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Go Back   SailNet Community > On Board > Gear & Maintenance
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  #11  
Old 11-03-2011
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  #12  
Old 11-03-2011
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Just the answers I was looking for, I have the same problem in a Yanmar 2QM20 I am rebulding. Will try to descale it with oxalic acid.
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Old 11-06-2011
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Rydlyme for Yanmar cooling systems

Rydlyme is the preferred choice for Yanmar cooling systems.
Too strong an acid will eat the exchanger and you'll find yourself with an expensive part to buy.

The heat exchangers found on Perkins,Universal and Westerbekes are much more durable.

However more care is needed on Yanmar Heat Exchangers

I prefer to dissasemble the heat exchanger.
Physically remove all blockage then soak in Rydlyme.
Works every time
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Old 11-06-2011
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Engine corrosion is complex. Look at this: Corrosion in Salt Water Marine Engines
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Old 11-06-2011
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Overheating

Saildrives have a reputation for restricting cooling water flow due to growths
and need to be cleaned out from time to time.
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Old 11-06-2011
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Rydlyme is hydrochloric acid based with added wetting and penetration agents. I will be trying it on my Yanmar in the near future.
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Old 11-07-2011
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RydLyme is a *buffered* hydrdochloric acid. The buffering agent prevents the reduction of the normally formed protective 'black' (ferrous) rust into destructive 'red (ferric) rust ... so that you can descale the carbonate formations ... and with minimal attack of the engine's base metal. Simple speak: RydLyme and other buffered descaling agents remove the 'insoluble salts' but not (much of) the 'metals'. Straight unbuffered HCl will bore through the carbonates, through the 'rust' and into the metal ... and since cast iron is typically a 'stratified' casting (like an onion) once you penetrate one of these 'onion layers' you promote 'slab rust' - large 'plateletts' of ferric rust that can loosen and migrate further into the engine and exhaust manifold and can cause partial or total blocking of the cooling circuit.

Oxalic is 'too weak' an acid to adequately react with the formed carbonates .... the 'reactivity' of oxalic vs. carbonates will require an immense amount of 'oxalic' or 'vinegar' to do the job.
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