Sealant for welch plugs

[maldotcom2]

I read somewhere that when installing new welch plugs, to put loctite on the rim. Is that the best stuff to use, or some kind of RTV sealant?

[Blown V6 Hatch]

I always use GM sealant when fitting welsch plugs, just a light smear and bang them in. It's a bit pricey, but it's worth it.

[maldotcom2]

Is that similar to an RTV sealant?

[Blown V6 Hatch]

Na, not really. It looks a lot like honey, great stuff. I use it on everything that touches water, head bolts, manifold bolts, screw in studs etc.

[GenReaper]

GM sealant is ok but i would reccomend this : http://www.permatex.com/products/Aut...et_Sealant.htm

As an ex mechanic i have done many a core plug change in my time and always used that stuff and never ever had a failure.

Make sure you use a socket to bang them in with thats a nice fit and hold it flush on the welsch plug and tap them in and try not to c0ck the plug.

[maldotcom2]

Thanks. I see a lot of conflicting information about the use of sockets to install welch plugs. Should i use a socket that fits inside the plug, or one that sits on the outside rim?

[GenReaper]

Thanks. I see a lot of conflicting information about the use of sockets to install welch plugs. Should i use a socket that fits inside the plug, or one that sits on the outside rim?

Inside the plug, but not so big as it sits in the middle of the plug and slops around, use one that is nearly as big of a diameter as the inside of the welsch plug, just make sure its not a tight fit cause when you bang it in the flared edges close up and it grabs on the socket due to crush and you will have a hard time getting it out if it jams up. If your socket has about 2 - 3mm of slop when inside the welsch plug you should be fine. Just dont use a realy small socket as you will damage the plug due to warpage and it will probably leak.

Most important thing is to make sure it goes in square to the block and not c0ck it.

[VSHeaven]

GM sealant.............P/N 3835215

[strgas]

gm sealant , stag , silastic , 5 minute expoxy glue , used them all on welsh plugs never had a problem always clean the hole of the block with sand paper and thinners carby clean to remove any loose sealant from the last plug , always use brass welsh plugs .

[autodetailing]

Try to find a car repair company which is offering such type of service.

[ari666]

spermatex .

[VR38]

Is that similar to an RTV sealant?

Type 3, either GM or permatex or whatever brand. NEVER USE SILICON based products.