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Tractor Talk Discussion Forum

Kohler Magnum 20 Horse

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Matt

06-12-2004 04:41:53




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My brother and I are in the process of rebuilding a Kohler 20 horse Magnum for my Simplicity Lawn Tractor. After clearancing the valve lash. We turned the engine over by hand and there is a slight ticking sound. On cylinder 2. When the exhaust valve closes it ticks and when the intake just opens it ticks.
We unhooked the springs and keepers to eliminate some possibilities and when we did that. It quit ticking. Honestly saying. I can't remember if it did this before I tore it apart or not.

My question is this... Anyone ever come across the same problem?
And if so... What was done to fix it?
If it's nothing more than a minor annoyance as noise goes. I can live with that. If it's serious. Then I will get it fixed.

Thanks in Advance -Matt-

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JD790

06-12-2004 08:48:32




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 Re: Kohler Magnum 20 Horse in reply to Matt, 06-12-2004 04:41:53  
Sounds like a Compression release Working.
Makes for easier cranking.

I know there OHV engines worked that way.



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Bob

06-12-2004 12:52:25




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 Re: Re: Kohler Magnum 20 Horse in reply to JD790, 06-12-2004 08:48:32  
There's NO automatic compression release on this horizontal opposed twin engine. You are thinking of the 1-cylinder "K" series engines.



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Matt

06-12-2004 12:01:43




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 Re: Re: Kohler Magnum 20 Horse in reply to JD790, 06-12-2004 08:48:32  
Ok. That sounds logical.
Explain something to me though. What does an automatic compression release look like?
I read somewhere that it is built into the camshaft. But. I didn't see anything.
I have a cam, tappet, valve and valve spring with keepers.
Is the automatic compression release something designed into the cam profile? If so. Then it would be RPM sensitive if I am correct. When I first heard the tick. I was like. Ohh great. A rod bearing or something.
*sigh* Anyway. TIA -Matt-

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