I have a 1989 mercruiser GM 3.0 liter , when I started it up It has a loud knock in the bottom of the engine near the middde, as the engine warmed up it went away, but when I put her in the water, same thing, but also knocked when shifting or hard turning, now what??? Thanks...
I have a 1989 mercruiser GM 3.0 liter , when I started it up It has a loud knock in the bottom of the engine near the middde, as the engine warmed up it went away, but when I put her in the water, same thing, but also knocked when shifting or hard turning, now what??? Thanks...
If the knock changes with steering position it's likely u-joints. Outdrive needs to come off for inspection
That makes sense, but what about the bottom end knock at startup idle?? same thing??? Just trying to get a sense of what I am getting into... Thanks...
not good at all take it in your lower unit most likley is going out I used to work at a boat yard a while ago drain you gear lube and see if it's milky and you'll know
Hmmm.. The knocks in the engine, would the outdrive cause that noise in the engine... interesting, ( since I know nothing about this stuff) thanks for the replys..
if its only for a couple seconds it could be running dry until the oil pressure builds up, the straight 6 in my pickup will rattle and knock for a few seconds when I first start it up in the morning till it gets good oil pressure
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1979 gregor 15'-35hp evinrude jet "Pleepleus"
don't think it is in the outdrive. more than likely a rod or main bearing. start the engine and start pulling plug wires one at a time. if the noise goes away when the plug wires are pulled you've found the problem!!
It could possible be a piston pin. I had a knocking in my motor as well and it was a piston pin that seized causing the piston to hit one side of the cylinder wall and scared it all up, now I have a motor that requires over $400 dollars of machine work, do not run at anything more than idle and get it looked at ASAP before it becomes terminal.
Last edited by hottrble911; 05-28-2009 at 10:45 PM.
Reason: misspeled words
This could be your gimbal bearing on the back of the motor, front of the outdrive . My dads boat has this same combo and in 10 years we have replaced this bearing twice due to he moors his boat in saltwater. If this knock gets louder when u turn, good chance that could be it
engine noise
not good at all take it in your lower unit most likley is going out I used to work at a boat yard a while ago drain you gear lube and see if it's milky and you'll know
infinity22
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