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| McMark |
 Feb 19 2010, 10:07 PM
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#1
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914 Freak!  Group: Retired Admin Posts: 20,179 Joined: 13-March 03 From: Grand Rapids, MI Member No.: 419 Region Association: None  |
I had a brain wave today while resealing a transmission. I've pulled out so many speedometer drives that are slathered in RTV trying to stop a leak. But that o-ring at the top of the drive almost never does a good job of sealing, even when new. Part of the reason is that the speedometer cable hangs off the end of that thing and vibrates back and forth, eventually wearing that bore into an slight oval.
It occurred to me that adding a second o-ring further down the drive body would help by adding another level of protection as well as helping to keep the drive centered in the bore, thereby helping the upper o-ring to do its job more successfully. So that's what I did, and if anyone else is interested in having this modification done, check here. (IMG:style_emoticons/default/aktion035.gif) (IMG:style_emoticons/default/aktion035.gif) Attached image(s) 
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| sixnotfour |
Feb 19 2010, 10:38 PM
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#2
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914 Wizard Group: Members Posts: 10,695 Joined: 12-September 04 From: Life Elevated..planet UT. Member No.: 2,744 Region Association: Rocky Mountains 
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great idea , could you have done it ahead of the bolt ? your method may still weep at the bolt.
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| Sleepin |
Feb 19 2010, 10:40 PM
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#3
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Advanced Member Group: Members Posts: 3,647 Joined: 20-November 07 From: Grand Junction, Co. Member No.: 8,357 Region Association: Rocky Mountains |
Very cool! Or either side of the bolt. I think this will definetly be sufficient though. If you need a test subject for a 3 O-ring setup I will volunteer! (IMG:style_emoticons/default/wink.gif)
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| Katmanken |
Feb 20 2010, 10:08 AM
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#4
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You haven't seen me if anybody asks... Group: Members Posts: 4,738 Joined: 14-June 03 From: USA Member No.: 819 Region Association: Upper MidWest |
Cool!
I'm still trying to remove one of those from my spare transmission. I can get it to move about .040 with a lot of pressure and that's about it. |
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| McMark |
Feb 20 2010, 07:03 PM
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#5
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914 Freak! Group: Retired Admin Posts: 20,179 Joined: 13-March 03 From: Grand Rapids, MI Member No.: 419 Region Association: None |
Got a slide hammer? I have a 911 speedo cable 'stub' that I could make into something compatible with the slide hammer. That'll get it out.
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| EdwardBlume |
Feb 20 2010, 08:01 PM
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#6
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914 Wizard Group: Members Posts: 12,338 Joined: 2-January 03 From: SLO Member No.: 81 Region Association: Central California
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Great idea.... now drive the transmission 50,000 miles and tell us how it does... (IMG:style_emoticons/default/w00t.gif)
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| detoxcowboy |
Feb 21 2010, 10:24 AM
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#7
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Senior Member Group: Members Posts: 1,294 Joined: 30-January 08 Member No.: 8,642 Region Association: Africa |
I like it, repost when you get the other seals..
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| McMark |
Mar 9 2010, 11:28 PM
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#8
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914 Freak! Group: Retired Admin Posts: 20,179 Joined: 13-March 03 From: Grand Rapids, MI Member No.: 419 Region Association: None |
I've confirmed that the seals I ordered are the correct ones. This modification is now only sold as a complete refresh of the speedo drive. Two new o-rings, a new internal seal, and a new sealing washer. All new, through and through, and better than original.
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| SirAndy |
Mar 10 2010, 11:42 AM
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#9
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Resident German Group: Admin Posts: 41,954 Joined: 21-January 03 From: Oakland, Kalifornia Member No.: 179 Region Association: Northern California |
QUOTE(McMark @ Mar 9 2010, 09:28 PM)  I've confirmed that the seals I ordered are the correct ones. This modification is now only sold as a complete refresh of the speedo drive. Two new o-rings, a new internal seal, and a new sealing washer. All new, through and through, and better than original. (IMG:style_emoticons/default/thumb3d.gif) |
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| zx-niner |
Mar 10 2010, 06:28 PM
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#10
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Member Group: Members Posts: 294 Joined: 13-June 05 From: Las Vegas, NV Member No.: 4,269 Region Association: Central California |
Ordered mine and sent off a core today.
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| Dr Evil |
Mar 10 2010, 08:47 PM
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#11
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Send me your transmission! Group: Members Posts: 23,035 Joined: 21-November 03 From: Loveland, OH 45140 Member No.: 1,372 Region Association: MidAtlantic Region
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Interesting. I just clean up the bore and use Vaseline on the seal. I am interested to hear how this performs, but your logic seems solid (IMG:style_emoticons/default/smile.gif)
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| pbanders |
Mar 11 2010, 12:24 PM
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#12
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Senior Member Group: Members Posts: 939 Joined: 11-June 03 From: Phoenix, AZ Member No.: 805 |
Mine was leaking a few drops a day. I folded up a shop rag and zip tied it around the drive. That was a 2 years ago, haven't seen a drop on the floor since, and I like how cheezy it looks.
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