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chassis steel thickness


 
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andyman



Joined: 08 Dec 2012
Posts: 5601
Location: Penrith

PostPosted: Fri Jan 20, 2017 19:50    Post subject: chassis steel thickness Reply with quote

Just been cleaning dripping oil off the alternator wiring and connector ,(rear half moon seal needs sorting), and noticed that the chassis sections are made from 2mm thick steel. Is the L400 chassis made from the same stuff?
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Andy W



Joined: 03 May 2015
Posts: 559
Location: Brighton

PostPosted: Tue Jan 24, 2017 14:41    Post subject: Reply with quote

The rear chassis on my van when I had to replace it was 1.5mm, don't know if the front is a different size.
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YOZA



Joined: 07 Mar 2005
Posts: 2423
Location: The centre of the universe

PostPosted: Sun Feb 12, 2017 13:42    Post subject: Reply with quote

You will find it is different thicknesses all over, when the chassis parts are fed into a press they are all the same gauge when flat, but when the press forms the section in the die the thickness in parts can decrease by up to 70%.

Imagine placing a sheet of Plasticine over a wooden block then press down with a die that is the female of the block, you will find thinning were the 90deg forms are along the panel.

When running a large batch of chassis parts/sections/channels you would often be alerted by the operator of cracks and splits, this was usually a lubrication or setting issue, but it was always 100% on the stretched formed line as it thinned out, you will find that these thinned areas are the first areas to rot and break through.

Chassis parts are usually reinforced with filler plates and channels at stressed points, these are then spot welded inside the channel, a good example is the jacking points on a car have 3mm thick jacking reinf brackets welded to the inner sills.
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andyman



Joined: 08 Dec 2012
Posts: 5601
Location: Penrith

PostPosted: Sun Feb 12, 2017 14:10    Post subject: Reply with quote

Ironically, it appears to be these reinforced sections, which are stronger when new, that become a moisture trap and rust incubator on older vehicles. Having crawled all over the underside of an L400 last week, the relative complexity of construction and forming of the box sections compared to the L300 corroborates YOZA's comments about the effects of stress and stretch in the press- forming process, and the number and positioning of welded reinforcements.
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