Thread: Welch plugs. Kill me now.

why are you putting it in backwards?

Originally Posted by Blknight.aus

why are you putting it in backwards?

Ahhh. Well pointed out. I looked at the pictures of the disassembly and it was that way then. So I assumed that was the way it went.

Redundant disclaimer: I have no idea what I’m doing.

Originally Posted by Blknight.aus

why are you putting it in backwards?

Blunt as a bowling ball.
Couldn't you let him down gently?!

Originally Posted by Toxic_Avenger

Blunt as a bowling ball.
Couldn't you let him down gently?!

Nah. Rather be told I’m a goose and get it right.

OK..

Originally Posted by Kimsl70

Nah. Rather be told I’m a goose and get it right.

Youre a goose, get it right.

there are 2 types of the plugs.

that one goes in the other way.
the other one goes in that way.

The key is to look at the doming and the angle (or lack thereof) in the sides.

The latter one that goes in that way is getting rare, I havent seen one since i did the exact opposite of what you've done and tried to put the one that goes in that way in the other way and promptly knocked it all the way in on the first go. At least it was easy to get out as the lips were facing out.

Originally Posted by Blknight.aus

there are 2 types of the plugs.

that one goes in the other way.
the other one goes in that way.

The key is to look at the doming and the angle (or lack thereof) in the sides.

Cheers !! I’ll go and have a look. Thanks the reply I appreciate it.

I don't know how you managed to even get it in that way, the out side is slightly tapered.

The two types are (at least originally) should have slightly different holes. The one shown is designed to go into a smooth sided hole machined as deep as the skirt, and relies on friction (plus whatever goo you put on it).

The other type is only slightly domed and is inserted as Dave says, with the dome out. It only needs the hole machined for a much shallower depth and must have a machined ledge and a slightly larger groove just above the ledge.

When the dome is hammered in, this typed of plug expands into the groove to seal. In many applications with only low pressures, and using modern sealants, either type works, although you are better to use the same as the manufacturer used - and note that the hole for a block heater in the Series 2 engine has a screw in plug with a weird thread.