Home › Forum › Ask A Member › QD19 Overheat Question – Update › Re: Question For The OMC Experts
The spent water relief hole into the mid/exhaust cavity isn’t plugged. It seems strange that after even a short run on plane the shift lever cools right down, but the upper mid doesn’t. it’s not even like the motor sits low in the water at idle, making it hard for the exhaust to get down the mid.
Chris, seems to me – why drill a hole in the water tube when a hole in the spent water tube does the same thing, without affecting the incoming water.
The relief hole in the spent water cavity is more like an overflow, it comes out inside the mid at the same level as the spent water exits to the outside, about 7.5" above the mid & L/U mating surface. So any exhaust has to travel back up the relief hole to mix with the spent water.
I do know someone at a marina who might have access to the OMC service bulletins. You know what really sucks about all this, I wanted to have these two 10hp motors done about a month ago, before I put my MK50 on the boat, since it’s all I can do to lift it.