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MG MGB Technical - Window adjustment

Hi,

My 72 Gt has its doors pretty well aligned. However, the window seems to be catching the B post seemingly more and more. Any tips on what to do before I dive in and try and work out what's needed.

Thanks in advance
IA Jones

Hi Iwan - no doubt others will post more detail, but having recently reassembled GT doors, windows etc. I just wanted to say that you should find plenty of adjustment to things like the window channels, WITHOUT having to actually remove any fixing screws/bolts - reason being the designers factored adjustment in with elongated holes and adjustment room everywhere inside the doors.
There are the 2 adjusters hidden under plastic caps on the leading edge of the door, and the more obvious adjusting points attaching the window channels. Good luck! John.
J P Hall

You might like to have a look here http://www.mgb-stuff.org.uk/bodytext.htm#dropglass

There is some adjustment available, including of the doors, but I have to say that the two bolts under the caps at the front of the door are not one of them. These pull the quarter-light and its channel forwards tight against the door structure, as do the two long nuts on the studs that point downwards under the opening vent which pull it tight downwards. As such because they are virtually at right angles to each other and part of the same component, these four have to be tightened gradually and together to avoid distorting the door frame. You could space the quarter-light backwards and/or upwards with washers, but they were never used in the factory and in any case would only make things worse in your case.

The only adjustment on the quarter-light itself - apart from perhaps some slight side to side movement - is at the bottom of the front channel, which can be adjusted in a slot in the bracket to move the glass closer to or further away from the door seal when door and glass are closed.

The rear channel can be adjusted fore and aft, but as the front channel is fixed, and the glass width is fixed, this is only to set the depth of engagement of the glass in the two channels.

Apart from that, the only other adjustment as far as the glass hitting the B-post is concerned is to slide the door back and fore on its hinges, which will also change the shut lines at the front and rear edges.
paulh4

Does the glass catch the B post over it's entire height or just towards the top corner?
Allan Reeling

Hi, It just catches at the top corner.
IA Jones

Has the door dropped? - Adjust that.

Can you push the glass away from the B-post trim? - Check the rear channel upper screw is tight and the channel pushes onto the glass, and pushes the glass into the front channel, but not so much that the regulator become stiff.

Check the upper B-post bright trim is screwed down to the B-post itself, and isn't distorted in that it has moved closer to the glass than it should be.

Are the regulator fixing screws through the door inner skin tight?

What is the alignment of the top of the glass to the underside of the gutter trim like? It is parallel? Or is it lower at the rear?

A picture might help.
paulh4

Top corner catching if the door is properly aligned, i.e., stainless strips and swage line are in alignment, and the quarter light frame is nice and parallel to the A post, then it's an adjustment issue. With the glass up can you push it deeper into the quarter light channel?
As Paul said a picture would of great help.
Allan Reeling

Hi,

Thanks Paul and Allan and John, (Hi John by the way!) Anyway, you were all correct. So with some tightened quarter-light bolts at the front of the door. Pulling up the door with a tiny little lift up and forward of the door at the top hinge - probably less than an 1/8" and a little adjustment forward of the top of the rear window channel and hey presto .... done.

Cheers once again.

Iwan
IA Jones

Well played sir! It always amazes me how a tiny adjustment in one place can produce a more than adequate shift at the far end of the panel/door/window. Very satisfying when your door closes well, windows glide up and down, locks work smoothly ... time for a beer! Yours, John.
J P Hall

Jolly good. I spent ages trying to get my roadster drivers door right 27 years ago. In the end I gave up, but it always bugged me. Several years later I decided to have another go, and it came right in minutes.
paulh4

This thread was discussed between 29/10/2017 and 03/11/2017

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