SL300-24 Auto box issue

[jcev39]

Any ideas why I can't select 2nd on my gearbox? The box works perfectly well in all the other selector positions but it won't allow 2nd to be selected.
I'm a bit concerned this may be linked to the farce of my pre-christmas gearbox oil change...
Cheers
John

 

[television]

Not quite clear John, Do you have no drive if you select 2nd

 

[jcev39]

No, it drives perfectly well (and selects 1st gear and 2nd gear when in the Drive position) I just can't select it using the manual selection with the stick! Its like there's a detent / mechanism to prevent selection at speed (a bit like the systems used to prevent reverse engagement on a manual)...

 

[television]

I have forgotten dont you lift the stick or something to enter the gate

 

[BTB 500]

Is this a 4 speed or 5 speed box?

 

[television]

Is this a 4 speed or 5 speed box?

Good point, by 10-94 the 5 speed was standard

 

[jcev39]

I'm pretty sure its a 5 speed (listed as an option (425) on the original invoice at £576.79!!!). The car is a 92...

 

[television]

Yes the 5 speed was an option on the 24v engines

I wasa hoping that someone with oine would have posted on the tread.

I will send a PM to AndyK and ask

This is the shift
http://www.detali.ru/cat/oem_mb2.as...GM=717.450&CT=F&cat=15S&SID=26&SGR=090&SGN=04

 

[stats007]

The 5-speed auto (722.5) was an option on the 300SL, 300SL-24 and 500SL at the time - as was a 5-speed manual on the six-cylinder cars.

The 5-speed auto became standard on the SL320 for the 1994 model year, replacing the 300SL-24.

722.5 has a downshift lockout lever that engages at speed - so you physically can't select a lower gear. If you can't manually shift into second when slowing then this is where you should investigate.

 

[jcev39]

Its not just that I can't select it when slowing, I can't select it when stationary (engine running)! Any ideas what would make the lockout lever jam?

 

[stats007]

It is activated by control pressure so assuming it worked before the ATF change I can only assume this has changed? There is some adjustment to be had - alternatively the return springs could have failed. Perhaps a question for BlackC55?

 

[television]

It should go in when stationery maybe Ian would know as well

 

[whitenemesis]

Anything to do with the S/C mode switch?

 

[television]

Anything to do with the S/C mode switch?

Dont think so, iI think its more a gate maladjustment

 

[Ian B Walker]

If its a 5 speed then check the 5th gear solenoid (left hand side of the box, by the bell housing). I am led to believe that if the connections come off or are not correctly fitted then it causes shift problems.

 

[stats007]

If the gearbox shifts to 5th and back then this is unlikely to be the issue, however a fault code can easily be read as they have to be specifically erased, which may help.

 

[television]

If the gearbox shifts to 5th and back then this is unlikely to be the issue, however a fault code can easily be read as they have to be specifically erased, which may help.

I was thinking an adjustment issue, I will have a look in the morning but info on these is limited and much is still on Micro fische

 

[stats007]

If the gearshift physically can't be moved to 2nd then it has to be related to the locking lever. Not knowing fully how this works I would leave this to Ian or Olly who have no doubt had a few apart! From what I can see the piston is driven by control pressure (adjustable) and works against return springs. If the pressure is too low the lever locks to the lowest setting (2nd)?

 

[stats007]

 

[television]

Thank you Stats as said if there is anything I will post it up