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MG MGB Technical - Demister hose connections

72 Roadster - If anyone has rebuilt the demister hose assembly I could do with some tips.
1. How do you ensure the tube which fits into the heater outlet stays fixed? A bit of silicone sealant?

2. The Moss diagram clearly shows the 'demister elbow', which connects to the above tube, with its flanged end towards the heater. This then relies on a push fit onto the solid tube and having tried it this way the whole assembly is sloppy to say the least, particularly the connection to the flexible demister tube. Has anyone tried it the other way round? i.e. with the flanged end connected to the flexible tube? You get a good tight push fit to the flexible, and the tube to the heater can then be clamped with the provided clip. I've attached a photo of the alternative(left) & normal which may help in understanding my thoughts.

3. What is the purpose of the flanged end on the demister elbow? It looks as if it's designed to fit through a bulkhead which I certainly don't have. Perhaps this was applicable to a midget/Sprite?

4. At the demister end I think a simple push fit should suffice. Any comments?

Richard Coombs

>1. How do you ensure the tube which fits into the heater outlet stays fixed?

In my case, with great difficulty. I had to fiddle with it a lot and say choice words, but finally got it to stay in place long enough to get it all assembled. A bit of silicone sealer would probably be helpful.



>2. The Moss diagram clearly shows the 'demister elbow', which connects to the above tube, with its flanged end towards the heater.

This is correct.

>3. What is the purpose of the flanged end on the demister elbow? It looks as if it's designed to fit through a bulkhead which I certainly don't have. Perhaps this was applicable to a Midget/Sprite?

See the photo. It fits into the panel that screws to the bulhead behind the radio console (indicated as "10" in the pic).

>4. At the demister end I think a simple push fit should suffice. Any comments?

IIRC, that's all I did when I did mine.

HTH!


Rob Edwards

The flange looks like it pushes into the cabin side of the doible-skinned firewall, the tube then going through the gap and the second skin of the firewall, then the rubber block up to the heater port, see the attached from Clausager of the cut-away GT at Gaydon. Bear in mind this is a 67 though.

PaulH Solihull

Thanks Rob, Paul.
Rob, where did your picture come from? Needless to say I don't have panel number 10 but I might make something up if it helps with fixing/appearence.
Richard Coombs

It came from the MGC service manual, but it shows exactly the setup I have on my '69 B. I think the NA spec '72 setup may be slightly different, but your pictures show exactly what I have on my '69 so I guess they kept the older setup for home market cars.
Rob Edwards

This thread was discussed between 04/11/2011 and 05/11/2011

MG MGB Technical index

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