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330Topolino
Pulling spark plug tubes


Have a set of tall block DeSoto heads that I’m getting ready to rebuild. Someone managed to get the valve covers off without getting all of the plug tubes out. Plugs have all been removed. Three tubes seem stuck pretty tight. Anyone else encountered this before? I’m considering getting a piece of H R steel 1.25” diameter (I.D. Of the tube), drilling it through end to end and threading it to match my slide hammer. Figure if I stuck it into the tube and clamped Vice-Grip onto it, I might be able to pull them. Is there a simpler approach?
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on: Wed 09 of May, 2018 [19:34 UTC] reads: 1001

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Odiesdad
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Re: Pulling spark plug tubes
on: Mon 14 of May, 2018 [19:16 UTC] score: 0.00
I used a deep well socket with an extension that just fit inside the tube and tapped against that with a hammer until they worked loose.
Helped to repair some dents in the tubes too.
I did use some Kroil before that.

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Jack
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Re: Pulling spark plug tubes
on: Thu 10 of May, 2018 [18:01 UTC] score: 0.00
> Have a set of tall block DeSoto heads that I’m getting ready to rebuild. Someone managed to get the valve covers off without getting all of the plug tubes out. Plugs have all been removed. Three tubes seem stuck pretty tight. Anyone else encountered this before? I’m considering getting a piece of H R steel 1.25” diameter (I.D. Of the tube), drilling it through end to end and threading it to match my slide hammer. Figure if I stuck it into the tube and clamped Vice-Grip onto it, I might be able to pull them. Is there a simpler approach?

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Jack
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Re: Pulling spark plug tubes
on: Thu 10 of May, 2018 [18:00 UTC] score: 0.00
Arguably the best penetrant ever is a 50-50 mix of acetone and ATF.

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hemistude
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Re: Pulling spark plug tubes
on: Thu 10 of May, 2018 [15:23 UTC] score: 0.00
>I worked up a good sweat, but got a good sense of accomplishment from it.>

Nice work Topo! It always feels good when you lick a perplexing problem like that.

It's amazing what a creative mind can come up with when you pull up a chair next to the problem and stare at it long enough. For me, a premium cigar adds a 1.5 multiplier to the abstract formula.

I'm glad you found a solution that saves the tubes.

As for the "stuck-by-rust" problem, I use a spray product called Kroil. It's a little expensive but I'v had my can for 8 years and it saves the day for me regularly. You may want to check it out.

Dave

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moparruss
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Re: Pulling spark plug tubes
on: Thu 10 of May, 2018 [14:09 UTC] score: 0.00
Hot Heads also sells some pieces that you shrink fit into the spark plug tube holes in the head (machining required). Then the tube is sealed with an o-ring when you insert it. This keeps oil from seeping in between the tube and the head and "cokeing up", which makes the tubes really hard to remove. I installed these on my 341 Desoto when I did the heads and I highly recommend them.

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hemistude
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Re: Pulling spark plug tubes
on: Wed 09 of May, 2018 [19:50 UTC] score: 0.00
> Someone managed to get the valve covers off without getting all of the plug tubes out. Three tubes seem stuck pretty tight.

Why not drive a sharp scratch awl down between the shell and the head and fold the tube inward then take a pair of pliers and rip them out? With the wall folded inward, you should be able to spray some rust solvent around it pretty easily if they resist your effort.

Dave

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330Topolino
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Re: Re: Pulling spark plug tubes
on: Wed 09 of May, 2018 [22:25 UTC] score: 0.00
> Why not drive a sharp scratch awl down between the shell and the head and fold the tube inward then take a pair of pliers and rip them out? With the wall folded inward, you should be able to spray some rust solvent around it pretty easily if they resist your effort.
>
> Dave

Was wanting to see if I could get them out intact. Thought my original plan over, and figured the rod would probably slide out too easily. Then I had a flash of inspiration, while looking at my ratchet handle. I made the stub of steel rod and proceeded to put knurling on it. Threaded the slide hammer into it, clamped the tube down against it with the Vice-Grips, and went to town. As soon as I saw some movement, I loaded it up good with WD-40. Voila! Three tubes out, without trashing any of them! Took quite a number of hits with the slide, and I worked up a good sweat, but got a good sense of accomplishment from it. I’ll probably end up using the new tubes that HH offers, but had to see if I could do it.

Thanks for taking the time to respond and offering a thoughtful and reasonable plan.


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