Why not to remove spark plugs from hot aluminum heads? - Hot Rod Forum : Hotrodders Bulletin Board
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Old 09-14-2006, 09:17 AM
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Why not to remove spark plugs from hot aluminum heads?

Can anyone enlighten me? I have heard that a guy should not pull the plugs until the motor has cooled off a little. Heard different reasons. Is there any truth to this?

Want to make sure i don't run my plug threads or crack the heads or ????

thanks for any help!!

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Old 09-14-2006, 09:23 AM
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keep it cool man

if the head is hot and when you remove the plug the aluminum can warp/deform the spark plug hole and wont be able to get the plug back in straight and mess up the treads
ALWAYS remove them cold dead cold
me and my brother learn from our expensive mistake on our e/t bracket racer
if you go to a nhra race and watch the pro stock when they get back to the pits first thing they do is get the fans blowing on the engine and bags of ice on the intake area getting it to cool dowm as fast as they can before the next round and they have only 75 min to work on them
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Old 09-14-2006, 09:38 AM
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I have never had an issue removing plugs from a hot motor, with or without aluminum heads.
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Old 09-14-2006, 09:39 AM
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I would suggest that if you have the time to let it cool down first, than that's what you should do. I have replaced hundreds if not thousands of spark plugs in hot (operating temps) cylinder heads over the years, with no ill effects.

I say if it cracks by pulling out the spark plug, it is a weak spot and it was pron to cracking anyway.

Just my .02

Steve
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Old 09-14-2006, 09:53 AM
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Quote:
Originally Posted by cabowabo
if the head is hot and when you remove the plug the aluminum can warp/deform the spark plug hole and wont be able to get the plug back in straight and mess up the treads

thats pretty much what I heard. but it seems strange to me.

Like Rick and Steve said, they've never head a problem. I sure hate to learn the hard way, but it's going to be annoying to have to wait on them to cool as well. I don't get to the track much, so it will be awkward to be sitting on the side of the road waiting for her to cool down.
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Old 09-14-2006, 09:53 AM
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i've pulled plugs on an 540 inch outlaw super stock running 7.90's at the end of the track with no problems,but would agree it would be best to wait till cooled down.
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Old 09-14-2006, 10:24 AM
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I think the threads on aluminum heads get screwed up from overtightening and lack of anti-seize. Removing them hot, is probably not the greatest idea, but if they have anti-seize on the threads, it sure helps.
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Old 09-14-2006, 10:59 AM
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I have never heard that before. I usually pull multiple plugs on the return road when tuning and have never had an issue. I usually only have them out for a few minutes or replace them with another plug and drive back to the pits.
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Old 09-14-2006, 11:46 AM
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[QUOTE=poncho62]I think the threads on aluminum heads get screwed up from overtightening and lack of anti-seize.QUOTE]

Ding! Right on the money comment.
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Old 09-14-2006, 12:37 PM
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Felpro copper colloidal anti-seize is EXCELLENT.

The copper burnishes into the metal pores for semi-permanent protection.
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Old 09-14-2006, 12:58 PM
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can you get the felpro copper anti seize anywhere??
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Old 09-14-2006, 03:25 PM
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Don't burn your fingers!
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Old 09-14-2006, 06:12 PM
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I used to pull the plugs on my VW Beetle only when the motor was hot. When it was cold, they were so tight the threads would try to come out with the plugs. Same with my Fiat 124, never even tried that one cold. Aluminum expands more than steel with a given amount of heat, so the hole is always looser when it's hot.
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Old 09-14-2006, 06:27 PM
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Quote:
Originally Posted by hotrodf1
can you get the felpro copper anti seize anywhere??
I think the stuff Xntrik is referring to is FelPro C-5A, we have a ton of it at work. It is good stuff.
Quote:
Originally Posted by 1ownerT
Don't burn your fingers!
That's precisely why I try not to pull them hot.
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