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Old 25-04-2017, 19:27   #46
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Re: Avoiding water coming in through exhaust (hydrolock)

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Originally Posted by Jim Cate View Post
given that this combination of design and material will fail without flushing, sure, better than none!

But, I believe that other combinations of design and material exist which do not requir this treatment, and that they would be a better choice, at least for me.

I've owned inboard powered yachts for the past 40 years now, and have never once flushed my exhaust cooling system. I have once replaced an OEM exhaust fitting (on a BMW D-35) with a stainless one that I fabricated myself. That one, as well as the other OEM ones, lasted thousands of hours in total. I believe this to be a reasonable expectation for a marine engine. YMMV.

Jim

I'm sure. However in maintaining a 1/2 freshwater cooled system, as wingless is eluding to, a freshwater flush and drain can't hurt. It's a v-drive installation, engines close to the transom. In this case, using a log style or crusader style exhaust manifold may put the riser outlet below the spillway safety margin. And push the riser outlet closer to the transom. So they are using center-riser exhaust manifolds. A full freshwater cooled system will limit the flush/drain to the risers only at the raw water injection location. Might be worth researching.
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