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- bud37
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Re: Coolant Loss Mystery
- km1125
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Re: Coolant Loss Mystery
Time to do a pressure test!! If you're using a polypropylene glycol based coolant rather then ethylene glycol, you might not notice that "sweet smell" in the exhaust.
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- Vessel Info: 1998 Carver 355
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Re: Coolant Loss Mystery
- km1125
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Re: Coolant Loss Mystery
tomschauer wrote:Source of the post or the tranny exchanger.
If it's the tranny exchanger, wouldn't the tranny be full of water by now?
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Re: Coolant Loss Mystery
- km1125
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Re: Coolant Loss Mystery
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Re: Coolant Loss Mystery
- bud37
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Re: Coolant Loss Mystery
I wonder if one were to get a sample of the exhaust discharge water, could that be tested for engine coolant ( anti freeze )??
- km1125
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Re: Coolant Loss Mystery
bud37 wrote:Source of the post The pressure in the engine coolant would be far higher than the raw water side, there may be some incidental pressure but it would not overcome a leak from the engine side IMO . Actually there may be another potential leak point in the exhaust manifolds if they have engine coolant passages in them with this being closed cooling......just some ideas, I also think there will have to be some pressure testing done.
I wonder if one were to get a sample of the exhaust discharge water, could that be tested for engine coolant ( anti freeze )??
The coolant side will only have pressure from heating up... once that leaks off there's no more pressure unless you're hitting the boiling point. The raw water side should have at least 5psi, shouldn't it?
Perhaps the "best" place for there to be a problem would be the block-off plates between the manifold and riser. This would be the easiest fix. A pressure test would tell you though... you might even be able to hear it leaking. You should be able to isolate the manifold pretty easy to to test each one individually.
- bud37
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Re: Coolant Loss Mystery
nautiyachti wrote:Source of the post I have an 06 Carver with twin 8.1 Liter (496's) engines. I recently noticed my port engine coolant reservoir was empty so I filled it (1 jug) ran the boat for around an hour and it is empty again. The mystery is that the engine is not showing signs of over heating, no coolant in the bilge, no white exhaust smoke indicating it's being burned off? I'm stumped. Sure I could be losing it out the heat exchanger but wouldn't I be overheating?
Here could be a good read, some diagrams and testing procedures for you, maybe not the same engines as yours but I believe the theory is the same.....
http://www.boatfix.com/merc/servmanl/18/18b6r2.pdf
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