Universal M-18 Heat Exchanger - Page 2 - SailNet Community
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post #11 of 18 Old 12-07-2012
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Re: Universal M-18 Heat Exchanger

Well I think someone got creative after stripping those threads. But the simple fact is, if a zinc anode isn't corroding, the HX is instead. My suggestion is to drill, tap the thread, install a proper zinc.

I found that my chandler stocks all the common zincs so ideally you should take your HX down there to make sure you get one that fits.

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post #12 of 18 Old 12-07-2012
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Re: Universal M-18 Heat Exchanger

Yup, don't reinstall it without a zinc. HXs are expensive. Zincs aren't.

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post #13 of 18 Old 11-17-2013
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Re: Universal M-18 Heat Exchanger

I used to have a C27 with a M18 engine and I have a heat exchanger still in the box I never got to install before I sold it. Willing to offer a great price. It's taking up room in my closet. email tjhaibach AT G Mail dot com.

Tim Haibach
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post #14 of 18 Old 05-24-2014
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Re: Universal M-18 Heat Exchanger

I removed my heat exchanger drain / plug bolt to check the zinc, and coolant flowed out when I was expecting sea water. Is the M-18 hx drain plug on the engine's right side (looking aft) facing down contain coolant or sea water? if coolant is there another zinc bolt?
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post #15 of 18 Old 05-24-2014
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Re: Universal M-18 Heat Exchanger

Tim you still have the M-18 heat exchanger, and still wont to sale it?
let me know thanks
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post #16 of 18 Old 05-25-2014
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Re: Universal M-18 Heat Exchanger

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Originally Posted by martywalters View Post
I removed my heat exchanger drain / plug bolt to check the zinc, and coolant flowed out when I was expecting sea water. Is the M-18 hx drain plug on the engine's right side (looking aft) facing down contain coolant or sea water? if coolant is there another zinc bolt?
The zinc anode should definitely be on the raw water side not the coolant side. I have an m25xp and the zinc on its heat exchanger is exactly where you describe the one on yours.

The brass bolt you remove, is it made to hold a zinc? If so there is some reason you are getting coolant in the raw water side. How is the coolant level? Are you getting coolant in the exhaust discharge?
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post #17 of 18 Old 05-25-2014
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Re: Universal M-18 Heat Exchanger

The last time I ran into coolant in the salt water side, the heat ex was toast.
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post #18 of 18 Old 05-25-2014
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Re: Universal M-18 Heat Exchanger

Previous owner installed a non standard HX that works fine but doesn't have zinc bolt. In fact the drain bolt doesn't have an attachment for the zinc to thread in, its just a solid copper bolt ( see attached photos.)
I'm probably going to get a standard HX for my M-18, so I can include zinc in the system and shorten up the hoses.
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