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2 stroke enthusiast
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Discussion Starter · #1 ·
A buddy at work recently picked up a nice Power King tractor of the '78 vintage. He tells me it's an 18hp Kohler which I believe may be a K361? Not too sure or familiar with the older cast Kohlers. Anyway, even though this machine was well maintained, he was talking to another fella who sold these models, and was informed about how these engines would lose the valve guides and push the valves up through the head.
He is a bit worried about the possibility of this happening, but I gave him some PM measures to go through including starting the use of Marvel Mystery oil in his fuel. Can anyone give me some details or info about this problem?
:thanku:
 

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Certified Technician
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8,538 Posts
Common problem with the K361.

The K361 was essentially a flathead block, modified to accept an aluminum OHV head.

These things had a head problem, but not so much a guide problem as a seat problem. The exhaust seat would come loose and hammer out the head, ruining it. Heads are no longer available, and repairing the head is not really psosible as by the time you realize it has happened, the head is ruined.

I used the last head available through Kohler Distributors in the SE region, about 2-3 years ago. Anything left will be NOS sitting on a shelf somewhere.
 

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1,879 Posts
Common problem with the K361.

The K361 was essentially a flathead block, modified to accept an aluminum OHV head.

These things had a head problem, but not so much a guide problem as a seat problem. The exhaust seat would come loose and hammer out the head, ruining it. Heads are no longer available, and repairing the head is not really psosible as by the time you realize it has happened, the head is ruined.

I used the last head available through Kohler Distributors in the SE region, about 2-3 years ago. Anything left will be NOS sitting on a shelf somewhere.
I have had 2 361 heads repaired. Not hard to do. Mill out the old seat area and install a chevy seat and valve. Total cost $100. This guy does it on many of his pulling engines.
 

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Keep the the cooling system free of debris.Those engines are also prone to leaking and oil starts baking on the cooling fins on the head so it is a good idea to pull the tin from time to time and clean the head.
 

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I have had 2 361 heads repaired. Not hard to do. Mill out the old seat area and install a chevy seat and valve. Total cost $100. This guy does it on many of his pulling engines.
Ive never seen one where the head was repairable without extensive rebuilding and filling with TIG, then machining the seat groove and pressing in a new seat...The ones Ive seen were beat into submission.
 
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