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I got a ball and chain type servo for my 1977 corvette. NOS part from a Buick of the same year. Problem is, chain is too long. The pictures show its length, and the cable is already hooked up to the carb at rest position.
what is the solution? I have #10 connectors, I just don’t know if I need any slack in the chain or if it’s supposed to be an even firm line from cable to chain to servo.
I really can't see what is going on by the photos you provided...
From what I understand you are trying to adapt a Buick servo to your 77...
Here is a photo of my 1977 Servo, looks like a total of 7 links...
Just don't cut any chain until you are sure the cable is adjusted correctly...
Here are the instructions from the 1977 Service Manual...You do have a copy of the Service manual...Yes?
Last edited by bmotojoe; Aug 29, 2023 at 12:16 AM.
Yeah, sorry. This is what I needed, but the photo I sent with me holding the chain shows that it’s way too long.
My grandfather found his manual and is sending it to me, I just don’t have it yet. But anyways, when adjusting this chain should the servo be sucked in?
Im trying to find articles and information on how the vacuum works, and if the servo sucks in when the car is on and only pulls back when cruise is engaged?
you helped me a while back, I’ve found NOS parts for all of this and every component of the system works I’m just trying to adjust it and set it up correctly before I take it out on the road.
took vacuum all the way down in the servo with throttle cable at straight/tight position at carb.
No vacuum when you adjust the cable, just a tiny bit of slack. You don't want any pull that would possibly mess with the throttle plate position. That's the reason for the slack.
Post a photo of the side of the carburetor where the cruise cable attaches.
No vacuum when you adjust the cable, just a tiny bit of slack. You don't want any pull that would possibly mess with the throttle plate position. That's the reason for the slack.
Post a photo of the side of the carburetor where the cruise cable attaches.
this is with the vacuum released from the servo. Now the ball and chain hangs. I guess what I’m wondering is, when you crank the car, does the servo suck in? Making the ball and chain straighten up, and then when cruise is engaged the servo is pulled back by the cable?
To me, if the servo sucks in when the engine is turned on, I don’t know how to get the right chain length unless I pull vacuum with it match the chain to the cable.
this is with the vacuum released from the servo. Now the ball and chain hangs. I guess what I’m wondering is, when you crank the car, does the servo suck in? Making the ball and chain straighten up, and then when cruise is engaged the servo is pulled back by the cable?
To me, if the servo sucks in when the engine is turned on, I don’t know how to get the right chain length unless I pull vacuum with it match the chain to the cable.
That's where I thought you had the Cruise Cable connected, that is incorrect!
Here is the correct part and where it should attach...
The place where the cable is attached to now is for your throttle return springs...See the nylon bushing in the hole?
Change your spring to go from where it is on the carb to the red arrow hole of the support bracket......
You can pick the 5/16 x 18 threaded coupler up at Lowes, HD or Ace for under $3.00
If you have any questions on what parts you need to fab up the cruse stud, ask away...
Okay cool, I’ve got the setup right. Now I just have to figure out how the cruise works. 1. When the engine comes on, is there vacuum at the servo? 2. Still trying to understand your explanation of adjusting the chain length. With the cables and spring on the carb fixed and the cruise cable in there, there’s still way too much chain.
You just going to through crap like that on your Grandpas vette?
The geometry of that is not going to work...
You can do better than that!
I didn't take the time to get you accurate measurements for the hell of it...
Until you get that straightened out I'm done here...
hey Joe I don’t why every time you interact with me, you are some purist *******. This is my corvette that I bought from my grandfather to keep it alive.
Your accurate measurements don’t ******* work here, so I’m trying my best to ask you how the servo works.
you haven’t answered either question about when the servo actually activates. Rather find someone else than deal with **** advice. No one asked you to send “probably 7 ball links” for the hell of it, and again, it’s obviously not working for me.
I fixed the carb springs like you said, then asked about what to do next. But again, you question what I’ve got going on.
I CANT ACCURATELY MEASURE IT BECAUSE I DONT KNOW HOW TO SET IT TO BEGIN WITH.
THE THROTTLE CABLE IS AT THE RESTING POSITION, SO IS THE SERVO… HOW TF DO YOU MEASURE IT PROPERLY.
“A little slack…” doesn’t tell me much. The last time we spoke, you did the same BOOMER ****. You said I wasn’t giving it my best effort.
You told someone in another chain “2 inches of chain”, that’s what I started with before taking your advice here that YOU gave me and then said I’m NOT DOING MY BEST.
im out.
SERVO CHAINS LOOSE, THROTTLE CRUISE CABLE TIGHT AT REST. IF ANYONE OTHER THAN BOOMER JOE can help me, please do.
Also for the record Joe, measurement wise… the suspension that I just rebuilt myself with no prior knowledge passed all points at the mechanic shop.
so before you ruin other people’s hope on this forum with your Boomer *** attitude towards young people, consider that some of us love these cars because we have a dream and passion to keep them on a road. Think about that next time you think someone doesn’t “do better than that..” you have no clue what I’ve put into this car.
First off, I have nothing against young people...Young people are our future...
The reason I haven't answered your question yet on how to hook up the vacuum, as soon as I do your going to jump in the car and take it for a test drive.
What I'm seeing your setup is not ready for that yet...
Am I wrong?
Servo 1977 ball and chain length
