Does anyone have a good picture and/or diagram of the MK I SU Carb setup? This would be for the 3.4 (mine is a 1957 3.4). Thank you

 

Maybe this would be helpful.
It looks very similar to my 68 340.

https://www.shannons.com.au/auctions...M5CWCWEC8IZ98/

 

Thank you. That is a very beautiful MK I!!! I was hoping for more detail on the carb and linage configuration.but thank you just the same.

 

I can take a picture of mine, it looks to be the same as what it in the photo.
What specifically do you need to know, it's sounds as if the linkage is missing or you're not quite sure as to where things go ???

I'm going to assume that you meant to say linkage and not "linage".
Or you meant to say lineage ?

 

Yes, linkage :-). I actually need to find replacements for my carbs. Was just hoping to get some good photos or diagrams.Thank you.

 

I have carbs from a mk2 in my mk1. The setup of the linkage is very much identical and you can get the missing parts from a mk2 which is easier to find. I do not know if my pictures is of any help though..

 

Thank you, that is perfect.

 

Those are nice to adjust, there are two return springs involved, a strong one for you foot and a weak one to keep both butterfly valves shut.
The red arrow screw is adjusted to take the load of the butterfly shafts.

When adjusting the idle and balance, the weaker spring holds both right shut at idle, you loosen the purple arrow screw on the coupling.
The weak return will then shut one butterfly valve and then you hold the other one shut by hand, and tighten up the coupling. (it doesn't matter which coupling or screw)

Idle and balance is achieved through the fine idle screw, green arrow, (there's one on each carb)

What happens to these is when the big spring is loaded onto the butterfly shafts and excessive wear occurs from not being adjusted properly.

You can get a throttle return spring kit from Burlen that replaces the light spring, this will cause even less wear on the shafts, you need one for each carb.
Unfortunately, they are out of stock, it's number 39 in the diagram.

Parts for AUD 241 for Jaguar 1946 onwards 340 Series 3442 cc - SU Carburetters - SU Carburetters