Automatic transmission not engage
#226
Racer
Thread Starter
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I agree with you Fred. But I try to remember all events to find any correlation. ![Smilie](https://rennlist.com/forums/images/smilies/smile.gif)
Now, I have to see how to save time, my tranny, and money.![Big Grin](https://rennlist.com/forums/images/smilies/biggrin.gif)
What to do ?
- Check PSD ? We have seen that the link between tranny and differential is good since park pawl locks the wheels (see last Greg's post).
- Check TC by opening drain plug just after the engine is stopped ?
- Check valve body again ?
- Change TC (réf. 722 250 09 02) ? Any good shop to buy it at the best price ?
All ideas are welcome !!!
Thank you again for you very good support, you're the best !
![Smilie](https://rennlist.com/forums/images/smilies/smile.gif)
Now, I have to see how to save time, my tranny, and money.
![Big Grin](https://rennlist.com/forums/images/smilies/biggrin.gif)
What to do ?
- Check PSD ? We have seen that the link between tranny and differential is good since park pawl locks the wheels (see last Greg's post).
- Check TC by opening drain plug just after the engine is stopped ?
- Check valve body again ?
- Change TC (réf. 722 250 09 02) ? Any good shop to buy it at the best price ?
All ideas are welcome !!!
![thumbup](https://rennlist.com/forums/graemlins/thumbup.gif)
Thank you again for you very good support, you're the best !
#227
Former Vendor
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Let's look at it another way....if it's not the converter, what else can it possibly be?
The torque tube/torque tube shaft is apparently good.
The valve body has been rebuilt.
The axles are apparently good.
The transmission has been rebuilt.
The car will not roll in park, which indicates the differential/ring and pinion are good.
System pressure is???
The torque tube/torque tube shaft is apparently good.
The valve body has been rebuilt.
The axles are apparently good.
The transmission has been rebuilt.
The car will not roll in park, which indicates the differential/ring and pinion are good.
System pressure is???
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Schocki (06-02-2021)
#228
Racer
Thread Starter
#229
Rennlist Member
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Has anybody inspected the drive shaft splines?
#230
Racer
Thread Starter
#231
Rennlist Member
![Default](https://rennlist.com/forums/images/icons/icon1.gif)
Let's look at it another way....if it's not the converter, what else can it possibly be?
The torque tube/torque tube shaft is apparently good.
The valve body has been rebuilt.
The axles are apparently good.
The transmission has been rebuilt.
The car will not roll in park, which indicates the differential/ring and pinion are good.
System pressure is???
The torque tube/torque tube shaft is apparently good.
The valve body has been rebuilt.
The axles are apparently good.
The transmission has been rebuilt.
The car will not roll in park, which indicates the differential/ring and pinion are good.
System pressure is???
The following users liked this post:
Fabien92 (06-02-2021)
#232
Racer
Thread Starter
![Default](https://rennlist.com/forums/images/icons/icon1.gif)
Regarding WSM, we have to measure a pressure of 15.8 bars +/- 1.
Last edited by Fabien92; 06-02-2021 at 01:14 AM.
#233
Nordschleife Master
![Default](https://rennlist.com/forums/images/icons/icon1.gif)
One thing that I have not seen having been done is to do an aircheck on the transmission.
This is a common procedure for other transmissions to ensure that a seal didn't get damaged on install (it happens to the best people every now and then).
I also see from the pictures that the pressure modulator was not removed for overhaul. Remove it and check the plunger that typically stays inside the transmission.
When you had the converter out, did you happen to take a picture of the inside with all the fluid removed. I see the splines for the fixed shaft are ok. But is there any spline damage in the turbine portion?
I also really think that you have an issue with the valve body and that the valve body should be swapped to a known good unit (after completing an air check and ensuring that you don't have any major seal leaks.
This is a common procedure for other transmissions to ensure that a seal didn't get damaged on install (it happens to the best people every now and then).
I also see from the pictures that the pressure modulator was not removed for overhaul. Remove it and check the plunger that typically stays inside the transmission.
When you had the converter out, did you happen to take a picture of the inside with all the fluid removed. I see the splines for the fixed shaft are ok. But is there any spline damage in the turbine portion?
I also really think that you have an issue with the valve body and that the valve body should be swapped to a known good unit (after completing an air check and ensuring that you don't have any major seal leaks.
The following users liked this post:
Fabien92 (06-02-2021)
#234
Racer
Thread Starter
![Default](https://rennlist.com/forums/images/icons/icon1.gif)
One thing that I have not seen having been done is to do an aircheck on the transmission.
This is a common procedure for other transmissions to ensure that a seal didn't get damaged on install (it happens to the best people every now and then).
I also see from the pictures that the pressure modulator was not removed for overhaul. Remove it and check the plunger that typically stays inside the transmission.
When you had the converter out, did you happen to take a picture of the inside with all the fluid removed. I see the splines for the fixed shaft are ok. But is there any spline damage in the turbine portion?
I also really think that you have an issue with the valve body and that the valve body should be swapped to a known good unit (after completing an air check and ensuring that you don't have any major seal leaks.
This is a common procedure for other transmissions to ensure that a seal didn't get damaged on install (it happens to the best people every now and then).
I also see from the pictures that the pressure modulator was not removed for overhaul. Remove it and check the plunger that typically stays inside the transmission.
When you had the converter out, did you happen to take a picture of the inside with all the fluid removed. I see the splines for the fixed shaft are ok. But is there any spline damage in the turbine portion?
I also really think that you have an issue with the valve body and that the valve body should be swapped to a known good unit (after completing an air check and ensuring that you don't have any major seal leaks.
We have changed all seals and o-rings in the transmission.
Are you sure about the pressure modulator ? If I remember, the transmission housing was empty of all parts. See picture.
We have not checked the splines in the turbine portion .. no picture inside TC. Oups ...
![](https://cimg8.ibsrv.net/gimg/rennlist.com-vbulletin/2000x1504/img_e1021_d2c4488f2400865b2f0466ce5ebe95c71a64af12.jpg)
Last edited by Fabien92; 06-02-2021 at 01:44 AM.
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Fabien92 (06-02-2021)
#236
Racer
Thread Starter
#238
Racer
Thread Starter
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But where the working pressure is it sampled in the ATF flow via this port ? I mean, if it’s just at the output of the TC, we can have a failed TC or front pump, and a good valve body.
About working pressure itself. The car can it drive with only 8 bars ?
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Fabien92 (06-02-2021)
#240
Rennlist Member
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I don't think you would like to drive your car with 50 % fuel or oil pressure present either. Bottom line: check the pressure and then we'll know more.
Last edited by Schocki; 06-02-2021 at 05:01 AM.
The following 2 users liked this post by Schocki:
Bertrand Daoust (06-02-2021),
Fabien92 (06-02-2021)