Rotary valve and water pump drive oil supply

by Howard Dyer in 2 Stroke Technical Questions 11 years ago

Have a 582 vertical mount.
It seems that when ever I fill the oil tank it just runs down into the crank case and finally the level only stabilizers after about 300 ml. It then seems to weep out of the interface between the coupling housing and crankcase on the under side. This all happens with out running the motor.
Comments would be much appreciated.

Howe

Re: Rotary valve and water pump drive oil supply

by bill martin » 11 years ago

bill martin

10 757 0

Howard,

Is the engine mounted horizontally with plugs up? Is the oil coming out the crankshaft ends or the rotary valve cover?

300ml. is about the proper amount. Is it all leaking out?

Bill.

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Re: Rotary valve and water pump drive oil supply

by Howard Dyer » 11 years ago

Howard Dyer

4 7 0

Bill,

The plugs are on top.
If I pour 2 x tank capacity in and give it an hour, the tank drains and indicates empty. I then open the vent plug on the crank case, about the same amount pours out.
I think ALL the oil in the OIL tank eventually finds it way into the bottom of the crankcase.

No oil comes out of the rotary valve cover.

thanks H

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Re: Rotary valve and water pump drive oil supply

by bill martin » 11 years ago

bill martin

10 757 0

Howard,

If I'm understanding correctly, it sounds like everything is OK. When you put oil into the tank on top of the engine, it immediately goes into the center portion of the crankcase. The crankcase holds holds about 310ml and the hose and oil tank hold a little more. Sometimes it takes a while for the oil to flow down into the crankcase and you may have to add a little oil several times to insure that the crankcase and oil tank are full. Fill the oil tank SLOWLY. If you fill it all the way up rapidly, the oil will cover the top of the air vent inside the tank and not allow the oil to flow down into the crankcase.

First thing to do is check the radiator and see if you have any oil or an oily sheen on the water in the radiator. If the water is clean, check the oil in the crankcase to see if there is any water in the crankcase. Water in the oil will turn the oil into something like a thick chocolate mousse. On Some engines, there is a weep hole into the area between the water pump seal and the rotary shaft oil seal. On newer engines this weep hole was plugged.
If either one of those seals is leaking, and the weep hole is open, water or oil, depending on which seal is bad, will leak out of a small opening just below the water pump right at the seam where the upper and lower crankcase halves meet.

If the seal on the rotary valve side is leaking, it is harder to detect because the oil just leaks into the intake manifold and is burned normally.

If either inner crankshaft seal is leaking, that oil also would be burned along with the fuel. Sometimes that can be seen by heavy smoking for a few minutes after startup.

If your oil is leaking out under the water pump from that tiny opening where the crankcase halves meet, it sound like a bad rotary valve shaft oil seal.

Bill.

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Re: Rotary valve and water pump drive oil supply

by Howard Dyer » 11 years ago

Howard Dyer

4 7 0

Many thanks for the explanation Bill I now get it. I also found the exploded view helpful in the parts manual which I have now downloaded. Could not work out how the sump in the crankcase was totally sealed and not subject to manifold pressure.

thanks again...H

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Rotary valve and water pump drive oil supply

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