Legend For Illus 22 And 23ohv Engine Oiling And Breather System

A. Feed section of oil pump.

B. Check valve.

C. Maximum oil pressure regulating valve.

D. Governor rotor with centrifugal valve which controls oil pressure at low and intermediate speeds.

E. Front chain oiler adjusting screw.

F. Scavenge section of oil pump.

G. Pinion gear shaft through which oil is forced to connecting rod lower bearings, from which it splashes to cylinder walls, pistons, main bearings, etc.

H. Timed "Rotary" crankcase breather valve. Rotary breather valve is timed to open on downward stroke of pistons, allowing crankcase exhaust air to expel scavenge oil from crankcase into timing gear case. This interval is indicated by arrows ^—. During this interval, the two small ports in breather valve are closed. Rotary breather valve closes on upward stroke of pistons, creating vacuum in crankcase. Dining this interval both small ports in breather valve line up with passages in crankcase. Oil is then retrieved by vacuum from outside breather oil trap (I) in crankcase, and valve spring covers as indicated by arrows . |> > •

J. Outside breather oil trap.

K. Crankcase oil scavenging sump.

-Feed oil from tank to engine. Oil is forced through passages as indicated, to connecting rod lower bearings, and through passages and pipe to rocker arms, push rods, and valve stems.

—► ► > Scavenge oil (return oil) from engine to oil tank. Oil is pumped from engine through passages as indicated.

// > By-pass oil. Surplus oil over and above the volume required to attain the pressure to which pump is adjusted, escapes past pressure regulating valve (C) and, flowing through passage indicated, discharges directly into timing gear case where it lubricates timing, gears .and then .settles into scavenger pump sump from which it is returned to tank.

—>» > Oil retrieved by vacuum. As oil accumulates in valve spring covers and outside breather oil trap (I) in crankcase, it is retrieved by crankcase vacuum through passages and push rod covers as indicated.

,—-f^-^. Scavenge oil and crankcase exhaust air from crankcase sump (K). Exhaust air expels scavenge oil from crankcase, through rotary breather valve (H), into timing gear case where the oil settles into scavenger pump sump and is returned to tank.

Crankcase exhaust air. Escapes from timing gear case through outside breather passage, which terminates in front chain guard. Any oil still carried by exhaust air is trapped in outside breather oil trap (J) and retrieved by vacuum.

—/// > Front chain oil. Oil is bled from by-pass oil for front chain lubrication, through passages indicated which terminate in outside breather passage. Exhaust air delivers oil to chain. Oil is regulated by adjusting screw (E).

Note: Oil to rocker arms and valve stems is metered through a fixed orifice in each rocker arm shaft and no adjustment for more or less oil is provided.

CAUTION: Since oil supplied to overhead fittings is sucked back into crankcase through push rod covers by crankcase vacuum, it is essential that push rod covers and rocker arm housings be well sealed to maintain maximum vacuum and prevent oil leakage. When reassembling push rod covers, make sure that both ends of covers are properly seated against cork washers.


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