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post #1 of 7 Old 06-06-2010 Thread Starter
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alternative to replacing stuck engine zinc

I have a very old Yanmar YC diesel engine on my 30 foot Yamaha 30C sailboat. The bolt that the zinc is attached to is stuck and the head is a bit worn so I can really get a good grip anymore. I could remove the entire cover of the cooling water compartment to get to the zinc that that would probably mean replacing the gasket as well which they might not make anymore.

I have zincs on the prop shaft which theoretically is in contact with the same water that's running thru the engine system. Does the prop zinc have any effect on engine corrosion? Is there an alternative to replacing the engine zinc in order to prevent corrosion? Maybe somehow connecting the engine via wire to the keel or close to the prop shaft?

Thanks in advance for your suggestions.

Paul
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post #2 of 7 Old 06-06-2010
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The prop shaft zincs are there to protect primarily the prop. The engine zinc is for the engine internals, one does nothing for the other.

Soak the offending part with PB blaster or another penetrating loosener for a few days and have another go at it. If there's enough room for a small pipe wrench that may well grip things well enough to remove it. Otherwise there are other specialty tools that are designed for such situations.

If this zinc hasn't been changed in some time, it's likely gone and this should be taken care of sooner rather than later.

Ron

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post #3 of 7 Old 06-06-2010
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A small pipe wrench has saved my bacon in these types of situations in the past. I have one that's about 4 inches long, and it's one of the first tools I throw in the summer traveling tool box. It's small enough to get into places where an ordinary wrench can go, but it will grip a bolt head no matter how rounded the corners are.

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Last edited by erps; 06-06-2010 at 10:41 AM.
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post #4 of 7 Old 06-07-2010 Thread Starter
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Thanks for the suggestions! I got a small pipe wrench but still could not wiggle the nut loose. I guess there is no alternative to taking apart the head part and trying to get a gasket from Yanmar.
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post #5 of 7 Old 04-06-2011
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Quote:
Originally Posted by sweetdreamyamaha View Post
Thanks for the suggestions! I got a small pipe wrench but still could not wiggle the nut loose. I guess there is no alternative to taking apart the head part and trying to get a gasket from Yanmar.
Did you finally get the zinc out? I had the same problem on my Yanmar. The thing that worked was heating the bolt head with a propane torch and using a bolt extractor from Bolt Extractors - Screw & Bolt Extractors - Tools - IRWIN TOOLS

The extracotor worked great. I used 15/16 inch which maches I believe the 24 mm yanmar anode plug. I used a 3/8 socket wrech with a 2 foot steel pipe cheater bar. Heat the plug to say 160 degrees and then while it is hot try to remove. Make sure no fuel oil or grease on the engine before applying the flame. I removed the fuel pump, filter and nearby hoses to prevent fire or damage to these items.
Good luck
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post #6 of 7 Old 04-06-2011 Thread Starter
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I got the zinc out by removing the cover. It took a bit of work but I got it out. The bolt is still stuck. Now I've sold that boat and moved on to a different one. I had reservations about heating it because it could crack the cast cover. Thanks for the tip though! Will use it next time I am faced with a stuck bolt.
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post #7 of 7 Old 04-06-2011
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Quote:
Originally Posted by sweetdreamyamaha View Post
I got the zinc out by removing the cover. It took a bit of work but I got it out. The bolt is still stuck. Now I've sold that boat and moved on to a different one. I had reservations about heating it because it could crack the cast cover. Thanks for the tip though! Will use it next time I am faced with a stuck bolt.
I was concerned also about damaging the block (the 2 plugs I removed were in the block). Heating was my last ditch effort as I really wanted to get some zincs in the block to protect the direct sea water cooled engine. I was told by some to clip a zinc fish to the engine and drop in the water, but after further research the zinc needs to be in the block to protect. As it turned out the propane torch did not even damage the original engine paint. I ended up installing new yanmar zinc plugs and they have some kind of thread sealant on them from the factory. I think over time this hardens and acts as a thread locker if the zincs are not changed regularly- this makes it hard to remove the plug- it seems the heat softened this enough to remove the plug. I put a lot of anti-sieze on the plug so furture removal should be easy.
Happy sailing
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