Screw in Welch red Plug - diameter and thread

[Sherlock2A]

I am going to wear out my welcome here but I love this forum!

My 67 2A 109" has the 2.25 petrol engine. It is missing one of the screw in welsh plugs at the front of the engine on the LH side - the guy I bought it off said it had a "slow" leak. I would hate to see his version of fast...

It is the smaller of the welsh plugs that are above the main 3 push in plugs. There is one at the front and one at the back on the LH side just under the manifold.

Does any one know the diameter of the replacement? I assume the thread is BSP but would like that confirmed as well if I may.

Cheers in advance

Peter

[flyboy]

Hi Peter,

The part number is RTC4250.

It’s 1” and the thread is BS Conduit. I’ve just spent ages tracking down a thread tap for mine!

For some reason, there seems to be a worldwide shortage of RTC4250’s at the moment! Just about every website is listing “out of stock”. I know, because I’m also trying to track one down!

Marcus

[Sherlock2A]

Hi Peter,

The part number is RTC4250.

It’s 1” and the thread is BS Conduit. I’ve just spent ages tracking down a thread tap for mine!

For some reason, there seems to be a worldwide shortage of RTC4250’s at the moment! Just about every website is listing “out of stock”. I know, because I’m also trying to track one down!

Marcus

Thanks Marcus, I appreciate that. Yes, the hunt continues then. I did see some listed on Aussie sites but out of stock until July. Hence now, I am trying to find an alternative - even if only temporary.

Do you mind sharing where you sourced the tap from?

Cheers

Pete

[Lionelgee]

Hi Peter,

The part number is RTC4250.

It’s 1” and the thread is BS Conduit. I’ve just spent ages tracking down a thread tap for mine!

For some reason, there seems to be a worldwide shortage of RTC4250’s at the moment! Just about every website is listing “out of stock”. I know, because I’m also trying to track one down!

Marcus

Hello Marcus & Pete,

How about this .... Welch Plug suitable for Land Rover Series 2 2a 3 2.25L 4 Cyl Petrol Diesel
Described as "In stock". Accessed 13th April 2021 from, https://www.allfourx4.com.au/RTC4250

Kind regards
Lionel

[Sherlock2A]

Hello Marcus & Pete,

How about this .... Welch Plug suitable for Land Rover Series 2 2a 3 2.25L 4 Cyl Petrol Diesel
Described as "In stock". Accessed 13th April 2021 from, https://www.allfourx4.com.au/RTC4250

Kind regards
Lionel

Hey thanks Lionel, I will check that out.

Cheers

Pete

[flyboy]

Thanks Lionel,

Yes, I did actually see that this morning so will order one!

Peter, the tap I bought off an engineering supply store on eBay and just arrived yesterday. You’re welcome to borrow it after I’ve used it. Where are you located?

[Sherlock2A]

Thanks Lionel,

Yes, I did actually see that this morning so will order one!

Peter, the tap I bought off an engineering supply store on eBay and just arrived yesterday. You’re welcome to borrow it after I’ve used it. Where are you located?

Hey Marcus, I am up in Woodend about 1hr north of Melbourne. Very kind of you mate if it is "doable" - I am pulling the manifold off this weekend so I can actually see what I am doing!

[mick88]

I have some brass ones made up here for the purpose, 1" x 16 TPI Conduit Thread.
They just need to be slotted with a hacksaw then fitted with some form of thread sealant.
They are basically the same as these alloy ones, but made of brass.
$15 per Plug plus postage.

Cheers, Mick.

[p38arover]

Welch! Welch!

So many people say/write Welsh.

(Thread title amended.)

[gromit]

Welch! Welch!

So many people say/write Welsh.

Isn't the domed disc type a Welch plug, a threaded plug is just a plug ?

History of the Welch Plug


Colin