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  1. J

    MEP803a looses all compression. Lifter Problem?

    Good Job! Did you access the oil pressure relief valve from the front cover or did you take the side cover off?
  2. J

    MEP803a looses all compression. Lifter Problem?

    Take the oil refill cap off or the dipstick out to see if it has back pressure. It could be the piston rings. If you don't have a large amount of back pressure I would say the valves. You are correct, the valves have no adjustment.
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