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Rebuild transaxle or buy a used one?

 
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ZV  



Joined: 27 Nov 2002
Posts: 297

PostPosted: Thu Jan 01, 2004 6:35 am    Post subject: Rebuild transaxle or buy a used one? Reply with quote

Took my car in for a new clutch master and slave cylinder (yeah, I know, should have done them myself but the mechanic has a nice heated shop and I don't and it's bloody cold here), figured while it was in I would have them change the oil and the transaxle fluid.

Everything went fine until they drained the transaxle when they found metal particles in the fluid. Lots of them. The clutch was replaced just under 3,000 miles ago and the transaxle fluid was clean then so I can only assume that a bearing let go. Should I consider re-building the transaxle or should I try to find a good used transaxle?

I'm tempted to just find a used transaxle to make the swap easier, but at the same time a used transaxle will probably have a weak 2nd gear synchro (the reason I wanted new fluid to begin with) and trying to find a used one may take longer than rebuilding. I like the idea of rebuilding this transaxle simply because I would effective have a new transaxle when finished, but if it's going to be an absurd amount of money then I may be better off with a used transaxle.

The current transaxle has non-standard gear ratios, 60 mph in 5th is 3,000 RPM and 80 mph is 4,000 RPM, the car has a bit more "snap" to it, and the cost in fuel mileage isn't terrible (25 mpg no matter how I drive it). Another point in favor of re-building.

At this point I'm taking suggestions. Anyone been in this position? Anyone have a spare transaxle for sale? Thanks to everyone.

Aaron
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1976 Porsche 914 2.0 - Driving Restoration.
1987 Porsche 924S - Daily Driver
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Joes924Racer  



Joined: 03 Nov 2002
Posts: 11964
Location: Oregon, Denver Colorado native!

PostPosted: Thu Jan 01, 2004 9:19 am    Post subject: Reply with quote

Shifting as a art.. ha ha I agree. I would do both if possible
Do you know where the bearing is that failed I dont. Seems though that
rebuilding a trans and adding new synchros is a very worthwhile project.
If you get another trans you can put it in and then rebuild the broken one.
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ZV  



Joined: 27 Nov 2002
Posts: 297

PostPosted: Fri Jan 02, 2004 3:31 am    Post subject: Reply with quote

Joes924Racer wrote:
Shifting as a art.. ha ha I agree. I would do both if possible
Do you know where the bearing is that failed I dont. Seems though that
rebuilding a trans and adding new synchros is a very worthwhile project.
If you get another trans you can put it in and then rebuild the broken one.

This was my thought too. Especially if I can find a decent used transaxle with an LSD.

I don't know where the failure is exactly, I'm taking it in to a shop that has lots of experience with Porsches and their transaxles and they're going to try to pinpoint the problem.

Aaron
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Lizard  



Joined: 03 Nov 2002
Posts: 9364
Location: Abbotsford BC. Canada

PostPosted: Fri Jan 02, 2004 4:29 am    Post subject: Reply with quote

ZV are you sure that it isn't just the fact that you might have ground gears a few times or are alittle too hard on the syncros causing them too wear really fast, as this would cause alot of particals in the oil as well, is it hard to change gears when its cold
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ZV  



Joined: 27 Nov 2002
Posts: 297

PostPosted: Fri Jan 02, 2004 8:13 am    Post subject: Reply with quote

Lizard wrote:
ZV are you sure that it isn't just the fact that you might have ground gears a few times or are alittle too hard on the syncros causing them too wear really fast, as this would cause alot of particals in the oil as well, is it hard to change gears when its cold

I'd have to be a damn fool to own a 914 and think that any Porsche transaxle can be rushed or forced through the gears.

No grinding gears, I just double-clutch until the transaxle warms up when it's cold. If I can manage it in the 914 without grinding things, I think I can manage it in the 924S.

The fluid that was in it before the clutch replacement had been in it all last winter and if anything I was driving the car harder then than I was in this last interim. My main use of the car has been to drive it to college (Pittsburgh) from home (Toledo). 90% of the time it's in 5th gear just cruising and no, I don't do jackrabbit starts from the tollbooths on the turnpike. I'd have to be grinding gears on every shift to put that many particles into fresh fluid in under 3,000 miles. The fluid was replaced when I put the clutch in and the old fluid was not bad. The fluid that just came out was cloudy, grey, and there were a lot of metal particles in it. No-one changes driving style enough to make that kind of difference.

Aaron
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Lizard  



Joined: 03 Nov 2002
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PostPosted: Fri Jan 02, 2004 8:33 am    Post subject: Reply with quote

I was simply stating a possibility not stating that you drive hard
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ZV  



Joined: 27 Nov 2002
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PostPosted: Sat Jan 03, 2004 8:52 am    Post subject: Reply with quote

Well, had a transaxle shop look at the car. They pronounced it a failing bearing in the R&P.

The transaxle shop actually said not to worry about it and to just drive it, said they had heard 924/944/924S transaxles that sounded much, much worse than mine and that those transaxles kept going for 50,000-60,000 miles before the owners of those cars just got tired of the noise and replaced them without a failure. I actually wish they had pronounced it dead because that would have made the decision easy.

Now I'm left hanging again, I hate to keep driving the thing with this hanging over my head. At the same time, I have a perfectly good Lincoln Mark VIII coupe that was free and is so much more practical that I hate to keep pumping money into the 924S. After all, the 924S was never supposed to be a project, that's why I have the 914. I'm half tempted to sell the 924S and the Lincoln and buy a newer 944 or 944S but I'm thinking I'll need something bigger than the 924/944 and the 914 soon. Blech, this was not a decision I wanted to be making so soon.

Aaron
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John Brown  



Joined: 07 Nov 2002
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PostPosted: Sat Jan 03, 2004 11:43 am    Post subject: Reply with quote

You don't say, and the shop maybe did not say (exactly which gear). The pinion bearing is notorious. Which then lets the ring&pinion move around which starts wearing the gears .... And, yes, they will go a long time (sometimes) but then all that metal just eats up everything else in there. Hard decision to make. Been there, done that, got the T-shirt. Good luck whatever you decide.
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ZV  



Joined: 27 Nov 2002
Posts: 297

PostPosted: Sat Jan 03, 2004 4:10 pm    Post subject: Reply with quote

John Brown wrote:
You don't say, and the shop maybe did not say (exactly which gear). The pinion bearing is notorious. Which then lets the ring&pinion move around which starts wearing the gears .... And, yes, they will go a long time (sometimes) but then all that metal just eats up everything else in there. Hard decision to make. Been there, done that, got the T-shirt. Good luck whatever you decide.

Noticeable in 2, barely. Definitely noticeable in 3 during acceleration/deceleration. More noticeable in 4 under the same circumstances. Pretty dang noisey in 5th all the time.

Small "crick" sound when beginning to back up after rolling forwards or when beginning to go forward after rolling backwards. Not when engaging the gear, when engaging the clutch.

Aaron
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wdb  



Joined: 02 Nov 2002
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PostPosted: Sat Jan 03, 2004 5:38 pm    Post subject: Reply with quote

see the used parts section for used pinion bearings $15 . I dont know for a fact that vw vanagon trans parts will work in the 924 , but it might be worth buying them for $20 to see, depending on how much porsche wants for new ones .

http://www.longenterprises.com/specials.htm

is it possible to just remove the dif carrier case cover with the trans in the car and replace the bearings , or will you need to completely remove and tear down the trans
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wdb  



Joined: 02 Nov 2002
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PostPosted: Sat Jan 03, 2004 6:32 pm    Post subject: Reply with quote

see # 7 in pic for pinion bearing .

http://www.ckoon.org/vw/tranny/9.html

vw trans rebuid guide from the begining .

http://www.ckoon.org/vw/tranny/1.html

index

http://www.type2.com/library/drivetra.htm#7
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ZV  



Joined: 27 Nov 2002
Posts: 297

PostPosted: Sun Jan 04, 2004 7:10 am    Post subject: Reply with quote

wdb wrote:
is it possible to just remove the dif carrier case cover with the trans in the car and replace the bearings , or will you need to completely remove and tear down the trans

Complete removal and tear-down. The differential portion also requires more than a couple specialized tools.

Aaron
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wdb  



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PostPosted: Sun Jan 04, 2004 7:41 am    Post subject: Reply with quote

ZV wrote:
The differential portion also requires more than a couple specialized tools.
other than these ,what else is needed ?

pinion removal .
http://www.ckoon.org/vw/tranny/32.html

ring gear adjustment device
http://www.ckoon.org/vw/tranny/33.html

back lash masurement arm .
http://www.ckoon.org/vw/tranny/35.html

pinion shaft measurement device.
http://www.ckoon.org/vw/tranny/36.html
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ZV  



Joined: 27 Nov 2002
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PostPosted: Mon Jan 05, 2004 12:23 pm    Post subject: Reply with quote

wdb wrote:
ZV wrote:
The differential portion also requires more than a couple specialized tools.
other than these ,what else is needed ?

I don't know, I was going on what other people who have rebuilt their transaxles have said and on what the shop said. The main gears are significantly less expensive to fix than anything in the differential. More set-up and labor cost I was told.

ZV
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wdb  



Joined: 02 Nov 2002
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PostPosted: Mon Jan 05, 2004 4:12 pm    Post subject: Reply with quote

well if you plan to keep the car for many years, fix it right and be done with it for 20 years , do likewise to the engine,clutch and torque tube .
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