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Go Back   SailNet Community > On Board > Gear & Maintenance > Engines > Diesel
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  #1  
Old 06-17-2014
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no water output at exhaust

I don't have any water coming out my exhaust all of a sudden? It is 'raw' water cooled sb8 Yanmar Diesel. I took the hose loose at the ball valve and water poured in. Cleaned the strainer, checked the impeller, nothing broken, it's soft, this just happened, any ideas where to look next? Thanks.
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Old 06-17-2014
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Re: no water output at exhaust

Either the impeller is bad, could look ok but spun on hub, or there is a blockage up stream from the impeller. On a raw water engine this could be scale. Try back flushing the engine w/ a hose.
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Re: no water output at exhaust

A split in the exaust hose is another option....not as common tho
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Re: no water output at exhaust

Quote:
Originally Posted by jimrafford View Post
Either the impeller is bad, could look ok but spun on hub, or there is a blockage up stream from the impeller. On a raw water engine this could be scale. Try back flushing the engine w/ a hose.
Jim
I'm no mechanic, but couldn't the blockage be downstream as well? I'd double check your impeller to make sure it is mated to the shaft.
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Old 06-17-2014
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Re: no water output at exhaust

Check where the water enters the exhaust elbow. Corrosion and salt deposits often clog the little port. Usually it's easier to just replace the elbow than to try cleaning it out and rehabbing it, since by the time it gets clogged up the corrosion is pretty well advanced.
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Re: no water output at exhaust

This is going to very sound silly...but before you tear things apart..squirt some dawn dish detergent into the line ahead of the impeller, maybe at the strainer for you.

That happened to me once...for no apparent reason. I checked every possible cause to no avail. My boat neighbor said " squirt some dawn in thar" and it worked..I suddenly had plenty of flow..and suds coming out the exhaust. Don't ask me why it works..I'm guessing it adds a little lubrication to the impeller and helps creates better suction. Once I did that, I was fine all season. If that doesn't work..go to plan B
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Old 06-17-2014
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Re: no water output at exhaust

Did you actually check for water making it as far as the pump?
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Re: no water output at exhaust

Thanks all, I am going to try them all, something has to work.
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Old 06-18-2014
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Re: no water output at exhaust

Basically two choices - pump not pumping or a blockage. Just go step by step through the system. Since this happened suddenly and you say the pump looks good, I would lean towards a blockage.
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Old 06-18-2014
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Re: no water output at exhaust

Also check exhaust manifold for release of 'slab rust' which easily migrates to and blocks the exit ports of a failing manifold. To check, remove and invert the manifold and 'shake it'. (note- once an exhaust manifold begins to develop 'slab rust' the potential becomes very great that there will also be a 'pin hole' develop between the 'gas side' and 'the water side' of the manifold ... and water then can easily 'backfill' into a cylinder)

Also check the water pump for integrity of the CAM that the impeller 'rides against'; PLUS, wear that can occur on the internal SIDES of raw water pump ... as if the pump internal sides are severely worn the pump will not develop 'suction' as the leakage will be across the sides of the impeller vanes ----- although usually a slow process of the loss of pump efficiency. You'll need a micrometer and OEM spec. dimensions to do this. In a pinch, the impeller should be 'slightly larger' in width than the housing space it fits into.

Also check for previously lost/broken pump vanes that migrated 'downstream'.

Last edited by RichH; 06-18-2014 at 01:40 PM.
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