 Testing Original Custom's Upgraded Speedo Drive Seals, Initial impressions and installation. |
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| Sleepin |
 Mar 18 2010, 09:14 PM
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#1
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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  |
My wife's '73 was leaking a huge amount of oil out of the speedo drive. I contacted McMark to try out his newly designed speedo drive.
As you can see, this drive was leaking quite a bit. Just sitting in the garage it would drain out a major spot just in a couple days. (IMG:http://www.914world.com/bbs2/uploads_offsite/i171.photobucket.com-179-1269017475.1.jpg) Here is my core sitting next to the new unit. Notice the extra O-ring: (IMG:http://www.914world.com/bbs2/uploads_offsite/i171.photobucket.com-179-1269017476.2.jpg) The swap was straight forward. The only difference I noticed from a regular speedo drive was a little persuasion required to very lightly tap the drive into position. I just used a small rubber mallet to accomplish this. I am confident that I did not pinch the O-rings, and it felt like a good solid seal. Once in place without the set screw in, I could not wiggle or move the drive from side to side at all. A quick fill of the trans: (IMG:http://www.914world.com/bbs2/uploads_offsite/i171.photobucket.com-179-1269017477.3.jpg) A quick wipedown to get rid of any oil: (IMG:http://www.914world.com/bbs2/uploads_offsite/i171.photobucket.com-179-1269017477.4.jpg) Also put a strip of cardboard underneath the trans...I want to make sure this isn't going to leak. (IMG:http://www.914world.com/bbs2/uploads_offsite/i171.photobucket.com-179-1269017478.5.jpg) I will snap another picture underneath in a couple days. I highly doubt that this will leak at all! Such a good idea IMO...I wonder why no one thought of this before! |
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| ConeDodger |
Mar 19 2010, 09:39 AM
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#2
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Apex killer! Group: Members Posts: 23,824 Joined: 31-December 04 From: Tahoe Area Member No.: 3,380 Region Association: Northern California 
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Mark has a BIG BRAIN (IMG:style_emoticons/default/biggrin.gif) Looks good so far!
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| johannes |
Mar 19 2010, 10:34 AM
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#3
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Club Porsche 914 France President Group: Members Posts: 3,084 Joined: 13-January 06 From: France Member No.: 5,409 Region Association: France |
That's just what I am looking for ...
Where ? How much ? |
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| ClayPerrine |
Mar 19 2010, 10:52 AM
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#4
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Life's been good to me so far..... Group: Admin Posts: 15,901 Joined: 11-September 03 From: Hurst, TX. Member No.: 1,143 Region Association: NineFourteenerVille
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The problem with the 914 speedo drive is that they used aluminum in a magnesium case. Different expansion rates means leaks. On the 911, Porsche used a brass speedo drive. Same expansion rate as magnesium. Change the drive for the brass one, and it doesn't leak.
But those suckers are hard to find. This should be a good alternative solution. |
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| Sleepin |
Mar 19 2010, 11:06 AM
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#5
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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 |
QUOTE(johannes @ Mar 19 2010, 10:34 AM)  That's just what I am looking for ... Where ? How much ? http://www.914world.com/bbs2/index.php?showtopic=103985 QUOTE PayPal: $65 to mark@originalcustoms.com Core: Original Customs 19660 Eighth St East Sonoma, CA 95476 |
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| johannes |
Mar 19 2010, 12:40 PM
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#6
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Club Porsche 914 France President Group: Members Posts: 3,084 Joined: 13-January 06 From: France Member No.: 5,409 Region Association: France |
Thanx ! ...
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| Sleepin |
Mar 20 2010, 08:20 PM
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#7
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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 |
It has been two days and no leaks! I drove it and got it nice and warm...not a drip! (IMG:style_emoticons/default/biggrin.gif)
(IMG:http://www.914world.com/bbs2/uploads_offsite/i171.photobucket.com-419-1269381044.1.jpg) |
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| Sleepin |
Mar 21 2010, 05:15 PM
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#8
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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 |
Val put 160 miles on her car today...still not a drip! Looks as if this was my last leak to fix! Nice and dry under there now! (IMG:style_emoticons/default/biggrin.gif)
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| McMark |
Mar 21 2010, 05:27 PM
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#9
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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 |
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| Sleepin |
Mar 24 2010, 04:57 PM
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#10
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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 |
I crawled up under the car again today. It really seems like this mod worked very well. It is so nice not to have to wipe gear oil off of my garage floor anymore...(at least on her side of the garage). (IMG:style_emoticons/default/biggrin.gif)
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| 1968Cayman |
Mar 24 2010, 08:43 PM
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#11
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Redacted by Irving Washington Group: Members Posts: 116 Joined: 5-February 10 From: Holly Springs, GA Member No.: 11,332 Region Association: South East States |
QUOTE(ClayPerrine @ Mar 19 2010, 12:52 PM) The problem with the 914 speedo drive is that they used aluminum in a magnesium case. Different expansion rates means leaks. On the 911, Porsche used a brass speedo drive. Same expansion rate as magnesium. Change the drive for the brass one, and it doesn't leak. But those suckers are hard to find. This should be a good alternative solution. Sorry to jack the thread, but do you know if a drive from a 911 Sporto would work in a 901? |
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| McMark |
Mar 24 2010, 09:28 PM
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#12
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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 |
It should.
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| ClayPerrine |
Mar 25 2010, 06:05 AM
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#13
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Life's been good to me so far..... Group: Admin Posts: 15,901 Joined: 11-September 03 From: Hurst, TX. Member No.: 1,143 Region Association: NineFourteenerVille
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QUOTE(McMark @ Mar 24 2010, 10:28 PM) It should. (IMG:style_emoticons/default/agree.gif) I don't think there is any difference at all...... But the 911 angle drive won't work. It turns backwards for a 914....... BTDT. |
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| jflash914 |
May 31 2010, 03:06 PM
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#14
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Member Group: Members Posts: 80 Joined: 24-February 05 From: binghamton,ny Member No.: 3,652 |
Hello Sleepin,
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 speedo drive out?? Thanks, Jack |
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| McMark |
May 31 2010, 06:37 PM
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#15
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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 |
Nope, there is the single screw, then it just pulls out. Drain the transmission or raise the ass end a lot or you'll get a nice stinky gear oil shower. (IMG:style_emoticons/default/cool.gif)
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| john_g |
Feb 5 2013, 06:59 PM
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#16
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Member Group: Members Posts: 110 Joined: 1-November 12 From: british columbia Member No.: 15,100 Region Association: Canada |
QUOTE(McMark @ May 31 2010, 04:37 PM) Nope, there is the single screw, then it just pulls out. Drain the transmission or raise the ass end a lot or you'll get a nice stinky gear oil shower. B) Mark, I just got onto this thread (did a search as soon as I diagnosed the source of the leak). I want to remove the speedo drive, but ... where the heck is the set screw?? (I have a side shifter, if that makes any difference). |
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| SirAndy |
Feb 5 2013, 07:13 PM
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#17
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Resident German Group: Admin Posts: 41,891 Joined: 21-January 03 From: Oakland, Kalifornia Member No.: 179 Region Association: Northern California |
QUOTE(john_g @ Feb 5 2013, 04:59 PM) where the heck is the set screw?? 10 o'clock in the picture below ... (IMG:http://www.914world.com/bbs2/uploads_offsite/i171.photobucket.com-179-1269017477.4.jpg) |
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