Landseer

I can show you a G28-08 box. Should have similarities to the GT, but not sure how PSD factors-in. Not sure from where yours is leaking.

Rob Edwards

What I'm calling rear control arms are shown here, with the aluminum mounting bracket to the left of the picture:





The air cleaner box holds the air filter in the engine compartment. If you drop the transmission in the back, the whole engine will tilt back and squish the the box against the firewall. You might also need to release the shifter boot from the console.


E-brake brackets = the brackets that hold the metal emergency brake tubes to the rear crossmember. There might be enough slack in the cable to leave it alone, but it'll be in the way of getting to the inner crossmember-to-body bolts...


Tranny pics:

Interestingly enough, this is the first picture I ever took of my GT, the day I first looked at it. Most of that oil is blowback from a leaking engine oil pan gasket.




But the top of the tranny was filthy too, so either the breather was spewing oil or the top cover bolts were loose (don't recall if they were...). When I pulled the GT tranny:





Cleaned:

Thoomas

Thanks for the pictures. Great stuff!

It looks the same. Did you have any leak from the front seal?

Heres some pictures from mine. Even the lower A-arm on the driver side is wet from oil. More oil on that side of the car for some reason.

Landseer

Dang that's a LOT of oil.

Thoomas

Thanks Rob! Now I get it!

How did your old gasket look?

Thoomas

Yes its a lot. You can understand the complaints from the ones that were behind me!

You´ve really worked hard! Your helper looks totally worn out!

Landseer

I deleted the picture to not interfere with Rob's flow. (the dog in the pic needs to stay close to the action. At 150 lbs, she decides where exactly that will be.)

Thoomas

Gonna buy some gasketmaterial for the topgasket. Anyone know what thickness to use?

Just realized that I have solid motormounts. Will that stop the tranny from coming down if I do Robs procedure?

Thoomas

Followed Robs instructions and the lid is off! Lowered the axle 6cm and there were no problem getting to the bolts.

Have some pics on the lid and gasket. Have no experience of what a gasket should look like when its leaking or not. Do you think that this gasket could leak taht amount of oil that tou see in the previous pics?

Then I´m a bit confused about the arm next to the vent. Cant find it in WSM or PET. Anybody know what it is? Will I have a problem getting the lid back and getting this arm in the right place without seeing anything?

And the two extra holes in the front of the lid? Anyone?

Rob Edwards

Forgetting for the moment that I have no idea what it actually does :

Here's the PET diagram showing that lever:



The arm next to the vent is held by a spring-loaded piston that is bolted to the left side of the case. On reassembly you need to back off the 2 M6 bolts holding the coverplate so that the piston can engage the lever.

You can see the (unbolted) coverplate right next to the ratchet strap in the pic of my cleaned tranny.
Here's a shot of my 90GT tranny open, showing the spring and piston. (Also note there's a spring in one of the recesses in the case to the right of the picture- is yours present?):



As far as the 2 holes in the front of the lid, not sure what's going on there. There's at least 1 dowel/locating pin at each end of the case to locate the lid- maybe you're missing a dowel pin?

And the underside of my GT's lid, showing the 18 year old gasket. All I did to mine was replace the top gasket 2.5 years ago, and it's still clean. (Tragically none of those miles were logged on the Nordschleife.... )




One other thought for you. In Landseer's first picture in post #16, you can see the differential breather on the back of the diff case. I wonder if that got plugged whether it would force more oil out the tranny lid breather (?)

EDIT: Scratch that last thought, I'm confused by a dim memory from the WSM. Only the GTS has an actual diff breather, which replaces the breather in the transmission top cover.

Landseer

I cut a new gasket out of some very tough but thin gasket material that was suitable for oil contact, plus, could suspend across the gears without breaking.

It needs to suspend across the gearbox and prevent oil from splashing out. Also seems to capture grit that finds its way into the vent hole.

Really seemed like the original gasket would have been fine if the bolts hadn't loosened.
(We've worked on actually 3 different 5 speeds in my garage this month, and 2 had very loose bolts).

Thoomas

Thanks for all the input guys!

On the Pet diagram theres one more gasket(23) that could cause the leak! Beginning to feel that I have to get the tranny out to get to all points that can leak. Finding it hard to belive that the cascades of oil can come from either the topgasket or the breather. The bolts were not loose. Dont know wether to renew the top gasket and try it out or take it all apart now that I´m half way there?

Will get out in garage now and look if I have the dowel pin and the spring like on your picture, Rob. But in your picture it looks like theres only a dowel pin at one end!?

Just realized that the roller lever pin also must have some kind of o-ring that could leak!!

Well, well not getting anywhere by crying, back to work.....

Landseer

I don't see how that quantity of oil could escape from a tightly closed, gasketed lid.

Is it leaking at the DS axle shaft and slinging?

Something else is going on.

Thoomas

DS?

Thoomas

DS=drive shaft?

Theres no oil in the torqe tube. Just removed the clamp bolt and its dry in there.

By the way the dowel pin and the spring where in place.