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way to test crankcase reed valve


 
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tractorguy2
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PostPosted: Thu Oct 22, 2020 6:03 pm    Post subject: way to test crankcase reed valve Reply to specific post Reply with quote

I have a 2019 Toro 32" zero turn with a Toro 14hp engine. I think the reed valve in the crank case vent is leaking. Is there a way to test the reed valve to see if it's leaking.

I'm finding a small amount of engine oil inside the air filter housing. Also oil in the vent hose to the air filter.
 
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wore out
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PostPosted: Thu Oct 22, 2020 7:25 pm    Post subject: Re: way to test crankcase reed valve Reply to specific post Reply with quote

I don't know about your specific engine, or if it even has a reed valve in the crankcase breather, but in general reed valves in breathers stop air from flowing into the crankcase as the piston rises causing a negative pressure in the crankcase.

This doesn't stop oil mist/blowby from reaching the air filter area, but DOES keep a bit of a negative pressure in the crankcase to keep oil from trying to blow past the crank seals and the governor mechanism exiting the crankcase, etc..

There should be a "horsehair" pad in the breather to catch some of any oil vapor exiting the engine, if that's in place there's not much more you can do, sounds like your engine has some "blowby".
 
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tractorguy2
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PostPosted: Fri Oct 23, 2020 6:28 am    Post subject: Re: way to test crankcase reed valve Reply to specific post Reply with quote

The parts listing only shows the reed valve and gasket. No horse hair shown in the diagram.
I assumed if it had any. It would list the part number.
 
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T.R.K.
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PostPosted: Fri Oct 23, 2020 5:01 pm    Post subject: Re: way to test crankcase reed valve Reply to specific post Reply with quote

Check for gas in your oil. Back in the Spring, We had an almost brand new Toro that put enough gas in the crankcase to foul the air filter the first week it was in service.

A new fuel pump fixed that one.

Gas in the crankcase could also be caused by a leaking carburetor needle valve. They sometimes leak gas into the engine while the engine is stored.

To answer your question about testing the reed valve: You can check for crankcase vacuum with a water manometer or an equivalent gauge. I just don't know what the minmim vacuum specification is for those Toro engines.

For some Kohler engines its 4 inches or more (water)
For most Briggs its 10inches or more.
For most Kawasaki its 14 inches or more.

Please note: A low number on the manometer can also indicate a worn engine or a blown case gasket or seal.
 
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Mule Meat
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PostPosted: Mon Oct 26, 2020 9:53 am    Post subject: Re: way to test crankcase reed valve Reply to specific post Reply with quote

Honestly do not think that your engine has a Reed Valve in the crankcase breather. A reed valve works the same as a one way valve. Thus depending on which way it opens. If the engine draws air in but not let it out. You will have excessive crank case pressure causing the engine smoke and or oil being blown out of the dip stick. If it only allowed air to escape. Then a vacuum would be created in the crank case causing the engine to lose oil through the air cleaner and engine oil to bypass the rings and valve seals.

Your condition can most likely be traced to a dirty airfilter, oil level to high, worn piston or rings, valves out of adjustment or worn guides.
 
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kencombs
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PostPosted: Mon Oct 26, 2020 2:38 pm    Post subject: Re: way to test crankcase reed valve Reply to specific post Reply with quote

It does have a reed valve. I think it is a Loncin with the Toro name on it. If so, I found a parts manual on line that shows the valve. Most small engines have those. Kohler has a spec and procedure to test crankcase vacuum. it should never have a positive pressure as oil will be sent to places unintended, out of seals and into the carb or manifold.
.
If you run the test, it will tell you that either the valve is bad or there is excessive blowby. but, it won't tell you which.

A leakdown test and/or a compression test can help with that.
 
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