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wgb1956

Re: Radiator Cap

#11

Just popping in

I am also looking for a 12 or 13 lb pressure cap. My 1953 has a 1" deep filler neck, not the standard 3/4" that most other vehicle brands seem to have used.
Does anyone have a 13 lb. cap cross-reference number that will work for this 1" depth? (Or a good used cap to sell?)
I can find 13 lb/3/4" depth caps, and 7 lb/1" depth caps, but not the 13 lb/1" variety.
I believe the numbers listed in the Packard cross-reference list are for 3/4" depth. (Did Packard use both 3/4" and 1" deep radiator necks from 51-54? Both radiators I have are 1" deep).
Many thanks for the assistance, as always.

Posted on: 2024/6/20 10:10

53 Cavalier

Re: Radiator Cap

#12

Home away from home

Quote:

wgb1956 wrote:
I am also looking for a 12 or 13 lb pressure cap. My 1953 has a 1" deep filler neck, not the standard 3/4" that most other vehicle brands seem to have used.
Does anyone have a 13 lb. cap cross-reference number that will work for this 1" depth? (Or a good used cap to sell?)
I can find 13 lb/3/4" depth caps, and 7 lb/1" depth caps, but not the 13 lb/1" variety.
I believe the numbers listed in the Packard cross-reference list are for 3/4" depth. (Did Packard use both 3/4" and 1" deep radiator necks from 51-54? Both radiators I have are 1" deep).
Many thanks for the assistance, as always.

I haven't had to go looking for a radiator cap for my 53 Cavalier, but it does have a 1" filler neck as well. When I look at a couple of the radiator caps on the cross-reference list for a 53 they are for a 3/4" neck. Maybe something that should be reviewed and updated, unless some 53's did have a 3/4" neck. Max Merritt lists a radiator cap for $50. Ouch!

Posted on: 2024/6/20 11:31

todd landis

Re: Radiator Cap

#13

Home away from home

ebay.com/itm/315289934441?itmmeta=01J0VC ... kLwxuXiUlfOm%7Ctkp%3ABk9SR_CItOyGZA

Might give this a try, does not say how many pounds.

Posted on: 2024/6/20 12:56

53 Cavalier

Re: Radiator Cap

#14

Home away from home

Quote:

todd landis wrote:
ebay.com/itm/315289934441?itmmeta=01J0VC ... kLwxuXiUlfOm%7Ctkp%3ABk9SR_CItOyGZA

Might give this a try, does not say how many pounds.

Velvac shows that as a 7 lb cap.

Posted on: 2024/6/20 13:56

wgb1956

Re: Radiator Cap

#15

Just popping in

Yes, the Velvac catalog only has 4 and 7 lb at 1” depth.

Posted on: 2024/6/20 15:20

BigKev

Re: Radiator Cap

#16

Webmaster

A RC-6 is a 13lb cap. The specs show a cap depth of 24.4mm which .961 inches.

Posted on: 2024/6/20 16:06

-BigKev

1954 Packard Clipper Deluxe Touring Sedan -> Registry | Project Blog

1937 Packard 115-C Convertible Coupe -> Registry | Project Blog

53 Cavalier

Re: Radiator Cap

#17

Home away from home

Quote:

BigKev wrote:
A RC-6 is a 13lb cap. The specs show a cap depth of 24.4mm which .961 inches.

+

I looked at that as well, but the filler neck height is shown as 19.5 mm or 3/4". I think 24.4 mm is the total cap height.
partshawk.com/acdelco-rc6-radiator-cap.html

Posted on: 2024/6/20 16:14

wgb1956

Re: Radiator Cap

#18

Just popping in

As an update, I was able to locate a 13 lb cap for my 1953 that is the correct depth to reach the bottom of the filler neck. Here are some comments on that cap:
- Sold by the U.K. by complete-radiator-supplies, on U.S. eBay, under the title 13 lb Long Reach Radiator Cap / Pressure Cap / Expansion Tank Cap.
- Stainless Steel
- Shipping is expensive, more than the price for the cap. But it works.
- It does say "made in England" in small letters, if that's an issue for your restoration.
- I did have to file the cap tangs just a tiny bit to get it to install easier.
- Installed, it is rotated 90 degrees from what is shown in Packard service photos, at least on my car anyway.

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