I believe the shop manual refers to the vacuum dash pot on the throttle relay lever as a check valve. I have finally corrected the other vacuum leaks in the A/C heater system only to find the vacuum unit on the throttle linkage will not hold a vacuum. My question is, does this diaphragm have a calculated bleed or is it supposed to be vacuum tight? Mine is working with engine vacuum but I can't draw a holding vacuum with my mighty vac hand pump. Thanks.
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It should hold vacuum, and when the engine rpm's drop, the vacuum drops, allowing the plunger to come back out.
I have a good part, just send me an email; russ85747@hotmail.com
Just to add to the discussion, Cadillac replaced the vacuum fed check valve early during the 1964 model production run, with a spring and orifice type dash pot. According to the serviceman bulletin they went to the dash pot "to prevent stalling after sudden release of the accelerator pedal." according to the Serviceman Bulletin. I've got both the vacuum check valve and spring and orifice dash pots. If you wanted to switch over to the spring and orifice dash pot you would also need the throttle relay bracket it attaches to.
Thanks guys!
Jason, is upgrading to the 64 design a remove and replace bolt it in, connect the linkage and go task? I like the prospect of eliminating a future vacuum leak if it is R&R then go. Thanks.
Started by Dave Fehrle in 1963/64 Cadillac Specific Discussion. Last reply by Russ Austin yesterday. 3 Replies 0 Likes
I have finished replacing all the rear suspension and am at the last item, which is bleeding the rear brakes. I am using the Jason Edge vacuum pump method and all went well with the rear passenger…Continue
Started by Phillip Hill in 1963/64 Cadillac Specific Discussion. Last reply by Dennis P. DiBari on Wednesday. 8 Replies 0 Likes
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Started by Mack in 1963/64 Cadillac Specific Discussion. Last reply by Dennis P. DiBari on Tuesday. 6 Replies 0 Likes
So… I do have a few of 63 Coupes, all have same setup with carbs, Pertronix, shroud, new US Radiator radiators etc … but only one of them gets a bit hot when I am hauling faster than 60mph and car…Continue
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Posted by SK on June 2, 2025 at 2:20pm 2 Comments 0 Likes
Could someone post front and back photos of the 1963 right-hand kick panel with A/C?
My car didn’t come with the original kick panels, so it's a bit of a mystery to me how I should cut the backing board and carpet to fit around the A/C.
Many thanks,
-Samu
Posted by Chase on March 12, 2025 at 2:05pm 14 Comments 1 Like
Hey guys,
I have installed the same Edelbrock carb and have done everything the same as Jason’s carb and intake project. In the spring and summer months the car starts, runs and idles great! In the fall and winter months on a cold start, the car starts awful and wants to die until it warms up. I have to keep my foot on the throttle until it warms up or it will idle just terrible and try to die. Once it’s warm, it runs fantastic! Whats going on here? I was thinking of removing the…
ContinuePosted by Ray Schick on August 22, 2024 at 6:25pm 2 Comments 0 Likes
I bought this seat material thinking that it’s…
July 20, 2025 from 8pm to 9:30pm – Zoom
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