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The Contessa Corner → Technical → Water in Exhaust
When I repowered with a 1GM10, I installed a waterlock box to stop backwash from getting to the exhaust port. An inexpensive and simple solution. Even with a higher loop, the water that is in the exhaust tube between the engine and the loop can flow back when the engine is stopped.
Peter, you can see the exhaust check valve assembly up underneath the transom coaming...you almost have to use a mirror to find it! So, that is for sure high enough to prevent water from coming in from exhaust port. But, as you can see, the waterlock muffler has to sit in little area near where prop shaft exits boat...and that is NOT very much lower than exhaust elbow.. Of course a higher elbow would be the answer, however, wrong answer, as we have no room in cockpit for that! ;-)
So, always make sure you high end waterlock muffler stays where it should!
And, the exhaust hose is HELL to work with, I had a fight trying to get it back on my muffler, as it was too long and was almost horizontal so I cut some off (hello heavy duty wirecutters, there is heavy duty wire in it too) I tried heat gun but then realized there must be a tool or something to to it, and sure enough, when mechanic came to finish rebuilding, he said: oh yes, we use a tool! And here's me and all 110 lbs of me and my little hands wrestling with this hose, good for a laugh!
AND: if you engine is having a hard time starting for whatever reason: CLOSE the raw water intake so the cooling sea water does not build up in the muffler and then flow back into the elbow! If engine can't start, it can't expel saltwater, so you can be in trouble. Then, the minute it starts, dive like a madman to open the raw water intake....and if you forget, your (should be) habit of looking over the stern to see if water is splooshing out of the exhaust will tell you you forgot something very important!! ;-)
I agree with you that the high loop chamber under the cockpit cowel must not be removed. It is for preventing water from entering the exhaust exit at the stern and getting to the engine. The water lock box I referred to is only for water that came from the injected cooling water. When the engine is stopped or brought to idle, the exhaust is not longer pushing the water up the pipe. It prevents the injected water in the exhaust pipe from flowing back to the engine. Since this is a limited amount of water, the box does not have to be very low or large. I am careful about checking for water coming out the exhaust, but do not trust myself enough to turn off the water valve.
Thanks Guys, I just got the waterlock in from Vetus, my shaft is being machined right now, hopefully in the water in a couple of weeks...
I am installing a Yanmar 1GM10 and my mechanic is worried about backflow of water into the original exhaust, because of the relatively small elbow. He wants to lower the exhaust through hull to create a higher loop. Has anyone had problems with the original setup?
Thanks,
Peter
The Contessa Corner → Technical → Water in Exhaust
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