Rear suspension beam

Moderator: The Midas Forum Staff

Rear suspension beam

Postby oldnut45 » Sat Apr 07, 2018 1:16 pm

Could anyone clarify if the drawing that is shown on the download section of the owners club website is for a MK1? The beam I have just taken off my car is shot and in need of replacement and looks very similar dimensionally as the one depicted in the drawing but thought it best to check.
oldnut45
 
Posts: 16
Joined: Thu Apr 05, 2018 3:46 pm

Re: Rear suspension beam

Postby Stuart » Sat Apr 07, 2018 1:22 pm

Hi Graham, welcome to the forum, I can confirm that the drawing is indeed for the MK1 and MK2 Midas, worth noting that the Midas rear track is narrower than a Mini just in case you look at Mini dural-beams as an alternative.
User avatar
Stuart
 
Posts: 1664
Joined: Tue Dec 02, 2008 8:29 pm
Location: Derbyshire

Re: Rear suspension beam

Postby oldnut45 » Sat Apr 07, 2018 3:15 pm

Thanks for that Stuart
Just reading the manufacturing notes given with the drawing and would like a further clarification. Under the section , suggested welding procedure , it mentions allowing about 6/7mm pull in and not sure what this refers to.

Graham
oldnut45
 
Posts: 16
Joined: Thu Apr 05, 2018 3:46 pm

Re: Rear suspension beam

Postby ACourtney » Sat Apr 07, 2018 5:44 pm

Hi Graham,

Welcome to the forum. Metals always shrink after welding - they expand as the heat is applied and then shrink such that they are shorter than when you started. 6 to 7mm sounds quite a lot though as the usual allowance for steel is 1mm per metre length per weld run, but that might be the difference between hot and cold. Another effect could be if the weld is only applied to one side of a beam/channel section, then it will tend to go banana shaped as it cools (a trick used to get negative camber on live axles is to run weld along the top!).

Alistair
User avatar
ACourtney
 
Posts: 430
Joined: Thu Dec 04, 2008 12:22 pm
Location: Oxford

Re: Rear suspension beam

Postby oldnut45 » Mon Apr 09, 2018 8:38 am

Has anyone fabricated this beam and have they encountered any problems? As the beam is to be hot dipped galvanized after fabrication should allowances be made when welding the outer plate fixing bracket to ensure it will "fit" over the channel beam as there will be the thickness of plating to consider?

Graham
oldnut45
 
Posts: 16
Joined: Thu Apr 05, 2018 3:46 pm

Re: Rear suspension beam

Postby ACourtney » Mon Apr 09, 2018 7:12 pm

I have had some Metro and Mini subframes galvanized and my experience is that the clearances don't change that much. However, sometimes the surface finish is not that great - seems to be worse for galvanizing done in the winter months - and I have had to file smooth the areas where the rubber seals on the fulcrum pins seat. Put that another way - I failed to smooth the area once and the rubber seal broke before I had got as far as installing the subframe assembly onto the car.
User avatar
ACourtney
 
Posts: 430
Joined: Thu Dec 04, 2008 12:22 pm
Location: Oxford


Return to Mk 1

Who is online

Users browsing this forum: No registered users and 2 guests

cron