Last trip out as I was getting up on plane, I hear some constant loud knocking coming from the rear of the boat, sounded like engine was letting go. Good oil pressure and temperature. Removed valve covers, cut oil filter, nothing...clean, plugs good as well. Still not saying I don't have an engine going south but thought I'd take a look at the drive line before pulling it.
My question is; how many bolts connect the u joint to the flexplate? There are three in a triangle pattern but I'm seeing a 4th hole with nothing in it. Wondering if that empty hole is for a universal set up or have I sheared a bolt?
Another question, if in fact this noise is coming from the u joint, would grease alone correct that? I have also greased the zerk at the pump/yoke.
No trash in the pump looking down the inspection hole however, I haven't had time to remove the grate to check for shaft play....that's job next.