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Help me solve my ATF leak on the Bavarian Valdez

 
Old 05-11-2011, 06:53 PM
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vinbar
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Default Help me solve my ATF leak on the Bavarian Valdez

Ok -its only been a few weeks with my 84 928 auto and I wonder if BP designed the tranny seals on this thing...

I've gotten a lot of ATF fluid (puddles - not drips) from the pass side of the pan and so I removed the metal sheild - cleaned it up REALLY well and then left it sit for 24 hrs. These pictures are what I came back to (no driving - just sitting).

I've got a new gasket/filter and am going to do a tranny service - but do I need to replace that plastic tank or some lines while I'm down there? Advice? Could it be due to the previous owner over filling the trans? I haven't had a chance to check at temperature levels while running.







https://lh4.googleusercontent.com/_l...0/IMG_0132.jpg
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Old 05-11-2011, 07:03 PM
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Leon Speed
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All the answers you will need are here https://rennlist.com/forums/928-foru...-page-3-a.html

I've been leak-free for a few weeks (no Depends jokes please ).
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Old 05-11-2011, 07:10 PM
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Roy928tt
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Porsche are built in Stuttgart which is in Swabia I believe, and it is leaking because you have insulted it by calling it Bavarian. Apologise profusely to the vehicle and all MAY be forgiven, or it may be a typical iron willed German and continue to leak anyway.


Cheers Roy
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Old 05-11-2011, 08:27 PM
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a few cautions before you drop the pan.

You didnt mention if you changed the fluid or not but if not then you need 10 QTS of Dextron 3 or 4.
I suggest Valvoline Max life in a red bottle.

Order a new filter and gasket
as well as the bowden cable housing O ring,
and a tank seal O ring.
And a cap seal

First it will be easier to work on if the right heat shield is moved,
remove the bolts and slide it as far away as you can
Then with a pair of bent needle nose pliers pull the tank vent hose off the transmission, this is a stronger fitting than the tank and it is possible to snap off the tank vent since its plastic.

Remove the torque converter plug, ( holds about 4 qts)
a helper is a good thing to turn the crank CW while looking at it.
while you look in the grate at the bottom of the trans bellhousing

Then drain the pan and then drop it. Note the tightness of the pan bolts they should be low torqued 6 ft/lbs

With the pan off you can then disconnect the bowden cable from the throttle assembly quadrant .
Then at the trans push the little tab in on the housing and twist it CCW then lift it out you can see a small arm moving with the pan off,
disconnect the cable from the arm, and remove the old O ring use some silicone grease on the O ring or Dow Corning 111 this will keep the o ring soft and let it slide easily back into place.

After fitting the cable housing to the trans make sure it has caught the tab, then go connect the cable at the throttle quadrant


Swap out the filter then go clean the pan,, Make sure the pan isnt bent and the tab fingers are not spread out from overtightening.

Remove the cap nut on the tank and clean the O ring sealing area, as well as the tank, put some silicone grease on the new o ring and install the tank and heat shield to the pan.
fit the gasket to the pan ( dry) and with the bolts also cleaned off refit the pan, dont overtighen the pan bolts.
Fill the tank with about 3 qts of ATF then start the engine let it run for about 30 seconds then shut it off , go add more ATF then run and stop for 30 seconds, do this a few times till the tank level stays close to the fill mark, once there you can start the engine and with it running and the E brake set and your foot on the brake, put the trans through all of the shifter selections, then into neutral let the wheels stop if they are turning .

Warning going from a drive selection to park could damage the parking pawl if the wheels are turning always go to neutral then park
once the trans is filled go drive the car
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Old 05-12-2011, 02:31 AM
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Originally Posted by Roy928tt View Post
Porsche are built in Stuttgart which is in Swabia..., and it is leaking because you have insulted it by calling it Bavarian. Apologise profusely to the vehicle and all MAY be forgiven, or it may be a typical iron willed German and continue to leak anyway.
+928
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Old 05-17-2011, 01:54 PM
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Replaced the pan gasket (did a 'service' with filter) - cleaned up the tank o-ring seal area and cap seal - put everything back together - took it for a drive - and now...NO LEAKS!!

I probably should have replaced the bowden o-ring, but I didn't want to wait for parts and it was a fairly easy job (with a lift) - so if I get more leaks I can do it again.

Thanks for the help guys!
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Old 05-17-2011, 03:45 PM
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did you drain out the torque converter as well?
how many QTS did you put in the trans
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Old 05-17-2011, 03:54 PM
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I was going to suggest checking out the modulator valve as a possible leak source. I had a hard to track down leak on mine and it turned out that the O ring seal around the modulator had become brittle and no longer sealing. Glad you got it tracked down.
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Old 05-17-2011, 06:52 PM
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Mine still leaking...damn it! Seems positional... Sometimes it leaks after a drive, sometimes it does not! What the hell could that be? Never seem to leak DURING the drive or we would see where it has been slung all around or streaming towards the back of the car and that is not the case. Drips are straight down...
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Old 05-17-2011, 07:01 PM
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I didn't do a full torque convertor drain - since the previous owner had done a recent trans service and the fluid looked/smelled/tasted new (probably could have left the filter - but I had it apart and a new filter in hand - so I swapped it out anyway). I think I put about 6-7 qts back into it - but the previous owner had overfilled the trans (it would read near the max level on the lift with the engine cold/off). I haven't been able to drive it around enough to get it warm and do a proper ATF level check - need to adjust or replace the wheel front bearings before driving it around anymore. I just picked up the car last month and have been attacking the small projects to get it back to daily driver condition.
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Old 05-17-2011, 07:03 PM
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Originally Posted by pcar928fan View Post
Mine still leaking...damn it! Seems positional... Sometimes it leaks after a drive, sometimes it does not! What the hell could that be? Never seem to leak DURING the drive or we would see where it has been slung all around or streaming towards the back of the car and that is not the case. Drips are straight down...
The girl on your wing is causing undue stress on your rear end...
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Old 05-17-2011, 07:08 PM
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No, other side from my rear end I assure you...Well, in my dreams she would actually be causing me undo stress...LOL!
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Old 05-23-2011, 06:47 PM
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Just take time to look before assuming the worst. My transmission dumped what seemed like quarts of fluid after barely leaking for a while - I dropped the tranny, went through and replaced all the seals before I realized that the shop that the previous owner paid over $2k for transmission work overtorqued the pan. New $55 pan and I would have been in business in about an hour instead of taking almost a year of all the "While you're in theres"
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