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Brackish water ops

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ultrarunner View Drop Down
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    Posted: January-10-2020 at 1:44pm
Hey folks, looking at a couple of boats in FL. Have been told use is on brackish water. Boats have a flush sys. installed. 94 and 95 SN's. New manifolds in the last 3 years. One is a GT-40 boat.

Likely will have a friend check them out. He know's boats.

Naturally, I'm inclined to stay away from a salt-water, boat, but having operated blue-water OB's on the salt, it is about care.

Anything specific on a PPI that we wouldn't already do, like leak check, etc...?

Thanks,

Ultra.
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Gary S View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Gary S Quote  Post ReplyReply Direct Link To This Post Posted: January-10-2020 at 2:55pm
PCM manifolds last from 5-7 years with flushing on pure saltwater boats. You will probably be ok on those with them having 3 but once in fresh water they might not last as long if you just replaced them. Luckily those are easy to get. Other parts affected first are the thermostat housings,the upper going first. The water gets under the hose where it clamps on and gets trapped ,no amount of flushing ever gets all the salt out,the cast iron seems to let the salt get into the pore's of the metal as well. If your friend could pull a manifold hose off and take a look that would help. If he can't do that just check around the outsides where the gaskets meet,if rust is showing there it will be worse inside.
Here is an extreme example of what happens. This was a pure salt intake manifold,don't know it's history as to age,if ever flushed etc. But here your looking at a water passage by #1 cylinder,thermostat housing bolts up to the right. The threaded boss you see in the port is where the temp sender locates. You can see around the port what the salt does. I ended up throwing it away,hugh chunks were flaking off inside and because I did not trust it leaking around the gasket surface and either getting into the engine or leaking out of it.   
I don't want to scare you off just want to hopefully help you see what to look for. If it has been cared for you will know just by looking at it.

69 Mustang HM SS
95 Nautique Super Sport
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ultrarunner View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote ultrarunner Quote  Post ReplyReply Direct Link To This Post Posted: January-10-2020 at 10:17pm
Thanks for the good intel Gary.
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