SL/R129: My sl gearbox looks like it s slipping
06-16-2021, 06:45 AM
#1
Newbie
Thread Starter
Join Date: Oct 2017
Posts: 4
Likes: 0
Received 0 Likes
on
0 Posts
1992 SL 300-24
My sl gearbox looks like it s slipping
Hello,
A few years ago, I bought a 1992 SL 300-24. The car was neglected and had been in an impound lot since 2004. When I got it, it was missing some fun stuff like the roof-computer, it would not run as the ignition module died while standing and if i would continue typing this would become a very loing post...
Most of the issues could be resolved using the online community, but the last one seems to be hard:
The engine runs fine, gearbox engages fine, but especially when it is cold it sometimes slips to 1 or 2 gears lower, other times it s as it just does not engage properly, not that I am accelerating very hard,it s mostly when you try to maintain a certain speed 50km/h or 70km/h and it gets a little resistance when it gets a little hilly.. This is not very noticeble any more when the car has been driven some km (10-15).
- Changed oil and filter in gearbox + torque converter (Febi oil), it is at max when hot and running
- changed the EZL back to a siemens unit as it was originally equiped (now have a bosh spare)
- took out the microswitch in the gearstick assembly. It was readig a resistance, opened it up cleaned the contacts, now reads ok
- adjusted bowden cable
The only thing that is still on my todo is try and disconnect the kickdown switch at the pedal,
Not sure if anyone else has experienced this behaviour in a 5speed transmission. What else could be causing this?
A few years ago, I bought a 1992 SL 300-24. The car was neglected and had been in an impound lot since 2004. When I got it, it was missing some fun stuff like the roof-computer, it would not run as the ignition module died while standing and if i would continue typing this would become a very loing post...
Most of the issues could be resolved using the online community, but the last one seems to be hard:
The engine runs fine, gearbox engages fine, but especially when it is cold it sometimes slips to 1 or 2 gears lower, other times it s as it just does not engage properly, not that I am accelerating very hard,it s mostly when you try to maintain a certain speed 50km/h or 70km/h and it gets a little resistance when it gets a little hilly.. This is not very noticeble any more when the car has been driven some km (10-15).
- Changed oil and filter in gearbox + torque converter (Febi oil), it is at max when hot and running
- changed the EZL back to a siemens unit as it was originally equiped (now have a bosh spare)
- took out the microswitch in the gearstick assembly. It was readig a resistance, opened it up cleaned the contacts, now reads ok
- adjusted bowden cable
The only thing that is still on my todo is try and disconnect the kickdown switch at the pedal,
Not sure if anyone else has experienced this behaviour in a 5speed transmission. What else could be causing this?
09-01-2021, 05:44 AM
#2
Newbie
Thread Starter
Join Date: Oct 2017
Posts: 4
Likes: 0
Received 0 Likes
on
0 Posts
1992 SL 300-24
Replaced the gearbox because the solenoid was shot and found a lot of particles in the oil. Replaced with a good one, still skips 4th gear, the sensor on the bottom at the end seems to be faulty and cannot be replaced solely, you need the wiring harness for the gearbox. Does anyone know the specifics of this sensor. VDO could possibly help but they need info.
09-09-2021, 07:48 PM
#3
Junior Member
Replaced the gearbox because the solenoid was shot and found a lot of particles in the oil. Replaced with a good one, still skips 4th gear, the sensor on the bottom at the end seems to be faulty and cannot be replaced solely, you need the wiring harness for the gearbox. Does anyone know the specifics of this sensor. VDO could possibly help but they need info.
