1992 john deere 425

   / 1992 john deere 425 #1  

Loganjohndeere425

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Joined
May 16, 2022
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Tractor
92 John deere 425
Started her up this afternoon heard a snap and lost compression on the right cylinder. Pulled the valve cover and rockers aren't moving but left side has loads of compression? What could be the cause??
 
   / 1992 john deere 425 #2  
Plastic cam gears are a known failure point on certain years and models of the Kawasaki engines used in Deeres. Hopefully that snap wasn't piston hitting a valve.
 
   / 1992 john deere 425 #3  
My JD 285 had the plastic cam gear fail. It was when starting the engine (engine failed to start). Mine lost 7 teeth in row on the plastic cam gear, so the cam was no longer rotating when I cranked the engine. IIRC these engines are ones the valves do not hit the pistons.
 

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