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Welsch plugs leaking 

 

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 Post subject: Welsch plugs leaking
Posted: Mon Oct 21, 2013 12:56 am 
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Hey guys!!

I did the 5 welsch plugs on the exhaust side a while back and now they're all leaking coolant. I'm assuming just whacking them in wasn't the best thing to do and I should've used some type of sealant or something?? I even cleaned the heavily corroded surfaces with acetone and a rag before installing the new plugs but still they leak :( I'll go get some new plugs tomorrow but I was just wondering if there's any particular sealant I should use? Any help would be greatly appreciated!
cheers
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 Post subject: Re: Welsch plugs lol..
Posted: Mon Oct 21, 2013 2:12 am 
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You need to use some stuff called "STAG jointing compound"

Comes in a tube that looks like this:

 

 

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$T2eC16N,!zQE9s3srYVcBRQVIpJDlw~~60_3.jpg
$T2eC16N,!zQE9s3srYVcBRQVIpJDlw~~60_3.jpg [ 33.49 KiB | Viewed 39 times ]
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 Post subject: Re: Welsch plugs lol..
Posted: Mon Oct 21, 2013 8:55 am 
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I used Araldite when i did all mine, havnt had any dramas at all :)

 

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 Post subject: Re: Welsch plugs lol..
Posted: Mon Oct 21, 2013 10:01 am 
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Falcon96XR6 wrote:
I used Araldite when i did all mine, havnt had any dramas at all :)


I'm glad you don't work on my car then lol
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 Post subject: Re: Welsch plugs lol..
Posted: Mon Oct 21, 2013 10:08 am 
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Gab1 wrote:
Falcon96XR6 wrote:
I used Araldite when i did all mine, havnt had any dramas at all :)


I'm glad you don't work on my car then lol


+1 going to be fun getting them out when they leak again

 

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 Post subject: Re: Welsch plugs lol..
Posted: Mon Oct 21, 2013 1:19 pm 
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I use Loctite 271....never had a problem. Preperation is the key.

 

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 Post subject: Re: Welsch plugs lol..
Posted: Mon Oct 21, 2013 4:15 pm 
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Ive used araldite on a few of my familys E series and also changed a few after theyve been put in with araldite, they just knock out the same as always lol

 

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 Post subject: Re: Welsch plugs lol..
Posted: Mon Oct 21, 2013 4:40 pm 
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that STAG stuff is the ONLY s**t you should use on welsh plugs, simple as that.

Gab
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 Post subject: Re: Welsch plugs lol..
Posted: Fri Oct 25, 2013 7:07 am 
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cheers fellas, I got some of the stag stuff and after getting it all back together i put the coolant in and it started pouring out 3 of the plugs so I've stuffed something up. I've got 4480 extractors welded in that made it hard to get the plugs in straight so I'm going to cut the extractors out and try again. The main problem though is the holes the plugs go into in the block are badly corroded, even sanded back there's massive chunks/chips in them so the plugs will never seal perfect.. not really sure what to do here was just gonna JB weld it and hopefully I don't have to pull it apart again. Hopefully I won't need a new block haha
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 Post subject: Re: Welsch plugs leaking
Posted: Fri Oct 25, 2013 1:37 pm 
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You need to knock them in VERY squarely, some pitting should be ok, just make sure you use LOTS of stag on them.

Gab
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 Post subject: Re: Welsch plugs leaking
Posted: Sat Oct 26, 2013 7:46 am 
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If there was huge chunks of rust on the sealing surface and you had to sand it back then I think you may be up s**t ditch.
But as said, hitting them in square it so Importaint, I use a socket that fits snug inside the welsh plug and tap it in that way.
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 Post subject: Re: Welsch plugs lol..
Posted: Sat Oct 26, 2013 8:14 am 
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ILLaViTaR wrote:
cheers fellas, I got some of the stag stuff and after getting it all back together i put the coolant in and it started pouring out 3 of the plugs so I've stuffed something up. I've got 4480 extractors welded in that made it hard to get the plugs in straight so I'm going to cut the extractors out and try again. The main problem though is the holes the plugs go into in the block are badly corroded, even sanded back there's massive chunks/chips in them so the plugs will never seal perfect.. not really sure what to do here was just gonna JB weld it and hopefully I don't have to pull it apart again. Hopefully I won't need a new block haha


did you wait 24 hours for the stag to set???

in saying that I had same issue with the mrs au Fairmont, it had been leaking from welch plugs for quite some time before we got it resulting in a lot of deep pitting where the plugs go in,
unfortunately the stag just wouldn't seal. so the alternative was to use ultra blue gasket silicon, I lightly coated both surfaces and tapped the plugs in, wiped off excess and left it to set..
its been close to 3 years and so far no problems..
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 Post subject: Re: Welsch plugs leaking
Posted: Sat Oct 26, 2013 10:47 am 
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Try fitting these style of welsh plugs.....1935 Willys 77 engine....they are like a curved,dish shape made of steel.....no sides like a normal welsh plug.....they have a stepped hole, and they just sit in the hole....they are not an interference fit.....once glued in, you then give them a tap in the middle with a rounded punch......it is an art to fit these......hit it too hard, then it isn't going to seal.

Just showing you guys what else was/is out there.....you know....automotive history stuff.

 

 

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1935 Willys 77 engine 003.jpg [ 380.29 KiB | Viewed 30 times ]

 

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 Post subject: Re: Welsch plugs leaking
Posted: Sat Oct 26, 2013 11:04 am 
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looking at ya pic they 'look' like they are interference fit once they are centre tapped? be a bugga ta get right tho
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 Post subject: Re: Welsch plugs leaking
Posted: Sat Oct 26, 2013 4:49 pm 
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Mad2 wrote:
looking at ya pic they 'look' like they are interference fit once they are centre tapped? be a bugga ta get right tho


Yep....but if you hit it too hard, then it is lost again.

 

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