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The Seven S4 (Type 60) chassis is actually comprised of a tubular structure reinforced by two sheet steel side panels that are spot-welded along the side and underside of the chassis. Once the chassis was stripped it was clear that here were signs of corrosion of the side lower tube below the sheet panel. Removal of both panels ( [link] ) showed only surface corrosion at this location. However, one of the upper side tubes was significantly corroded in the region of the engine bay and this had led to a 1 / 2 ” length hole. In addition to chassis lower tube the front box section had corroded resulting in the destruction of a significant portion of the lower half ( [link] ).

A view of the right hand side of the bare chassis.
Underside of front box section before media blasting showing significant corrosion.

Three of the four bolts holding the two steering rack clamps were readily loosened; however, the last (forward right hand side) sheered-off ( [link] ) and will have to be drilled out.

The front box section and steering rack mounting brackets (A) showing the single bolt (B) that sheered off while removing the steering rack.

Repair of chassis

All chassis repairs were undertaken by Lucas Racing and Restoration (Houston, TX). In order to ascertain whether there was any additional damage hidden by corrosion, the chassis was cleaned by Custom Coatings (Cypress, TX) using media (alumina) blasting ( [link] ). Importantly, the bronze welding used on the chassis showed no sign of damage due to either age or the fire ( [link] ).

The bare chassis after media blasting.
An example of the bronze welding used in the chassis construction.

As expected the front box section will have to be replaced ( [link] ). Happily, the only damage due to corrosion in the steel tubing appeared to be in the upper right side tube, the lower left and right sides. In addition, it was found that one of the upper engine cross members was cracked.

Underside of front box section after media blasting for comparison with [link] .
The upper right side tube showing a hole due to corrosion.

Repair of side tubes

The first issue was to make a jig to ensure that the chassis frame remains straight during repair. As such it was found that there was a slight bend in the chassis frame that will be straightened during repair. The small sections of the right side upper and lower tubes were repaired by cutting out a small area from the damaged face ( [link] ) and welding in a replacement section ( [link] and [link] ). A similar process was used for the engine upper member ( [link] ).

FIGURE. Schematic of the process for repair of the upper tubes.
The upper right side tube showing the repair section in comparison with [link] .
The lower right side tube showing the repair section in comparison after welding, grinding and painting with primer.
The upper left side engine brace tube showing the repair section after welding, grinding and painting with primer.

The lower left side required two separate sections to be replaced either side of one of the body-to-chassis threaded bobbins ( [link] ). One small section was removed in a similar manner to done for the upper tubes ( [link] ) then a new piece of steel welded in-place. The second, larger, section was cut out completely rather than just one face of the tube. Furthermore, it was cut at an angle rather than at 90° to the tube ( [link] ) in order to provide larger welding area. The finished section is shown in [link] .

Questions & Answers

where we get a research paper on Nano chemistry....?
Maira Reply
what are the products of Nano chemistry?
Maira Reply
There are lots of products of nano chemistry... Like nano coatings.....carbon fiber.. And lots of others..
Even nanotechnology is pretty much all about chemistry... Its the chemistry on quantum or atomic level
no nanotechnology is also a part of physics and maths it requires angle formulas and some pressure regarding concepts
Preparation and Applications of Nanomaterial for Drug Delivery
Hafiz Reply
Application of nanotechnology in medicine
what is variations in raman spectra for nanomaterials
Jyoti Reply
I only see partial conversation and what's the question here!
Crow Reply
what about nanotechnology for water purification
RAW Reply
please someone correct me if I'm wrong but I think one can use nanoparticles, specially silver nanoparticles for water treatment.
yes that's correct
I think
Nasa has use it in the 60's, copper as water purification in the moon travel.
nanocopper obvius
what is the stm
Brian Reply
is there industrial application of fullrenes. What is the method to prepare fullrene on large scale.?
industrial application...? mmm I think on the medical side as drug carrier, but you should go deeper on your research, I may be wrong
How we are making nano material?
what is a peer
What is meant by 'nano scale'?
What is STMs full form?
scanning tunneling microscope
how nano science is used for hydrophobicity
Do u think that Graphene and Fullrene fiber can be used to make Air Plane body structure the lightest and strongest. Rafiq
what is differents between GO and RGO?
what is simplest way to understand the applications of nano robots used to detect the cancer affected cell of human body.? How this robot is carried to required site of body cell.? what will be the carrier material and how can be detected that correct delivery of drug is done Rafiq
analytical skills graphene is prepared to kill any type viruses .
Any one who tell me about Preparation and application of Nanomaterial for drug Delivery
what is Nano technology ?
Bob Reply
write examples of Nano molecule?
The nanotechnology is as new science, to scale nanometric
nanotechnology is the study, desing, synthesis, manipulation and application of materials and functional systems through control of matter at nanoscale
Is there any normative that regulates the use of silver nanoparticles?
Damian Reply
what king of growth are you checking .?
What fields keep nano created devices from performing or assimulating ? Magnetic fields ? Are do they assimilate ?
Stoney Reply
why we need to study biomolecules, molecular biology in nanotechnology?
Adin Reply
yes I'm doing my masters in nanotechnology, we are being studying all these domains as well..
what school?
biomolecules are e building blocks of every organics and inorganic materials.
how did you get the value of 2000N.What calculations are needed to arrive at it
Smarajit Reply
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Source:  OpenStax, Lotus seven s4 (type 60): design, restoration, and maintenance. OpenStax CNX. Jun 07, 2013 Download for free at http://cnx.org/content/col11418/1.19
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