Weeping Rear Welch Plug

[LandyDude]

G'day Everyone

Getting Arthur ready for his next outback trip. One issue I have had for a while is a weeping rear welch plug (the one on the back of the block that's impossible to get to :(). I've got by on the last trips using 'Bars Leaks'. Since the next trip is planned over to Lake Gairdner SA and has the potential to be hotter, I'm worried about the plug giving way when I least want it to.:eek:

I understand this plug is a real bugger to replace. So am contemplating making a hole in the firewall to get to it as I've heard it can be done this way.

I'd love to hear of any tips, tricks, better ideas, warnings etc. before starting something I might regret.

PS. I've already replaced the welch plugs on the side of the block when I last had the manifolds off.

[stevetd5]

You didn't say wether rear plug was in the head or the block. steel welch plug at rear should be able to be replaced as mentioned by cutting a hole (hole saw) in bulkhead. If its the one that screws into the head I would take the head off as there are others hidden by the manifolds and a number along side the pushrods under the rocker cover these should be checked also. No point in fixing one if the others are about to go.

[miky]

Seem to remember when I replaced the one at the back of the block there was a plate on the inside which had something about how to use the gears?

Just took the plate off and cut a hole, replaced the plug and screwed the plate back on.

It was an easy job even for someone (me) who at the time was not really that mecanocally minded.

Mike
ps. still can't spell..

[LandyDude]

Thanks Guys

It's the one block at the rear. Looks like a hole in the firewall is going to be the way. I'm hoping it comes out fairly 'easily'. Of course I know that's only wishful thinking and these 'little' jobs are always hard work. :( Better that though than it bursting on the next trip.

[LandyDude]

While I'm summoning up the courage to start this 'simple little job', does anyone happen to know what size the welch plug is (it the one on the back of the block)?

Figure I should get the plug before I start ;)

[d@rk51d3]

I'll see if I can find a tape and duck out an measure it now. ;)

[d@rk51d3]

OK. Found some calipers instead..............:cool:

Welch plug at the back of the block is 35mm (measured 35.1)
then there's 3 under the exhaust manifold that are 50mm.


EDIT - These were measured in-situ, so they may need to be a touch larger to be a tight fit???????

[LandyDude]

OK. Found some calipers instead..............:cool:

Welch plug at the back of the block is 35mm (measured 35.1)
then there's 3 under the exhaust manifold that are 50mm.


EDIT - These were measured in-situ, so they may need to be a touch larger to be a tight fit???????

Thanks for measuring.

Seems to me thenthat it's a 1-1/4" since it would be an imperial measurement. Hopefully not too hard to come by.

[d@rk51d3]

No, 1 1/4" is only about 32mm.



.......... unless you plan on packing it out with some thread tape.:D

[LandyDude]

No, 1 1/4" is only about 32mm.



.......... unless you plan on packing it out with some thread tape.:D

Doh! :o I misread the 35 as 32.

35.1mm is approximately 1.382" . It's an odd size, which doesn't seem to be an imperial fraction measurement. 1-25/64" is getting close at 1.384"

[d@rk51d3]

Doh! :o I misread the 35 as 32.

35.1mm is approximately 1.382" . It's an odd size, which doesn't seem to be an imperial fraction measurement. 1-25/64" is getting close at 1.384"

1" 5/8 (probably too big)

or

1" 19/32 ????

Not sure if that's a real size. :D

[foz.in.oz]

According to the parts manual it should be part no.250840 and should be 1 1/2" diameter.

See here also 250840 CORE PLUG 1.1/2 | shop | www.lrseries.com | L. R. Series (http://www.lrseries.com/shop/product/listing/299/250840-CORE-PLUG-1-1-2.html'search=250840&page=1)

[LandyDude]

I found the diagram below on : Land Rover parts - WELSH PLUGS - 2.25 PETROL (http://www.roverparts.com.au/welsh_plugs___2_25_petrol?b=1)

which makes it even more confusing as it shows two plug options one at 1-3/4" and the other at 15/16"

But the part details show them at 1.7" (R587628) and 0.95" (R525497) respectively :eek::eek:


https://www.aulro.com/afvb/images/imported/2010/01/129.jpg

[d@rk51d3]

Looks like 2 plugs at 1" 3/4, and then 1 plug at 15/16...............

Are there plugs under the flywheel housing?

[foz.in.oz]

OK, Just went and measured what is in my 63 2a and it is deffinately NOT 1 1/2" so the parts manual on the Series 2 CD I bought from Dave is bunkum!!!!

1 3/4" it is. just like the previous post suggests.

[d@rk51d3]

OK, Just went and measured what is in my 63 2a and it is deffinately NOT 1 1/2" so the parts manual on the Series 2 CD I bought from Dave is bunkum!!!!

1 3/4" it is. just like the previous post suggests.

Problem is, that diagram asks for 2 of said plugs. But there's not 2 holes, and the 1 hole that is there is nowhere near that big.


Come to think of it, 1 3/8" would be very close to 35mm (34.925mm), and that is where my money would be.

[d@rk51d3]

Just found a post, on another thread......

1 3/8" it is.


http://www.aulro.com/afvb/remlr-technical/42336-welsh-plug-info.html


Check post#6 and #7.

Thanks Ron, and Uncle Ho.:twobeers:

[LandyDude]

Yeah thanks. I also happened to found out the same thing that it's a 1-3/8" when I rang www.fwd.com.au (http://www.fwd.com.au) to see what they had.

And after a sweaty, cramped, fun job ... it's done.

Cutting a hole ended up being a pain. Wrecked two hole saws and ended up having to drilling holes around in a circle then filing it out to be a neat round hole. Even more fun getting out the old plug and then trying to get the new brass one in square.

https://www.aulro.com/afvb/images/imported/2010/01/58.jpg

To finish the job I moved the instruction plates over to the right a bit and put in a rubber plug.

https://www.aulro.com/afvb/images/imported/2010/01/59.jpg

Now I can keep an eye on it make sure it doesn't leak.

[d@rk51d3]

Nice job. :cool:

We get there in the end, hey?:D

[LandyDude]

We get there in the end, hey?:D

Yep we do. Thanks everyone for your help. :D

[foz.in.oz]

Well the moral of this story must be measure first as they must have used several different sizes depending on what was available at the time.

My one is definately 1 3/4" as can be seen in the photo. There also appears to be a smaller one next to it too.

[d@rk51d3]

Well the moral of this story must be measure first as they must have used several different sizes depending on what was available at the time.

My one is definately 1 3/4" as can be seen in the photo. There also appears to be a smaller one next to it too.

Just out of curiosity, is yours a 3 bearing, or 5?

[JDNSW]

Well the moral of this story must be measure first as they must have used several different sizes depending on what was available at the time.

My one is definately 1 3/4" as can be seen in the photo. There also appears to be a smaller one next to it too.

In my parts book (RTC9840CC) -

525497 (1)
250840 (2)
524765 (2)
587628 (2)
Alternatives (no sizes given)
So the advice to measure would seem to be definitely justified!

John

[incisor]

i have 3 motors sitting beside my carport and all three have a different size rear of block welsh plugs.

PIA

[drifter]

hmmm

my book says #250840 1 1/2"

You would be annoyed to go order one and find it was one of the others, wouldn't you?

My book also says only one of them back there.

[ian4002000]

Mine has a 1 3/8 brass cup in it.

[johnfriartuck]

hi if you have a slide hammer or can borrow one it will be easier to get out use a pick to make the hole foe the screw, a pick is an old philips screw driver that is ground to a point,my dad used newspaper around the plug to seal it,to use the pick you simply put it up against the plug and hit it with a hammer take care not to make the hole too big.john