Author Topic: ‘61 Hydramatic speedo drive seal  (Read 266 times)

Offline David Greenburg

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‘61 Hydramatic speedo drive seal
« on: November 02, 2017, 02:37:32 PM »
My ‘61 has a pretty good leak from the speedo drive.  Does anyone know a source for a new seal? A trusted trans. guy has not been able to locate one.
« Last Edit: November 02, 2017, 02:50:11 PM by David Greenburg »
David Greenburg
'60 Eldorado Seville
'61 Fleetwood Sixty Special

Offline The Tassie Devil(le)

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Re: ‘61 Hydramatic speedo drive seal
« Reply #1 on: November 02, 2017, 04:39:19 PM »
Is't it a simple "O" Ring?

Bruce. >:D
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Offline David Greenburg

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Re: ‘61 Hydramatic speedo drive seal
« Reply #2 on: November 02, 2017, 04:45:18 PM »
Apparently not.
David Greenburg
'60 Eldorado Seville
'61 Fleetwood Sixty Special

Offline bcroe

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‘61 Hydramatic speedo drive seal
« Reply #3 on: November 03, 2017, 02:06:14 PM »
On many trans, the speedo gear & shaft are plastic, and the area of
seal contact wears down so the seal is no longer effective.  Bruce Roe

Offline Eric DeVirgilis CLC# 8621

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Offline Thor

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Re: ‘61 Hydramatic speedo drive seal
« Reply #5 on: November 03, 2017, 06:09:23 PM »
Found this...

https://www.summitracing.com/parts/opg-km01199/applications/make/cadillac

I bought that part to seal the cable-through-firewall hole....... not even close.  The cable passes through the firewall at quite an angle.  The correct seal was found from our friends in Scandanavia!

As for the Speedo cable seal leak - I have that problem too, will be interested to see what surfaces.

Randy Bergum
1960 Eureka Hearse
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Offline P. Manoogian

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Re: ‘61 Hydramatic speedo drive seal
« Reply #6 on: November 03, 2017, 06:58:45 PM »
Get a 5/16" 0 ring at NAPA. I did and it solved the leak.
1961 Eldorado - Shell Pearl/Mauve
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Offline David Greenburg

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Re: ‘61 Hydramatic speedo drive seal
« Reply #7 on: November 03, 2017, 07:32:27 PM »
The Summit part looks like a firewall grimmest, and not the trans seal.  I’ll try an O ring and see if that helps, although if it were that easy I think the trans guy would have nailed it. He’s pretty familiar with old GM slushboxes.
David Greenburg
'60 Eldorado Seville
'61 Fleetwood Sixty Special

Offline russ austin

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Re: ‘61 Hydramatic speedo drive seal
« Reply #8 on: November 04, 2017, 09:54:06 AM »
It is an O ring. The housing is metal and the speedo shaft is metal. The seal wears out and is a simple replacement.
R.Austin

Offline Petrolbowser

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Re: ‘61 Hydramatic speedo drive seal
« Reply #9 on: November 06, 2017, 01:48:46 AM »
It's just an o ring. I did one last year cost a few cents and took about half an hour.

Offline David Greenburg

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Re: ‘61 Hydramatic speedo drive seal
« Reply #10 on: November 06, 2017, 12:18:58 PM »
Good to know. Always nice to have a repair simpler than anticipated.
David Greenburg
'60 Eldorado Seville
'61 Fleetwood Sixty Special

Offline Roger Zimmermann

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Re: ‘61 Hydramatic speedo drive seal
« Reply #11 on: November 11, 2017, 07:49:01 AM »
My 2 cars (1956 & 1957) are leaking at the spedometer cable; not a lot but it's annoying. I don't see where an o ring can be installed.
Most probably the housing for the later cars are different and allow for an o ring installation.
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Offline russ austin

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Re: ‘61 Hydramatic speedo drive seal
« Reply #12 on: November 11, 2017, 08:40:14 AM »
46-64 hydro matics gear sleeves are the same. The O ring is internal, and hard to see due to being worn down.
R.Austin

Offline Roger Zimmermann

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Re: ‘61 Hydramatic speedo drive seal
« Reply #13 on: November 11, 2017, 09:16:22 AM »
Therefore, I did not look good enough. I will have to look again on a spare part. Do you have the diameter of that o ring?
1956 Sedan de Ville (sold)
1956 Eldorado Biarritz
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1972 Coupe de Ville (not yet arrived)
2011 DTS
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Offline P. Manoogian

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Re: ‘61 Hydramatic speedo drive seal
« Reply #14 on: November 11, 2017, 12:19:40 PM »
I believe it is 5/16". The 3/8" one balls up inside...it will work for a bit...but then it will leak.
1961 Eldorado - Shell Pearl/Mauve
1959 Coupe DeVille - Vegas Turquoise
2012 CTS Coupe- Crystal Red
1970 AMX