722.6 Shift Quality Problems - Page 2 - PeachParts Mercedes-Benz Forum

JRS · #16 06-18-2009, 03:50 PM

You should have the drain plug on a '97.

gmercoleza · #17 06-18-2009, 04:18 PM

My upshifts are not rough, but the 2 -> 3 shift occasionally flares if you really jump on it. It only occurs when hot after extended driving. I am not the original owner but have 2 receipts for prior tranny fluid/filter services. Car has just under 180,000 miles but otherwise runs as new.

loubapache · #18 06-18-2009, 04:39 PM

There are many springs that control various shifting tasks. The 2 -> 3 itself has three separate springs. See diagram.

When you do change the fluid the next time, just check them one at a time.

jcyuhn · #19 06-18-2009, 05:40 PM

Quote:

Originally Posted by glenmore

Is the procedure, unhook line, turn on car and wait until the majority of old fluid is pumped out?

That pretty much covers it. Takes about 5-10 seconds and there is perhaps a pint of fluid remaining in the pan when done. Probably the best way for a DIY to flush the trans would be to pump it dry, shut off the car, add a liter of ATF, start the car. Repeat until the ATF being dumped into the catch pan becomes sufficiently clean for your tastes. The difference between old and new fluid is rather obvious - the new stuff is cherry red, the old is brown/black due to the suspended graphite from the clutch material.

jcyuhn · #20 06-18-2009, 05:42 PM

Quote:

Originally Posted by loubapache

The 1997 has a torque converter drain plug. For 722.6 up to model year 99, there is a spring (Pressure Control Valve Spring) that tends to collapse or break. When that happens, the up-shifts will be rough, especially 2 -> 3 and 3 -> 4. So when you change fluid, definitely check that spring and it only costs $2. See the diagram.

For jcyhun, the design changed but the spring could still experience problem, therefore affecting shifting quality. It is too late to check now because the oil pan has to come off.

I recently had to replace the conductor plate on my 1997 E320 and bought several of these springs just in case when I had the valve body out of the car. Mine did not break but was collapsed.

Doubt I have an issue, the shift is sometimes just barely perceptible. Under light acceleration I expect it to be imperceptible. Holding the car to a high standard here.

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