Important

Before refilling oil tank, thoroughly flush and clean tank with kerosene to remove any foreign material that may have fallen into tank.

ENGINE OILING AND BREATHER SYSTEM (Fig. 3A-6)

1. Gravity feed to oil pump.

2. Feed section of oil pump.

3. Check valve prevents gravity oil drainage from tank to engine. Builds up oil pressure to operate oil signal switch.

4. Oil is forced through pinion gear shaft to lubricate lower connecting rod bearings from which oil splashes to cylinder walls, piston, piston pin and main bearings.

5. Oil is forced through oil lines to lubricate rocker arm bearings and rods, valve stems, valve springs and push rod sockets.

6. Oil drains from cylinder head through passages in each cylinder, then flows through two holes in the base of each cylinder, lubricating cylinder walls, piston, piston rings and main bearings.

7. Oil flows from the rocker arm boxes into the gearcase compartment, lubricating push rods, tappets, tappet-guides and tappet rollers.

8. Oil accumulated in crankcase base is scavenged by the flywheels to the breather oil trap.

9. The rotary breather valve is timed to open on the downward stroke of pistons, allowing crankcase exhaust air pressure to expel scavenge oil from crankcase breather oil trap into timing gearcase. Breather valve closes on upward stroke of pistons, creating vacuum in crankcase.

10. Oil blown and drained into timing gearcase (steps 7 and 9), lubricates generator drive gear, timing gears and gear shaft bearings.

11. Crankcase exhaust air escapes from timing gear-case through outside breather tube. Any oil still carried by exhaust air is separated from the air by an oil slinger on the generator drive gear.

12. Gearcase oil flows through fine mesh oil strainer preventing foreign particles from entering scavenge section of pump.

13. Scavenge (return) section of oil pump.

14. Engine oil returns to tank and also supplies oil to the rear chain oiler.

15. Vent line from oil tank.

3ms3m3 ;i3>ujr procidurk GENERAL

When an engine needs repair, it is not always possible to definitely determine beforehand whether repair can be made with only cylinder head, cylinders and pistons removed from engine or whether engine must be completely disassembled for crankcase repair.

Most commonly, only cylinder head and cylinder repair is needed (valves, rings, pistons, etc.) and it is recommended procedure to service these units first, allowing engine crankcase to remain in frame. Follow the procedure under "Stripping Motorcycle For Engine Repair," steps 1-5, 7, 24-28, to strip motorcycle for removal of cylinder head, cylinder and pistons.

After disassembling "upper end" only, it may be found that crankcase repair is necessary; this requires removal of engine crankcase from chassis outlined under "Stripping Motorcycle For Engine Repair," steps 6, 8-23, 29-39.

In cases where it has been definitely determined beforehand that crankcase repair is necessary, the engine, completely assembled, should be removed from chassis as outlined under "Stripping Motorcycle For Engine Repair," steps 1-39.

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