Originally Posted by ssmonty
Are you pushing down towards the pump with the drill? There shouldn't be any downward force applied to the oil pump shaft, or the gear attached to it will be forced into the oil pump cover and drag/bind.
Also the engaugement between the priming tool and the pump shaft is not exactly a precise fit that may create some clatter/vibration.
Not pushing down... just the weight of the drill. The priming tool is the type with the valley collar, which I believe would prevent any undue downward pressure on the drive shaft. The drive shaft does not turn smoothly... if I stick a screwdriver on it and turn it slowly by hand, I can feel the shaft kinda jerking in steps rather than being buttery smooth. No other symptoms. I'm starting to think maybe it's normal, but I was just expecting the shaft to turn smoothly.