*HELLO TO OUR FRIENDS FROM THE FUTURE ONCE MORE*
*PLEASE NOTE, IF YOU INTEND TO EVER FIT AN O2 SENSOR, NOW WOULD BE THE TIME TO MAKE SURE YOU CAN REMOVE THE BUNG, POSSIBLY ASSISTED BY HEAT FROM STARTING THE ENGINE - BEFORE YOU REMOVE THE EXHAUST*
With some better light Thursday morning, I assessed the clean dry bottom.
I spent a good amount of time experimenting with various tools including a heat gun, paint scraper, putty knife, putty scraper and ended up using a little window scraper that takes a Stanley blade. This was the best combined tool for getting the old undercoat off, and scraping down the rust; big enough to do decent areas, but small enough to get in around bolts.
Daunting though it seemed, I initially decided to break it into chunks and work just on getting the back wishbones and anti-roll bars cleaned and rust-treated.
This is a view of the back offside wishbone assembly after an initial scrape:
This picture shows the underbody coating coming off. It also shows the main issue I have here; while I am taking off a lot of good underbody coating, on every panel there are small dots of rust to be found. The only way to stop it in its tracks is to clean all the waxy crud off every panel, expose the rust and treat it:
Its only really surface rust and pitting. I worked down each wishbone to the centre and then up into the guts of the car, finding this at the top of the offside wishbone:
This looked a bit more serious.
To get to it properly, I decided it was time to remove the old silencer. A little judicious application of WD40 on one, and just heat to the other, meant the U-clip came off pretty easily. So far so good:
However, separating the silencer from the main pipe proved more tricky. The car had failed the emissions part of its MOT on emissions and my mechanic had told me the exhaust was a botch job - well he was right. The photo below shows the depth the pipe went into the silencer feed pipe (where the rope is on the left, about 6 inches!
I tried everything; removing the bolt holding the silencer on from inside the boot:
And during which, I discovered the original Lotus toolkit, a brand-new-looking NOS spare wheel & tyre, and all the original jacks & tools with very little rust.
I tied straps to the wheel ramps, heated it for 10 minutes with the heat gun, booted it, had guys with ropes pulling from either side while I hammered screwdrivers down the gap; it wasn't going to shift.
Eventually I gritted my teeth and hacksawed the old exhaust off. I was that p*ssed off with it, I wouldn't even bother trying to clean and sell it.
Unfortunately I decided to saw where there was easy access at the end of the centre pipe. It took about 25 minutes of hard sawing, and then I discovered I had too much pipe, blocking me from turning the silencer enough to get it out!
It was getting dark and I went home, revised the manual, deciding to remove the back bumper, which is only held on at the bottom by one bolt at the moment anyway! More on that later.
When I got in the next day, it was obvious that this was going to be too complex, and so I set to with a hacksaw again. Finally the silencer was out!
At this point I set to with renewed vigor, scraping as hard as I could, taking care round rubber parts and hoses, and started to remove all the underbody coating and surface rust from the centre section, antiroll section and wishbones. Looks pretty ugly, but its not too terrible. I had to stop regularly as even with safety goggles the amount of cr*p and dust getting in my mouth and eyes was pretty foul.
This was an interim picture taken to show progress. You can see the rust very clearly.