• Hi Guest!
    You can help ensure that British Car Forum (BCF) continues to provide a great place to engage in the British car hobby! If you find BCF a beneficial community, please consider supporting our efforts with a subscription.
    There are some perks with a member upgrade!
    **Upgrade Now**
    (PS: Subscribers don't see this gawd-aweful banner
Tips
Tips

fourth spring on throttle return?

Share this page

19_again

19_again

Jedi Warrior
Offline
Please see link down below.

If this works you'll be able to see the throttle bar, and at the end of the screwdriver the cotter pin is seen. at that same location is a small brown plate-like peice of metal with a hole as if for a spring, like a throttle return spring. also unseen but at the bottom of the heat shield directly below this device is a location for a fourth spring, the other three being the one for each carb, and another for the choke. I keep asking this question as my engine is slow to return from high rpms, I'll release the gas pedal and it could take a second or possibly two to drop the rpms to idle. This spring if it exists would of course return the throttle to dead idle quicker, IMHO. Thanks for any input.
 
Well, yeah there should be a spring there. You have other problems if the linkage is used in the condition of the photos. The lever pin at the carb link end is not in the proper part of that throttle shaft arm. The pin at the end ~should~ be in the "horseshoe" looking area. You can't be getting proper throttle movement the way it is.
 
Yup, I didn't see that, thought I had it all hooked back up proper. just took the carbs and shield off to retighten the new header bolts. The test drive was about 1 mile, that was enough. The fact that my rear carb return spring wasn't really engaged would also contribute to the slow return to idle, no?
So then there should be a spring for each carb, a spring for the choke and another for the center of the throttle bar? I wasn't sure that the hooking location for the fourth spring wasn't just a way to make the shield universal.
 
Indeed, the lack of spring tension on the throttle body will cause a dozy wind-down. Four springs, yup.

You could likely use the spring from the choke for a substitute on the throttle centre shaft 'til you get another, too.
 
I've got an order in with Tony for three new ones, I'll try to catch the order in time to add a fourth. I want them to all be of the same relative tensile strength.
Thanks again for the help, it's nice to have the forum to lean on and build my own knowledge base to eventually share. As far as having "problems", these are of course minor. I can't imagine what I'd do if I had to live with a Sikorsky in my back yard!!!
 
How about that thing that's pointing up in the circled area of the photos? Sorry, not sure what to call it. On my car, the end of it is up under the linkage for the choke.

If it's set up correctly in these pictures, it might explain some of the issues I've had over the years. Funny what you can learn while looking at other people's stuff.
 
Well, on an MGB that thing ~should~ be pointing outboard, and be under the choke linkage crossbar. That looks to be mounted "upside-down". The example here is a bit "tatty" as there's a great honkin' DCOE Weber replacing them. /bcforum/images/%%GRAEMLIN_URL%%/wink.gif
 
I'm standin here in the garage and lookin at your picture and my carb setup and indeed the DPO had it upside down, but being an MG, it still worked!!!!!!!!!!!!!!!! I put it back together the way it I got it but only after taking many pix before and during disassembly so I wouldn't screw it up. LOLOLOL
God these are marvelous machines aren't they?
 
My dear friend and an ex-pat Brit has always said: "Even half-right these cars will work in the bottom of a bucket of [censored]!"

He's right. And with a London Guilds Cert, he's ~credible~ too. /bcforum/images/%%GRAEMLIN_URL%%/wink.gif
 
yep, marvelous indeed.
 
Not to beat this to death or anything, but the Moss catalog says only three springs are needed: two for the throttle and one for the choke. What's the correct answer? I'm kind of in the same situation. My springs are old and getting weak.

Thank you,
-Bill
 
Originally that was the set-up. Two throttle return and the choke. My "over-engineering" with a third throttle shaft spring is borne of superstition and broken spring experience. Makes the pedal a bit 'heavier' but I go for redundancy. /bcforum/images/%%GRAEMLIN_URL%%/smirk.gif
 
H1s have a return spring on the front carb shaft at the front as well. Not sure about the later ones and mine are packed away.
 
DrEntropy said:
Originally that was the set-up. Two throttle return and the choke. My "over-engineering" with a third throttle shaft spring is borne of superstition and broken spring experience. Makes the pedal a bit 'heavier' but I go for redundancy. /bcforum/images/%%GRAEMLIN_URL%%/smirk.gif
Click to expand...

Would you mind posting a pic?
 
The photo above, Wm. The middle spring is on the throttle linkage for return, the fourth (choke) spring is not attached in the photo.
 
Back
Top