Pressure Regulating Valve Chamber Cap Screw Pressure Regulating Valve Adjusting Screw Pressure Regulating Valve Spring Pressure Regulating Valve (same as Items 8 and 16) Oil Feed Pump Body

Check Valve Chamber Cap Screw (same as Item 14) Check Valve Spring (same as Item 15) Check Valve

Oil Feed Pump Mounting Stud Nut Lock Washer

Oil Feed Pump Mounting Cap Screw Oil Feed Pump Mounting Stud Nut Oil Feed Pump Mounting Stud Nut

Check Valve

Oil Feed Pump Rotor

Oil Feed Pump Vane Spring

Oil Feed Pump Vane (same as Item 20)

Oil Feed Pump Gasket Oil Scavenger Pump Screen Breather Valve

Oil Scavenger Pump Gasket (same as Item 31)

Oil Scavenger Pump Body

Oil Scavenger Pump Idler Gear

Oil Scavenger Pump Gear

Oil Scavenger Pump Gear Key

Split Key (same as Item 30)

Oil Scavenger Pump Cover Lock Washer

Oil Scavenger Pump Mounting Stud Nut Oil Scavenger Pump Cover Cap Screw

Servicing Scavenger Pump (Side Valve Engine)

(To Identify Items, Refer to Illus. 57)

The crankcase breather valve (23) is an integral part of the scavenger (oil return) pump. The breather valve (which drives scavenger pump gears) is driven by a spiral gear located on engine pinion gear shaft. Breather valve must be accurately timed to control the scavenging of oil from engine crankcase. A few motorcycles are equipped with rear chain oiler, in which case the scavenger pump provides oil for rear chain lubrication. Breather valve and scavenger pump give very little trouble and ordinarily a thorough cleaning is all the service required.

Thoroughly clean exterior of pump in gasoline or cleaning solvent before disassembling.

Remove the two cover cap screws (35) and separate cover (32) from pump body, exercising care not to damage paper gasket (31). With cover removed, pump gears (26) and (27) are exposed. Pump gear (27) is keyed on breather valve end, and pump idler gear (26) idles on cover stud. Remove the split keys (29) and (30) from end of breather valve, and pump gear is then free for removal.

After pump gears have been removed, remove gear key (28) and pull breather valve out of pump body.

If pump is provided with rear chain oiler, remove adjusting screw and adjusting screw washers so that cover oil channels may be cleaned out.

Clean all parts thoroughly in gasoline or cleaning solvent. Blow out oil holes and passages with air.

Inspect breather valve spiral gear teeth for good condition. Inspect pump body and cover for breaks, cracks, or other damage that requires replacement of these parts.

Any damaged and/or badly worn parts should be replaced. If breather valve is damaged, it is advisable to replace entire unit.

All parts must be thoroughly clean before assembling. Do not install pump until crankcase has been assembled and pinion shaft gears installed, ready for timing.

Apply engine oil to all moving parts before assembling. Install breather valve (23). Install key (28) in keyway in end of breather valve and install pump gear (27), registering keyway with key. Install split keys (29) and (30). If cover gasket (31) is to be replaced do not use other than a "factory-made" gasket. This gasket is special as concerns thickness. Locate gasket on pump body after applying engine oil to face of gasket to hold it in place. Install pump idler gear (26) on cover stud and assemble cover and gear on pump body. Install the two cover cap screws and lock washers but do not tighten screws until after pump has been installed.

If pump is pro /ided with rear chain oiler, make sure that all the oiler adjusting screw washers removed when pump was disassembled, are reinstalled when installing adjusting screw. Final adjustment of rear chain oiler cannot be determined until motorcycle is placed in service. See "Lubricating Drive Chains," Page 12.

Installing Scavenger Pump (Side Valve Engine)

Install gear shaft bearing oil seal ring (32), Illus. 63, on pinion gear shaft. Locate the semi-circular screen (22), Illus. 57, between breather valve housing and crankcase port, before installing scavenger pump. A recess is machined in rear side of crankcase port chamber to accommodate the screen which is held in place by breather valve housing. The breather valve must be timed so the elongated ports in valve sleeve and breather valve housing align at the correct time for proper scavenging of oil from engine crankcase.

See that crankcase and pump body faces are clean and that gasket is in good condition and in place (a light film of oil will hold gasket in place) and install pump. Install washers and nuts on pump mounting studs and securely tighten nuts and cap screws.

After nuts and cap screws have been securely tightened, and before installing gears on pinion gear shaft, make sure pump gears turn with little or no binding. While a very slight bind or drag is permissible, gears should be adjusted to turn as freely as possible. Binding is caused by slight misalignment of cover. If there is more than just noticable bind, loosen mounting stud nuts and cap screws and shift cover as needed using a hammer and block of hard wood, resting wood radially against cover.

It will not be possible to determine before hand in which direction cover must be shifted and it may require several attempts from different angles before alignment is correct.

Time breather valve as per instructions under "Timing Crankcase Breather Valve (Side Valve Engine)."

CAUTION: Breather valve controls the scavenging of oil from crankcase. Unless it is accurately timed as per instructions, oiling system will not function normally.

Timing Crankcase Breather Valve (Side Valve Engine)

(Refer to Illus. 63)

Install oil seal ring spring (33), breather valve and scavenger pump spiral drive gear (34), and pinion gear (35) on pinion shaft in order named. A mark is cut in one side of spiral drive gear. Install with marked side outward (against pinion gear). Now refer to Illus. 58. Item numbers of comparative items differ from those shown in Illus. 63. Turn engine until flywheel timing mark is exactly in center of timing inspection hole in left crankcase. Push gears inward, compressing spring and engage spiral drive gear and breather sleeve gear (6) so hole (4) in sleeve is in center of breather housing slot when pinion gear is set and held with its outer face (3) 7/16" from gear case joint face (this is actual location of pinion and spiral gears on pinion shaft when gear case cover is in place). It may require several

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