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Farmall & IHC Tractors Discussion Forum
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Broken Spark Plug in H Farmall

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Tom Windsor

03-15-2006 18:09:57




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Well, I have done it again. I broke a plug off in the block. Thought I was being very careful...guess it was just very very thin walled. The last time, I goobered up the a head trying to get it out and wound up putting a helicoil in it. Before I get on this one...I would like some input.

Tw




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Michael Soldan

03-15-2006 18:39:03




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 Re: Broken Spark Plug in H Farmall in reply to Tom Windsor, 03-15-2006 18:09:57  
Tom, I worked in an auto shop for a few years and I learned a lot from my boss. Her goes..take a brazing tip on your torch and heat whats left of the plug red hot, it will take some time, then douse it with cold water and make sure you have really cooled it down, don't worry about water in the cylinder. The plug will now turn out with needle nose, vise grip or whatever you can get a hold of it with . Once the plug remenants are out blow the cylinder out with your air hose, getting any water and pieces of porcylin out at the same time. Use an anti sieze on the new plug. I have also had good luck with easy outs on broken plugs, tap a large easy out into the wall of the plug and they usually come out( I am talking about the square style easy outs)I took 6 of 8 plugs out of a kid's car like that, all 6 broke, twisted off. Plugs should never be installed in a warm engine, this is likely why they won't come out. The warm engine is expanded and when you tighten a plug into it when the engine cools down that plug is just about welded in place, will take incredible torque to remove it. As well plugs should come out easier if the engine is warm, less likely to twist off. Anyway, I have always managed to get them out, some folks don't have any use for easy outs but the square shanked ones work well on plugs and lots of other applications...good luck with the plug...Mike in Exeter Ontario

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MeAnthony

03-16-2006 04:32:08




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 Re: Broken Spark Plug in H Farmall in reply to Michael Soldan, 03-15-2006 18:39:03  
"As well plugs should come out easier if the engine is warm, less likely to twist off."

I was taught to not pull plugs on a warm aluminum-head engine, as the aluminum was more prone to damage (in the case of a diffucult plug removal) when warm. As you said you have experience in an auto shop, what's your opinion on this?

Thanks,
Anthony



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Tom Windsor

03-16-2006 18:14:03




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 Re: Broken Spark Plug in H Farmall in reply to MeAnthony, 03-16-2006 04:32:08  
I agree that warm is good. However, if it has been sitting for 25 years as this one has, the only way to make it warm is build a fire around it.

I can go with the heat on the plug as you suggest. But, I have problem quinching it with water. I am afraid that I might crack the block. I went out there and got it real hot with a torch today...let it cool and then took it out with a square easy out as you suggested. The heat did it.

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