I am trying to restore a 1961 3.8 auto that had a fire in the engine bay and lost some parts. Can any body photograph the set up of the carb links to one another and to the throttle links, return spring(s). It needs a shot after removing the air filter so that am parts can be seen.
There was more than one set up as carbs were modified and improved together with general updating.
My carbs have small springs around each end of the butterfly shafts. If I try to add a return spring to the left hand side this appears to almost make it almost impossible to connect to the throttle arms as the starting carb is in the way!!!
So if any body can show me some pics I would be very indebted.
Other than that if they can name a publication or reference that shows the set up!!
regards barry

 

To add to my original request, but this may be easier to get a response.Where hd6's are fitted with coil springs fixed at each end of the butterfly spindle, is there a seperate throttle return spring attached to the shaft inbetween the carbs, or any other place.
In other words do these 2 coil springs return the butterfly to the closed position?
regards barry

 

Hello,

Every HD6 has one Coilspring .
They are fitted between the 2 carbs, just all most against the Housing.
On the oilfilterhousing there should be a eye for the other end of the springs.

regards,
Peter Jan

 

Hi Jan,firstly I have edited my scipt as there is only 2 springs not 4. I assume you mean the long coil spring!!. To what does it connect to on the carbs ? Is it the lever that connects the inlets together? or some other lever. Where does the actual linkage connect to
barry

 

Hello,
No there is a separate lever just for the (indeed) long springs.
It's attached on the spindle. See picture.
Regards, Peter Jan

 

thanks for the pic Jan, its still not clear from your pic, could you take a pic from a different direction, say from above.
Whats the weather like there in Holland, cold I expect?
regards barry

 

Jan, 1 last question. The carbs you pictured, I assume they are HD6's, do they have a spring coiled around the main shaft that goes through both carbs,butterflies are attached, with a connector in the middle?. The springs are to the rear of the rear carb to the front of the front carb!. These act as throttle return springs.
Or are the long springs the only throttle return, long to the middle, bottom fixed to bracket on oil filter, and a shorter one at the front secured to a 'Y' shaped bracket!
My search so far seems to show that there were different set ups, unique to each type of carb, and latter modifications.
Many thanks for your patience. Maybe I can help you at some time ,I hope!!
Best regards Barry

 

Peter, sorry Ive got your name wrong. I have taken some photos, but I dont know how to send them, Ive asked 'Admin' how to do!!!!!!!!!
regards barry

 

Barry,
I'm also working on a 61 3.8 sedan. If you need pix as you go, let me know.
Joe
https://www.jaguarforums.com/forum/m...project-80737/

 

Here are a couple of shots from a '65 Mark 2. The only return spring I'm aware of is the long one that attaches to the camlike lever on the shaft at the forward carb. This is at right in the first pic viewed from above and at left in the second looking from below. Sounds like your setup might be different.

 

Hope this helps in some way

 

i'm sure it does help...but unfortunately, it doesn't clearly show the two springs at the OUTER ends of the throttle shafts on each carb.
remembering that the throttle shaft on each carb runs completely through the carb and its butterfly.

my mk2 with the original carbs has one a very long spring attached to an arm clamped to the co-joined throttle shafts. the arm is near the AED and between the two carb bodies. the other end is attached to a dedicated bracket mounted on the what is possibly the fuel pump or possibly the block. the spring must be 6" long or so.

the other two springs are at the outboard ends of each throttle shaft of each carb. as noted above the throttle shafts run completely through their respective carb bodies. they are clamped together at two places somewhere between the two carbs.

on my '67 mk2 those two springs are encased in a protective metal shroud that looks to be part of the carb body, such that the individual coils in the springs are not visible. i've verified this by removing the long unsheathed spring that runs from the arm clamped on the throttle shaft to the block/fuelpump and blipping the throttle shaft by hand. when doing so, the throttle snaps back immediately, indicating to me that the springs at the ends of the throttle shaft are in working order.


there is also a spring ath

there was often an additional, and often very long, spring attached to an arm coming off the co-joined throttle shaft. at some point between the carb bodies as a safety precaution and provide additional force. so all in all i've got three springs attached to my duel HD6 carbs on my mk2. two coil springs at the outer ends of my co-joined throttle shafts and another one anchored to an arm clamped between the carb bodies and by necessity near the choke carb that is attached at the other end somewhere on the block or a bracket six or eight inches away from the carbs. ...it's a kludge, that's for certain.

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