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In Reply to: Re: John Deere 425 blown gasket posted by bontai Joe on Wednesday, October 28, 2009:
OK, so I pulled the valve cover off and noticed that the push rod for the intake valve was not connected to the rocker arm. When I pulled the rod out it was bent at about a 45 degree angle. I pushed down on the exhaust valve and it moved easily, but when i tried to push the intake valve, it was stuck. I tapped it gently and was able to push it down. So I replaced the push rod and ran it again. No difference, so I took the valve cover off and had bent the intake push rod once again. This time I pulled the head off and both valves had a good amount of carbon on it. I assume the push rod is bending because it is not able to push the valve open. Is there anything else that would cause this?
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