AC 5015 Repair Question

iceburg5555

New User
Hello everyone.

I bought an AC 5015 last year. Im having a problem where every 20-30 of running I get what I think is valve float and a significant increase in valve noise, loss of power, excessive smoking. Does not appear to be temperature related.

I have replaced the head (including valve job), pistons, rings, rod bearings, gaskets. I definitely have an increase in power and compression but I still have the valve problem described above.

I was going to pull the cam and tappets which have not been inspected. I wanted to know if people agree/disagree with this next step.

Thanks
 
Maybe a lifter floating and it could be a scar or something on it thats hanging and not falling back down on the cam,just a guess but you've gone thru most everything else.
 

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