Cylinder block plugs on 1955 S1

[dobbo321]

Hello all
First post so bear with me

i have just purchased a 55 S1 86" ute cab. I am replacing the upper cylinder block welsh plugs, one was badly leaking. These are the 2 x plugs (look similar thread to 3/4 BSP) that screw into the block. They are located on the passenger side of the block. One in front off and one to the rear of the exhaust manifold. Both are inline with the 4 exhaust posts and slightly covered by the exhaust manifold when it is in place. I have fitted plenty of normal tap-in brass welsh plugs but am having trouble sourcing these screw in types of the right external flat shape so they don't fould the exh mani when it is refitted. Any help on suppliers or alternative ways of making them would be appreciated.
Cheers
Dobbo321
Baldivis WA

[digger]

was it this model engine that had a welsh plug that was interchangeable with bung off 44gal drum? I vaugely remember being told something but unsure--sorry! someone will know!


Oh and rules say PICS.. LOTS OF PICS!! :)

[123rover50]

Hello all
First post so bear with me

i have just purchased a 55 S1 86" ute cab. I am replacing the upper cylinder block welsh plugs, one was badly leaking. These are the 2 x plugs (look similar thread to 3/4 BSP) that screw into the block. They are located on the passenger side of the block. One in front off and one to the rear of the exhaust manifold. Both are inline with the 4 exhaust posts and slightly covered by the exhaust manifold when it is in place. I have fitted plenty of normal tap-in brass welsh plugs but am having trouble sourcing these screw in types of the right external flat shape so they don't fould the exh mani when it is refitted. Any help on suppliers or alternative ways of making them would be appreciated.
Cheers
Dobbo321
Baldivis WA

Just bought a tap for them at the Nambour swap last weekend.
1' by 16 tpi British Conduit they tell me. Bloke in gympie sells the Aluminium plugs but they are easy enough to make in the lathe. Cut a slot for a screwdriver, screw them in with some "Stag" and grind them off flush when tight.
Getting the tap to clean the holes is the hard part. I had been looking for months.

[chazza]

I cleaned the female thread with a thread file and bought the plugs from Dunsfold Land Rover,

Cheers Charlie

[RobHay]

They are called Core Plugs and there should be more than two of them. Check at the rear of the head you should find another one (well at least on the 2.25 engine there are) They should be a conduit thread. Brian Hjelm can supply the tread tap for them. Ph 07-33997033
There should be 1 @ 1 3/8th " which goes into the rear of the head & 4 @ 1" which fit into the top of the head.
Then there are three that go into the side, not sure of the sizes Rover part numbers 09191; 512412 & 527269. The first two are smaller than the last one.

You can purchase them from British Off Road at Nambour Ph07-54451094, Gary CLR on Ebay, The Old Landie shop in SA, Four Wheel Drives in Melb. plenty of people sell them. Best to do the lot and the welsh plugs whilst you can.

[Bigbjorn]

Brian Hjelm can supply the tread tap for them. Ph 07-33997033
There should be 1 @ 1 3/8th " which goes into the rear of the head & 4 @ 1" which fit into the top of the head.


No, I can't. I don't stock British Standard Conduit. Lack of demand. BSCon is a well and truly obsolete thread.

Damien White, 07-3807-0798, has a swag of new BSCon tools.

[d@rk51d3]

Whitworth will work, if you're in a pinch.

[Bigbjorn]

Whitworth will work, if you're in a pinch.

BSCon may be Whitworth 55 degree thread form, but 1" BSW is only 8 tpi. 1 3/8" BSW is 6 tpi.

[series1buff]

As a stop gap measure, you can use ordinary cup type welch plugs .. 1" from memory ..... it works . On my 107 years ago, I tapped the holes to 3/4" BSP and bought some plugs for the hardware store , used some teflon tape and it worked fine .

For the pedants out there: I have a lathe so can turn up some plugs in whatever thread . Just need time to perfect my thread cutting skills :eek: 4 wheel drives did sell them , made from aluminum , at a exhorbitant price .

MIKE

[chazza]

Check at the rear of the head you should find another one (well at least on the 2.25 engine there are) They should be a conduit thread.
There should be 1 @ 1 3/8th " which goes into the rear of the head & 4 @ 1" which fit into the top of the head.
Then there are three that go into the side, not sure of the sizes Rover part numbers 09191; 512412 & 527269. The first two are smaller than the last one.



Not the case on the S1 engines Rob.

09191 is a part found on a S1 but it screws into the block; there are no core plugs in the head,

Cheers Charlie

[Maffra]

Getting the tap to clean the holes is the hard part. I had been looking for months.

Some years ago a friend and I made one up in a lathe, hardened it and always worked a treat. Shouldn't be to difficult to do for someone proficient with a lathe. Probably still got it in the shed somewhere. Actually probably also still got the long piece we lathed up as well, which we cut the tap off and which would make up some more.
Regards

[Maffra]

Some photos of the tap made up some years ago for cleaning out the threads in the head where the plugs go as discussed.

First is the piece of round used. The thread used is on the right.

http://img704.imageshack.us/img704/8205/dscn6487g.jpg (http://img704.imageshack.us/i/dscn6487g.jpg/)
Uploaded with ImageShack.us (http://imageshack.us)

Second is the tap itself

http://img191.imageshack.us/img191/9031/dscn6490i.jpg (http://img191.imageshack.us/i/dscn6490i.jpg/)
Uploaded with ImageShack.us (http://imageshack.us)

Hope these are of some help. Sorry about the photo size . . . new to photos ! At least you can see it close up !
Regards

[dobbo321]

Thankyou very much to you all for your advice.
I will chase up the a thread file now I know the correct details, source the plugs and get them fitted. This vehicle hasn't been running for 12 years so am loking fwd to getting it firing.
Will keep you posted on progress

Thanks again
Rgds
Steve:)

[Bigbjorn]

I have now placed an ad in Markets under Hobby Equipment and Supplies for Sale. 1'" x 16 tpi BSCon tap and Dies. I have no financial interest in these. Contact the owner direct and haggle.

[Dinty]

G'day All, I know this isn't S1 but it's still along the same idea in this thread.
I had to replace one of the core plugs in my S2A 4cyl engine, the core plug supplied was undersize to say the least, anyway I made my own out of brass





I'm only a amateur, self taught on the lathe, anyway my job was a success, and I have had the BS Conduit taps set for probably 30 years hope thats of some help cheers Dennis
http://i659.photobucket.com/albums/uu319/DJM110/113-372CoreplugBrass001.jpg't=1282036071
http://i659.photobucket.com/albums/uu319/DJM110/113-372CoreplugBrass002.jpg't=1282036182
http://i659.photobucket.com/albums/uu319/DJM110/113-372CoreplugBrass003.jpg't=1282036270
http://i659.photobucket.com/albums/uu319/DJM110/113-372CoreplugBrass005.jpg't=1282036708
http://i659.photobucket.com/albums/uu319/DJM110/113-372CoreplugBrass004.jpg't=1282036771
http://i659.photobucket.com/albums/uu319/DJM110/113-372CoreplugBrass006.jpg't=1282036855
http://i659.photobucket.com/albums/uu319/DJM110/113-372CoreplugBrass007.jpg't=1282036910

[series1buff]

That's very nice work . What type of tool is that , a indexed tool ? I use the HSS tools I shape/sharpen myself on the grinder..... 60 degrees for most threads .

MIKE

[Bigbjorn]

Indexable insert RH turning tool, looks to be TPMR. TC inserts are wasted on brass. Cutting speed for TC on 25mm brass is 2000+ rpm more than most hobby lathes will run at.

60 degrees for metric, Unified, and BSC thread forms, 55 degrees for Whitworth thread form, and 47.5 degrees for BA.

[Dinty]

G'day All, That tool was in the toolpost so I used it (just lazy I suppose LOL) generally I use HSS for most jobs, I have HSS tools for different thread forms etc cheers Dennis