Date registered: May 2005
Vehicle: 1991 300SEL W140, Brabus, W220 facelift
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Since all gears (even reverse) do not work, I would suspect transmission oil pressure failure.
Pressure can be measured by putting a banjo bolt whith manometer connected instead of the 8 mm bolt, which is located on the right side of the tranny above the oil pan opposite to the gear shift lever.
The pressures should be very high (some 12-13 bars).
If you do not have access to manometer etc., you can simply loosen the bolt very slightly. Due to the very high pressure, oil should then flow out with engine running (the bolt has to be tightened very well to stop leaking).
If pressure is not as it should be, the problem could be the fluid pump itself (you already tried the filter). It could also be a heavy internal leak in the transmission, but I cannot see a common place, which could cause all gears not to work.
The pump is integrated with the front cover of the transmission (when converter is removed), and it can be rebuild at low cost.
... but of course you neet to take out the tranny to do the job.
1991 300SEL W140, Brabus, W220 facelift
1987 190E 2,3
1987 Honda Accord 2,0
Last edited by Minnet; 05-10-2010 at 02:32 PM.