Welch plugs. Kill me now.

[Kimsl70]

G’day all. Just curious if anyone know where to source the correct Welch plug for the timing chain end of the 2.25 ? I ordered these but they look way to ‘ long ‘. They shouldn’t sit proud should they ? https://uploads.tapatalk-cdn.com/20191126/dc547977ded578b14de82e9b1b00a75a.jpg


https://uploads.tapatalk-cdn.com/20191126/311a4915a484a008a97fd3c3735bf724.jpg

[Blknight.aus]

why are you putting it in backwards?

[Kimsl70]

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.

[Toxic_Avenger]

why are you putting it in backwards?

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

[Kimsl70]

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

Nah. Rather be told I’m a goose and get it right. [emoji23][emoji23][emoji23]

[Blknight.aus]

OK..


Nah. Rather be told I’m a goose and get it right. [emoji23][emoji23][emoji23]

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.

[Kimsl70]

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.

[1950landy]

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

[JDNSW]

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.

[Kimsl70]

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

With a hammer.

[workingonit]

Has kimsl70 got the correct plug type if his information showed 'dome out'? Was there a machined landing in the hole as described by JDNSW - hinted at by the fact you can't get the plug in further? Either way I've learnt something.

[mick88]

The type of plug in the photograph is a "Cupped" Welsh Plug, the other type mentioned is a "Dished" Welsh Plug.
Welsh Plugs can also be referred to as Core Plugs, Freeze Plugs, or Expansion Plugs.

Cheers, Mick.

[Kimsl70]

Has kimsl70 got the correct plug type if his information showed 'dome out'? Was there a machined landing in the hole as described by JDNSW - hinted at by the fact you can't get the plug in further? Either way I've learnt something.

So have I. It’s been great.

[Blknight.aus]

edited, not sure why the goose quote got here


So have I. It’s been great.

no but on some engines there is a lip so when you beat the plug in it automatically tilts in the right direction..

theres a non LR breed of engine whence if you do that the plug will sit square on whats behind it and you have exactly no chance of getting it out in the normal fashion. Much inventiveness and application of mechanics words at the appy who got it wrong is required.

And no, you cant just beat it till it bends, the casting behind it breaks off, Which in turn means

1. if the piston was at BDC you can now inspect the crown
2. you have a dry liner inserted and dont really need to stress too much
3. you wanted to do a dry liner conversion
4. technically its now going to be a wet liner conversion.

[Kimsl70]

G’day all. The great people at Turner Engineering came up with NOS Welch plugs appropriate to my block. Thanks for all the help and guidance. I really appreciate it.

[p38arover]

The type of plug in the photograph is a "Cupped" Welsh Plug, the other type mentioned is a "Dished" Welsh Plug.
Welsh Plugs can also be referred to as Core Plugs, Freeze Plugs, or Expansion Plugs.

Welch.


The Welch plug was originally designed in the 1900s at the Welch Motor Car Company in the United States.

Core plug - Wikipedia (https://en.wikipedia.org/wiki/Core_plug#Welch_plug)

[Kimsl70]

Welch.



Core plug - Wikipedia (https://en.wikipedia.org/wiki/Core_plug#Welch_plug)

Thanks for that. The Welch plugs I got fit perfectly.