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Antique Gas Engine Discussion

Cast Iron Crack Repair


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  #1  
Old 01-16-2005, 08:53:08 PM
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Mike Inglis Mike Inglis is offline
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Default Cast Iron Crack Repair

I have a block here that showed 2 or 3 fine cracks when tested, I was told

by a engine rebuilding shop and other people that i should just finely groove

it out and put JB weld in the cracks and then after it is running to run some

stop leak in it. By the looks of them, it should work.....I am just wondering if

there is any product similar but better than JB Weld i should use, or should i

send it out for repairs or try finding a new block?

Thanks
Mike
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  #2  
Old 01-16-2005, 09:27:36 PM
Chip Watford Chip Watford is offline
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Default Re: Cast Iron Crack Repair

Hey Mike,I wouldn't send it out for repairs yet and I wouldn't look for a new block.All you have to do is make it water tight and since it is not a pressurized system I would doubt regular stop leak would work.First I would try a sal ammoniac solution or salt water to form a permanant rust seal.If the cracks are fine this works good.Next,you could vee the cracks and use JB Weld or some other epoxy.Last,it could be welded but if the cracks are small and don't cause a strength or stress problem I would try the above first.There is much information in the archives on crack repair.Good Luck,Chip
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Old 01-16-2005, 09:36:44 PM
TerryJay TerryJay is offline
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Default Re: Cast Iron Crack Repair

look at using a gas tank sealer like those used on classic cars ,we use it all the time on our tractors we are restoring with no problems
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Old 01-16-2005, 10:52:37 PM
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Default Re: Cast Iron Crack Repair

Hi Mike,
Assuming it's just the water jacket you're worried about, JB Weld will work nicely. I've used Devcon Titanium and Belzona for CI repairs, but they're much more expensive and probably don't work any better.

If your repair will be visible and you'll be keeping the engine original, you might want to do what was already mentioned: use a gas tank sealer or thin epoxy painted on from the inside. I like this stuff for that type of repair: http://www.xp2000.com/

Rob
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Old 01-17-2005, 08:38:34 AM
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Default Re: Cast Iron Crack Repair

I repaired a crack in a water cooled head once with JB and it still does leak to this day the only drawback I found was once it is painted the JB is very smooth while most cast is not and if you know where to look you can see the smooth paint on it and not smooth on the cast
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Old 01-17-2005, 01:45:36 PM
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Default Re: Cast Iron Crack Repair

Did twice the Sal-amoniac trick and it works both times for me, never leaked again.
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Old 01-17-2005, 01:50:08 PM
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Default Re: Cast Iron Crack Repair

A guy on one of the tractor boards that i visit suggests that when trying to repair cracks using JB weld in a piece of cast iron, spread enough JB weld in the crack (after V'ing it out) to just fill it in....not too much, not too little. Then, as it is drying and especially on a vertical surface, the JB weld likes to creep or run down, so you take a piece of relatively medium grit sand paper and put it rough-side-down on the JB weld and hold it in place with masking tape. This way, the surface texture of the sand paper is transfered to the JB weld and everything looks as it should be. I have never tried it myself personally, but it sounds like it should do a decent job.
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Old 01-17-2005, 06:17:20 PM
Kevin O. Pulver Kevin O. Pulver is offline
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Default Re: Cast Iron Crack Repair

Any of the above will work well. For my money, the most permanent, easiest to apply, and best looking would be the tank sealer poured in from the inside. You probably can't reach the spot, but a bit of RTV silicone applied when dry would do the same thing. It would work outside as well, but paint won't stick to it and it could look tacky. Use the black silicone and it doesn't stand out so bad. Kevin
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Old 01-17-2005, 06:19:06 PM
Nick Stanley
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Question Re: Cast Iron Crack Repair

Where do you guys get sal-ammoniac? I know you can order it from mcmaster-carr in block form for tinning soldering coppers, but I would like to purhase locally? Thanks.
-Nick
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Old 01-17-2005, 07:41:28 PM
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Default Re: Cast Iron Crack Repair

I ordered it at the pharmacist shop and the next day I could collect it. It sits in a plactic can and weights 2 lbs.
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Old 01-18-2005, 10:26:43 AM
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Default Re: Cast Iron Crack Repair

I've used water glass (sodium silicate) to seal up cracks in engines. Just put a little in the coolant while the engine is running.

As for the outside treatment, I'd recommend JB-Weld. A friend of mine has a beautiful vertical IHC engine that had 18-inches of cracks in it before restoration. He used JB-Weld and doesn't have a leak, anywhere.

I get my water glass from McMaster-Carr. It is not expensive. You can order from them on-line.

Orrin
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Old 01-18-2005, 11:58:05 AM
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Elden DuRand Elden DuRand is offline
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Default Re: Cast Iron Crack Repair

Quote:
Originally Posted by Orrin
I get my water glass from McMaster-Carr. It is not expensive. You can order from them on-line.

Orrin
Orrin:

Water glass is also called Silicate of Soda. It may be easier to find under that name.

Take care - Elden
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Old 01-19-2005, 09:45:30 AM
Orrin Orrin is offline
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Default Re: Cast Iron Crack Repair

The McMaster-Carr search engine is very forgiving. Go to...

http://www.mcmaster.com/

...and type sodium silicate in the "Find" field and you'll get an immediate hit. Click on the "+" next to "Sodium Silicate" and you'll be taken to the catalog page where the chemical is listed as sodium silicate and by no other name.

It's useful to have some on hand. The McM-C price is only $12.20 per gallon.

Regards,

Orrin
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Old 01-19-2005, 04:22:52 PM
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Smile Re: Cast Iron Crack Repair

If you want the cast iron look, sprinkle a little silica sand on the paint when wet. It will dry and look like the cast iron.
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