JowettTalk

We have frequently used POR but really to seal against further rusting. I do not know if it will seal leaks or how big. The marketing says pinholes.
We fix any leaks with lead. Obviously thoroughly flush and rattle some rocks around inside.

When I restored the fuel tank in my Jupiter (E1SA433R) it had a lot of internal rust through sitting empty for decades, but no holes. I used the age old method of sharp rocks and lots of bolts to loosen the rust, then washed it out many times, dried it very thoroughly, and then used a POR15 Fuel Tank Repair Kit which involves three processes: prep, cleaner, and sealer. POR15 will stop the rust, corrosion, and seal any pinhole leak, and the fuel tank will be impervious to all additives and modern fuels. I also used POR15 Gloss Black Rust Preventative paint brushed on the outside as it provides a full gloss, perfectly smooth finish that is hammer tough. In fact, my chassis is sprayed in a POR15 product. POR15 is unlike any paint that I've used before, and while it is quite expensive, the results are amazing - don't get it on your skin though, because it doesn't come off!

Cheers,

Andrew Henshall
JCCA, JCC & JOAC member

Nothing to do with Jupiters or their restoration, but good to hear from you again Andrew, and all the best for 2023.
Tony.

I've used slosh tank sealant on a number of cars. For the most part the result has been good. The older sealant had a tendency to flake off when the ethanol content of fuels increased and I experienced that on one tank. I understand that the new versions are ethanol safe.

Several years ago, I made a 'running repair to my Jupiter tank which has not been internally sealed and which had developed a small leak from a pinhole. I drained the tank and used an epoxy putty to seal the hole from the outside, without removing the tank. I intended this to be a bodge until I could get a new tank made in aluminium. I commissioned a tank via Tom Chapman, who sadly died before the it was delivered and I never knew the supplier's name. However, the epoxy fix is going strong 5 years later. I check regularly and it shows no sign of a leak.

The POR tank sealant kits are excellent - I've been using them for many years and every vehicle that goes through my workshop which uses the original fuel tank is treated with it regardless to if its leaking or not - reason being is that once the kit is used it will seal all internal areas and prevent any further particles / foreign debris etc being released from the internal faces of the tank and into the fuel lines / system / carburettors etc

I am welding up rust holes in my jupiters exoskeleton
The steel I think is 1/16 th of an inch approximately.
Does anyone know what the dteek thickness was meant to be? By the varying sizes I am thinking they used what ever was laying around.

The thickness was carefully chosen based on complex mathmatical calculations using finite element analysis.

Are you are referencing the tube frame? It's 16 gauge chrome moly on the main tubes and 18 g on the 2" tubes. The original weld rod was 2.5% Cr/.5 to 1% Mo.

I'm surprised there are holes to be welded!

Chassis is fine. Its the frame that holds the alloy panels.
It seems to have had many repairs in the past. Drivers side(lhd) seems to have had the most the panels around the rear door post all seem distorted.

For those people not sure, these are the same gauges after a rebuild.

David, Did you restore? If not, then please reference company in the Services section of JT

I did not restore them. A company called Liknel Otto instruments did. The only real struggle was the clock, as it was an absolute pile of rust

Is it normal for jupiter amp meters to have discharge on the right& charging on the left of the gauge face? Seems odd & counter to every other gauge I have seen.

Hi David -you are right, it is odd. I don't believe it is the correct gauge for a Jupiter. It should read the other way and have square 'pips' to indicate graduations on the scale, very much like the fuel gauge etc. If you do a Google image search on 'Jowett Jupiter Dashboard' you will see what I mean.

John