Home › Forum › Ask A Member › 9.9/15HP T-stat gasket PN? Not on M.E. › Re: 9.9/15HP T-stat gasket PN? Not on M.E.
We used to use the middle gasket in place of the left gasket all the time. Like you, we were confused at first; but there was really no other way out. If the surfaces are true and you use a thin coating of perfect seal, there really shouldn’t be a problem. We never had one. Like Fleetwin says, if you just trim off that extra hole on the bottom right, it is then really the same gasket. If it leaks, it’s because someone wasn’t careful cleaning it up or the motor over heated and the parts warped. (I mean, not to say that 9.9s and 15s over heat much, but…..Lol. In salt water, what one has NOT overheated?) If you keep using the old heads, you invite a leak at the bottom from the old design, without that extra bolt. No doubt that’s why they changed that part of the head design….
As for the Sierra 18-2905-9, I could have sworn that the dash nine just meant it was the same gasket sold in a bulk quantity, like five or ten of them, or something. Correct me if I am wrong about that….
Long live American manufacturing!