Welcome to our resource for MG Car Information.
MG Midget and Sprite Technical - Bent Chassis?
The other day I notice that the front chassis section seems to be bent a couple of degrees upwards and I would like to find out if this is normal.
I have attached a picture to help explain.
I cannot see any other signs of stress in the metal around that area, but if someone knows if this part of the design I would be very grateful to be told that, otherwise I'm not sure what to do to straighten it out.
|Here is the picture and the angle is symmetrical on both chassis rails by the way!
|Normal and necessary.|
The upwards bend of the front of the chassis rails is what sets the castor angle for the front wheels. It should be around 3 degrees, and start just behind the rear of the two inner suspension pivots.
|In your other photos, you appear to have cut out and removed the sill without first putting any bracing in across the door opening. Not essential, but usually advisable. I would suggest that you re-hang the door before putting the new sill in, and use that as the template to set the position and relative angles of the sill, A post and B posts.|
|Hi Guy, |
Thanks for the confirmation, now I can relax a little!
Regarding the sills you are correct and I haven't braced it for a very good reason, it was already out by several millimetres, as a previous prior owner had attempted to fit new sill and the door on the offside didn't fit at all!
The nearside isn't much better as the A post has been badly repaired, making the door gap 4 millimetres too small also.
The plan is to fit the new sills as you describe, around the doors!
I saw someone had a photo of an adjustable tensioning bar that they used to get everything square before welding in the sills. I thought that was something I would try out.
|Here's what I used. One top and one bottom. A bit crude but it did the job with fine adjustment by turning the adjusting nuts.|
The other "variable" to watch out for is that you get the same length of sill in front of the leading edge of the A post as you have in the length of the front wing! Sounds obvious, but is easy to miss!
PS, I like your website!
|That's the one!! I had a feeling it was you.|
Thank you for the tips!
This thread was discussed on 02/04/2013
This thread is from the archive. The Live MG Midget and Sprite Technical BBS is active now.