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.

Views: 33

Reply to This

Replies to This Discussion

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.

David 

Glad you found the vacuum valve not working correctly and asked about it 

You can just plug any vacuum line you may find leaking until you get to the repair 

It helps the rest of the system to perform as intended 

As the intake manifold is the source of all vacuum any vacuum leak in the cabin or engine can effect the engines performance directly to lean the engines fuel mixture 

Check your vacuum advance for holding vacuum if by chance you have not 

Enjoy 

RSS

Photos

  • Add Photos
  • View All

Forum

Thermostat

Started by Vito64Deville in 1963/64 Cadillac Specific Discussion. Last reply by Kevin Campbell 6 hours ago. 18 Replies

For a 64 min A/C Deville - what is the correct temp thermostat. I'm going to replace mine and notice there are several temps offered.

Classic Cadillac Parts For Sale - Misc Items

Started by Jason Edge in For Sale. Last reply by Jason Edge 10 hours ago. 175 Replies

I have posted a few Misc items over on my Classic Cadillac Parts Facebook page at…Continue

Tags: classic cadillac parts, classiccadillacparts

Current 1963/64 Cadillac Listings on eBay

Started by Jason Edge in For Sale. Last reply by Jason Edge 12 hours ago. 0 Replies

To see all 1963/64 Cadillacs Listed on eBay in the USA…Continue

Tags: ebay

Ordering Polyurethane Replacement Trailing Arm Bushings

Started by Dan McNarry in 1963/64 Cadillac Specific Discussion yesterday. 0 Replies

There seems to be growing interest in the poly bushings. In order for me to keep track of who wants bushings, please send me a message along with or in lieu of a reply to either this thread or the…Continue

Blog Posts

How to sensibly deal with the Corona Virus

Posted by Jeff Kinzler on March 14, 2020 at 5:02pm 6 Comments

https://theamericanscholar.org/covid-19-a-primer/

I found this very helpful, written by a knowledgeable authority in public health. 

Remember, Viruses are not spread by Cadillacs so get out and drive!


Safe & Healthy travels. 

Jeff Kinzler

1963 Eldorado convertible boot

Posted by Les Eastling on February 27, 2020 at 10:33am 1 Comment

I need a used convertible boot for a 63 Cadillac convertible - condition or color is not an issue since it will be used as a pattern for making a new one. One from either a 62 series convertible or an Eldorado would work. I know I am searching for hen's teeth here... but you never know unless you ask!

Looking for 63 Convertible / Coupe rear side trim

Posted by Gene McIlroy on January 24, 2020 at 12:18pm 0 Comments

Want to find a good straight dent free rear side trim for my 1963 Convertible.  I have both sides but they do not match.  Wanting to get them to match.  I am attaching a photo of the two trim sided that I have really wanting the squared off trim if I can get it.  Let's see what you have,…

Continue

Videos

  • Add Videos
  • View All

© 2020   Created by Jason Edge.   Powered by

Badges  |  Report an Issue  |  Terms of Service