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Car Forum / Mercedes-Benz Cars / June 2007Transmission 1990 560 SEC
Until my car is fully warmed up to operating temperature the transmission shifts a little funny. Shifts are delayed...and then a little harsh. Once car is warm it shifts pretty much when you would expect...but still a bit on the harsh side. Is this adjustable? If so how? PS. I had a full flush, with new fluid and filter done in the fall before I put the car away for the winter...so I don't supect fluid. Also at that time the mechanic told me that the transmission looked to be in excellent condition. Any ideas would be greatly appreciated. Transmission up shifts ARE delayed before the motor is warm specifically to force a faster warm-up and so, lower emissions. These old, all hydraulic transmissions DO shift a bit harshly while cold vs. contemporary electronic transmissions that are linked to the motor's control unit which then retards ignition at the time of shift to depower the motor and so create a soft shift. 1980s mechanics vs. 2000s electronics.  Signature© 2007 T.G.Lambach. Publication in any form requires prior written permission. I would still check the fluid level... maybe you had a small leak Thank you for your responses I did recheck the fluid level, and it is fine. Back to my original question....is there any adjustment possible in both the shift points, and the harshness of the shift? If so how is it done? > Until my car is fully warmed up to operating temperature the transmission > shifts a little funny. [quoted text clipped - 8 lines] > > Any ideas would be greatly appreciated. GM, why do you assume there is a problem? Possibly the upshift delay is on purpose when cold.... hey, it's a Benz :-) cheers, guenter >Thank you for your responses >I did recheck the fluid level, and it is fine. [quoted text clipped - 15 lines] >> >> Any ideas would be greatly appreciated. Yes, there is adjustment for shift points and harshness... Harshness is adjusted at the vacuum modulator... round thing on driver side of the tranny... Counterclockwise soften the shift.... turn only 1/4 turn at a time. Point of shift when engine is hot is adjusted at the back of the fuel distributor... there is a bar linkage with two screws on the top... by shortenening the bar, you raise the shifting point... shift point at moderate acceleration should be around 2300RPM. Cold upshift cannot be adjusted...this is electronically controlled. |
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