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The "bullet proof" versions of this transmission were in the earlier model cars. There are several aspects of the GTS vehicles, which made them less than the "ultimate" 928. Several.
This failure, no reverse or forward drive, is interesting.
While I can imagine a reverse clutch failure that is severe enough to damage things badly enough so that the forward gears do not function, this is not something that I've seen, to date. (It would be possible for that "nub", which guides the B3 piston, to actually put a hole though into the oil pump, instead of the "nub" simply breaking off of the B3 piston. (This would cause the forward gears to not work.)
Greg,
Thanks for the insights- at least I can take some comfort in that I have my late 90S4 transaxle sat in my garage albeit I have no idea whether it would be viable as a direct swap in unit given it has been sat for some 16 years.
At least my "interpretation" of your original post was reasonable in that sudden loss of drive in reverse is the primary symptom but not loss of the forward gears. My thinking being that somehow oil pressure is being lost but how and where I have no clue.
I suspect the OP does not even have a local dealership he can refer to not that there will be mechanics around who understand the 928 transaxle. My hope was that someone like yourself just might be able to come up with a "try this" and thus solve the issue.
I suspect the OP does not even have a local dealership he can refer to not that there will be mechanics around who understand the 928 transaxle. My hope was that someone like yourself just might be able to come up with a "try this" and thus solve the issue.
You know, we are in our island in South Pacific, but we love cars. In our team We have some very good mechanicals😍 Before to go to the official dealer, I want to understand. We will remove the pan on next week.
I think this was mentioned previously, but if not...
A decade or so ago the shift cable broke a few hundred yards from the house but a mile of driving away. Steep downhill, and I'd selected lowest gear to help with the downhill ride. Went to shift up and that worked, but next downhill and low gear there was no change. I pulled to the side, and put it in park, went there OK but now stuck in park. Scratched head... Crawled under to see why transmission stuck in park, and finally see the broken cable. It would "push" the lever to park position but wouldn't pull. These are exactly the same symptoms that the OP describes.
The shift lever is accessible from the side just in front of the rear tire, but I ended up with way too much of me in front of the tire as I pulled the selector lever out of park and into D. Parking brake set hard, big rocks in front of the other tires. Did I mention this was on a pretty steep hill down from the house?... Anyway, local source 928 International was waiting for restock on the cable, but Greg happened to be parting a car at that moment and sold me the whole shifter lever and cable assembly from it to get me on the road again. New cable arrived and went to spares pile.
Lesson: Check that the shift lever actually moves the gear selector arm on the side of the gearbox.
I think this was mentioned previously, but if not...
A decade or so ago the shift cable broke a few hundred yards from the house but a mile of driving away. Steep downhill, and I'd selected lowest gear to help with the downhill ride. Went to shift up and that worked, but next downhill and low gear there was no change. I pulled to the side, and put it in park, went there OK but now stuck in park. Scratched head... Crawled under to see why transmission stuck in park, and finally see the broken cable. It would "push" the lever to park position but wouldn't pull. These are exactly the same symptoms that the OP describes.
The shift lever is accessible from the side just in front of the rear tire, but I ended up with way too much of me in front of the tire as I pulled the selector lever out of park and into D. Parking brake set hard, big rocks in front of the other tires. Did I mention this was on a pretty steep hill down from the house?... Anyway, local source 928 International was waiting for restock on the cable, but Greg happened to be parting a car at that moment and sold me the whole shifter lever and cable assembly from it to get me on the road again. New cable arrived and went to spares pile.
Lesson: Check that the shift lever actually moves the gear selector arm on the side of the gearbox.
That 6" aluminum guide tube on the cable is essential. When the flared end of that aluminum piece fractures (which is held captive by the strange looking special nut), the aluminum piece moves and the cable can not longer "push", without turning the cable into the curve you describe.
Unfortunately, pretty common, these days.
While I can't say that we install a bunch of shift cables...it's one of those essential parts to keep in inventory, if you work only on these cars. Otherwise you can be sitting around for a week, waiting for a shift cable.
Worth noting: Sometimes, the aluminum part can be shortened slightly and a new flare put on the end.
Sometimes a new cable is the only solution.
I mentally dismissed this as a potential problem, as the OP said he had confirmed the shift arm was moving on the transmission, pretty early in the discussion.
Semi-retired, as of Feb 1, 2023.
The days of free technical advice are over.
Free consultations will no longer be available.
Will still be in the shop, isolated and exclusively working on project cars, developmental work and products, engines and transmissions.
Have fun with your 928's people!
You know, we are in our island in South Pacific, but we love cars. In our team We have some very good mechanicals😍 Before to go to the official dealer, I want to understand. We will remove the pan on next week.
Wow, that sucks!
I guess I could always make a "service call", toss all the pieces required to rebuild one of these transmissions into a box, and fly over to help....
That, alone, would be a nice place to live, right now. Those roads, with that scenery, would be just a bonus.
How do they keep it out?
Seems like even if you guys had quarantine, people coming in would have to eat and interact with someone. And sooner or later it could spread.
Quarantine the airplane on the runway for 14 days, with no contact?
We have only one flight from Tokyo per week (instead of 7 in the old life). All passengers come from Paris. In Paris they have to be covid free. In Noumea, they have to go in quarantine in an hôtel for 14 days. Since march, only 44 people with covid. They are dectected before the end of their quarantine. If they are positive, they go to the hospital and they have to wait to be négative.
Bad news ... We have worked all this day. Nothing new 🥵
1 - Purge.
2 - Remove of pan. A spring was broken. We have repaired it.
3 - Check of working pressure (checkpoint C in WSM). 8 bars instead of 16. (1400 rpm, hot).
3 - Nothing better. New purge.
4 - Check of valve body. K1 is good. But an internal piston was stuck. All internal pistons have been checked one by one and cleaned with ATF.
01-14-2021, 04:52 AM
