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Kohler K Acr


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#1 LilysDad OFFLINE  

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Posted April 16, 2013 - 06:04 AM

I have a Kohler K341 that I rebuilt. The first time I tried to start it, the starter wouldn't turn it over. Turning it over by hand, it seems to have an awful lot of compression. Thinking the compression release may be messed up, I'm wondering , if I remove the head and crank it over again, will I be able to tell if the ACR is working by watching the valves? I really don't want to have to tear it apart again!!!



#2 WNYTractorTinkerer ONLINE  

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Posted April 16, 2013 - 06:53 AM

Watch the piston and the intake valve..  Rotate the engine and after the exhaust valve closes you will see the intake valve open and the piston travels down pulling fuel/air into the cylinder.  Once the piston gets to the bottom of it's stroke and starts to travel up the intake valve won't fully close for part of the piston's up stroke.  That is the ACR..  It lowers the compression created in the cylinder that way..  You can also watch the valve action behind the crankcase breather as long as you know where on the flywheel TDC is.  Make sure you rotate the engine in the correct direction..


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#3 achomesteader OFFLINE  

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Posted April 16, 2013 - 08:59 AM

From the K Series Service Manual:

 

acr.jpg


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#4 JDBrian OFFLINE  

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Posted April 16, 2013 - 10:27 AM

I think you could see it by just removing the valve cover and watching the intake valve. I remember seeing it operate on my 321. That way you don't have to pull the head.  


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#5 Arti OFFLINE  

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Posted April 16, 2013 - 11:30 AM

Why not just take the spark plug out and see if the starter turns it over... If it does then I'd start looking at the acr.


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