Harborite88
New member
1998 7.4 Horizon 380hp in a Sea Ray started to tick then developed into a bit of a knock, the factory oil pressure gauge went from 60 at WOT to less than 40. Here is a video to add some sound to the issue.
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loose rocker arm, bent pushrod, pulled rocker stud, stuck/bent valve
started to tick then developed into a bit of a knock, the factory oil pressure gauge went from 60 at WOT to less than 40.
So next step remove the
Ayuh,..... Next step is to pull the motor, 'n strip it down,....
Sounds more like yer gonna be rebuildin' the bottom end,....
Engines aren't my strong suit, so I'm asking more than suggesting. Are the lifters hyd. to take up slack? If so, could one be bad?
Yeah, they are hyd. roller lifters. A collapsed one could make a noise like this. But, I think usually you would have a really loose rocker on one of the valves that would indicate something like this was happening. Unless I’m missing something, I’m not seeing anything wrong with the valvetrain yet, which sucks. I will keep investigating after I get off shift though.