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> Speedo Drive Gear Sealing Modification, ----Now a 914Rubber Product-----
McMark
post Feb 19 2010, 02:05 PM
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I'm now offering this speedo drive gear modification to help seal one of the more persistent leaks on the 914 transmission. By adding a second, lower o-ring to this part it not only gains a second barrier again leaking, but also helps reduce the vibration that can wear the clearances and cause further leaking.

This part sits inside the transmission tail cone and the angle drive screws into it, then the cable attaches to the angle drive.
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The new internal seal is noticeably smaller on the ID. This means more sealing pressure against the gear shaft, and therefore better sealing against oil leaks.
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Now available HERE from 914Rubber.

This member (Thanks Eric!) had a significant leak at the speedometer, even while parked. After this modification was done... ZERO LEAKS! Read his story here.
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SirAndy
post Feb 19 2010, 02:53 PM
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Great idea! (IMG:style_emoticons/default/smilie_pokal.gif)
After years of abuse, the case often is slightly oval allowing for oil to seep by.


A second o-ring should take care of that ...
(IMG:style_emoticons/default/w00t.gif) Andy
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IronHillRestorations
post Feb 19 2010, 05:26 PM
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VERY COOL!!! You get a gold star McMark!!!!
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whatabout1
post Feb 19 2010, 05:54 PM
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PM sent
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ConeDodger
post Feb 19 2010, 07:11 PM
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This looks cool. Mine doesn't leak that I know of but I will keep it in mind...
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Sleepin
post Feb 19 2010, 10:14 PM
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Awesome!
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McMark
post Mar 9 2010, 11:26 PM
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These are now available only as complete rebuilds, all new o-rings, a new internal seal, and a new sealing washer. No compromise, no second guessing, no leaks.
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eyecolor
post Mar 16 2010, 07:16 AM
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Count me in

Tell me how to pay and where to send the core

thanks

George
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McMark
post Mar 16 2010, 11:46 AM
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PayPal: $65 to mark@originalcustoms.com

Core: Original Customs
19660 Eighth St East
Sonoma, CA 95476
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McMark
post Mar 24 2010, 12:32 PM
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Sleepin' posted his experience with the speedo modification. Read about it here.
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jflash914
post May 31 2010, 02:39 PM
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QUOTE(McMark @ Mar 24 2010, 10:32 AM) *

Sleepin' posted his experience with the speedo modification. Read about it here.


McMark,
Besides removing the set screw what else is needed to remove the speedo drive?? Do you have to remove the back plate of the trans to get the drive shaft out?
Thanks,
Jack
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BKLA
post May 31 2010, 06:00 PM
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When I removed my speedo drive for my track day car, I machined a plug with two 0 rings with a centered trans temperature probe. Seemed the prudent thing to do.

No leaks!

I never thought of offering a simple modification like this on the speedo drive. Great Idea!
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McMark
post May 31 2010, 09:22 PM
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Jack, once the set screw is removed the speedo drive just pulls out. They can get quite stuck sometimes though. Leaving the angle adapter in place will help give you a place to grab.

Make sure the transmission is drained, or the rear end is HIGH up or the gear oil will drain out all over.
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jflash914
post Jun 1 2010, 08:20 AM
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QUOTE(McMark @ May 31 2010, 07:22 PM) *

Jack, once the set screw is removed the speedo drive just pulls out. They can get quite stuck sometimes though. Leaving the angle adapter in place will help give you a place to grab.

Make sure the transmission is drained, or the rear end is HIGH up or the gear oil will drain out all over.


Thanks McMark
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Kevins911
post Jun 25 2010, 12:41 PM
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Hi Mark, just wondering if you are still making these? I sent you a pm.

Cheers
Kevin
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McMark
post Jun 25 2010, 01:17 PM
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Yes I am. I'm waiting on more seals from Porsche, but as soon as they come in more will be ready to ship.
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Ericv1
post Jul 1 2010, 07:21 AM
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QUOTE(McMark @ Jun 25 2010, 03:17 PM) *

Yes I am. I'm waiting on more seals from Porsche, but as soon as they come in more will be ready to ship.



What's the turn around time? I just degreased my transmission (in the middle of a six conversion) and found it is leaking at the angle drive. Do I need to send the drive gear as well as the housing? Thanks.
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McMark
post Nov 10 2010, 03:33 PM
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Turn around time is one day. The only piece I need sent is the piece pictured at the top of this thread. Not the angle drive, not the geared shaft.
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SUNAB914
post Dec 24 2010, 06:51 AM
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Hey I will order one as soon as I get settled in on my move. Be contacting you in Jan.
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McMark
post Mar 29 2011, 04:04 PM
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Gear seal kits are now available with the speedo drive for a completely leak free transmission. Seal kits are only $17.50. (IMG:style_emoticons/default/sunglasses.gif)
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