oil.

Scavenge (Return) Oil From Engine

Scavenger (Return) Oil Pump Gears (Wide)

SCHEMATIC DIAGRAM OF OIL PUMP FOR 1948 61" & 74" O.H.V. MODELS.

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