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tappet lifter

  1. need help!!!! exhaust valve on #6 not working

    Cummins 6BT / 5.9 Conversions
    Hey guy my brother has a 6bt out of a 1997 3500 12 valve. We got to looking at it and #6 exhaust valve is not working. Any ideas? bad tappet lifter or cams gone!?!? Need to get this on the road soon!!