I got the boat wet and running for the first time today. After getting it fired up it has a distinct "knock" when you rev it up or it revs down. It is louder than a rod knock, this sounds like a diesel idling (slowly). I took off the PTO cover and it seemed like it was coming from that area. U joints maybe? Is there anything in the pump that could make that noise? I was thinking maybe a sloppy fit between the PTO spline and the shaft spline maybe? Is there a spec for spline backlash?
Also I went to set the pressure on the cooling water bypass/relief valve, but the mechanical gage I have on the engine never moved off 0 psi? There was definitely water running, the hoses were getting hot. I am running logs/snails and didnt see the pressure gage move at all.
Thoughts on those items?