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simplewrench

7117 oil in the air filter

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simplewrench

I Have my son in laws 7117 and it is getting the oil up in the air filter from the breather like the kt series likes to do and I have been unsuccessful in trying to find any articles addressing this issue. I know I have read about it on here before. My main question is which of the 2 types of breather do we want in the unit. I remember there being a reed type and another but forgot which works best. Thanks Tom

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Brettw

The reed type is the new replacement.  They are available on e-bay for about 30 bux. However, I would verify the old one has failed.  A lot of oil in the air filter may be a symptom of other issues, too much back pressure from bad rings, overfull oil possibly from fuel, etc.

Edited by Brettw

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simplewrench

There is no smoke from the exhaust to suggest bad rings. And there is over 90 psi compression. Could the rings still be a concern? The oil was low to start with and I brought it up to full. 

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MikeES

Also a plugged air filter will suck oil pass the breather.   Plugged air filter will create too low of a pressure on the clean side of the air filter, and too low a pressure for the breather to work correct, especially the old umbrella breathers. 

I also have a KT17 with too much blowby, even with 90psi.   I had to vent the breather to atmosphere or it would suck/push a lot of oil into the intake.   It was using about 1/2 qt to mow the lawn.   I vented the breather out to the open and it doesn't use any oil.   And BTW it did not smoke at all.  The KT is now in queue for new rings.

You can try the rubber glove test.   If you think the breather is good, take off the oil fill cap and put a rubber glove over it, start the engine and see how fast it blows up.   An engine will lots of blowby will blow up the glove in a few seconds.   A good engine will not blow up the glove at all.   I believe that test is from Al Eden.

Edited by MikeES
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simplewrench

Thanks for the tip on the rubber glove test. Hadn't heard of that one before. Hope to get into it this week. Been helping my daughter and son in law get their house ready to put on the market. 

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