Auto Transmission Oil Filter change
I am trying to find out whether there are one or two filters in the automatic gearbox. The symptoms appear to be that when going up through the gears, third gear seems to go up to 3,500 revs before changing up and is not a smooth action.
The service history states that the auto transmission fluid was changed 3,000 miles ago and looks clean when checking the dipstick, there is no record of a filter being changed at that time. I have also been told that there may be a second filter which just needs cleaning out and replacing, however, I cannot see any evidence of this on any information I have seen.
The Chassis No is WDB4632827076123 and I guess everything is original.
Would be grateful for any information or ideas please.
On a 463, the auto transmission has one filter. What you describe sounds like a possible issue with either vacuum lines or the throttle linkage cable adjustment, which determine the change points. Check also that the fluid level is correct.
The throttle linkage determines the shift points and the vacuum modulator determines the shift quality.
First adjust the throttle cable to ensure there is no slack with the accelerator pedal, Then adjust the gearbox link cable in a similar way, so there is not slack there too.
The shift quality can be adjusted by tuning a valve on the vacuum modulator on the side of the gearbox.
There are many YouTube videos on this (W124, 300E etc) eg:
You should in any case upgrade the modulator (second video) as these were much improved after 1993.
A failing exhaust catalytic converter will make the engine considerably more noisy and resonant.