View Full Version : Welsch plugs
First of all i wanna meet this welsch fella who invented the welsch plugs and rip him a new one, what possible purpose could they carry? The only thing i can think of is they are made of a sacrificial metal so that the rest of the system doesnt corrode.
Anyways i cleaned up the one on the side of the engine head (under the water pump pulley) and there was gunky oil and some green stuff (coolant) wasnt sure if that was new or old so i cleaned it all up, and now weeks later theres a good fresh buildup of fluro green gunk.
So i was sondering how you replace a welsch plug? more specifically how do you remove the old one? and how do i get a replacement one? I dont like going to mitsu for 1 single part, can i get it from bursons? how do i describe it or will it only come in a kit?
Thankyou for your time :)
turbo_charade
25-07-2004, 08:55 AM
They help you to clean the block and to check for damage and remove foreign stuff. and there other purpose is to leak, crack, stick in and to generaly be more bad than good
FamilyWagon
25-07-2004, 09:06 AM
Arent they used when the engine blocks are made to get rid of any manifacturing grit and sand from within the block? Donno about these days but i thought engines use to have like a sand in them when the blocks were being casted and the plugs were used as access points to give the block a good flush after casting. Could be totally wrong but remember something along those lines.
Just a note ever noticed the manufacturers fit metal welsch plugs to your motor which corrode if coolant aint kept right and when you buy replacements (which you can buy in a kit or you can buy them on there own ) you buy nice brass ones that dont corrode, be nice if they did this in the first place! :D :D :D
Mark H
25-07-2004, 01:50 PM
Arent they used when the engine blocks are made to get rid of any manifacturing grit and sand from within the block? Donno about these days but i thought engines use to have like a sand in them when the blocks were being casted and the plugs were used as access points to give the block a good flush after casting. Could be totally wrong but remember something along those lines.
Your along the right lines, during casting the welsh plug holes gives access to moulding material to form the centre galleys where coolant runs. If the welsh plug holes were'nt there, they would not be able to make the central galleys for coolant to run.
Apart from that, I'm guessing there are a lot of people asking if there is an easier way as those things are a damn messy pain in the a$$. :rant:
I think you should be able to buy aftermarket welsh plugs seperately and use some aftermarket gasket goo to stick em back in with. Have fun lol
so ill go to bursons asking for a welsch plug of a specific size? And what i really wanna know is how do i remove the old plug?
benau
26-07-2004, 10:58 AM
to remove a welch plug knock it into the coolant gallery with a socket of a size that just fits in the plug then turn the plug around around on it's side and pull it out with a pair of multi-grips, b4 u fit new plugs clean up the block edge with emery cloth. to fit new one's i've always used a socket as mentioned above and also coated to sealing edge in a jointing compound like "stag". if your replacing your welch plugs don't forget there's at least one behind the flywheel as well :rant: , have fun
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