06 S65 Spurious Gearbox drop out of gear issues - Page 7 - Mercedes-Benz Forum
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post #61 of 71 (permalink) Old 01-02-2018, 12:01 PM
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Nice, when did you get a lift??? It's not much warmer in my steel building.

If you've removed the valve body before to replace the conductor plate, I suspect that you've already pulled the solenoids when doing this. There should be four on one side and two on the other, underneath a cover.
There's a guy on youtube called Diesel Mercedes that has some great videos:

Also look up sonax kits which you can probably do at the same time and does not cost a lot : https://www.sonnax.com/parts/2317-ma...lve-sleeve-kit
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With best regards

Al

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post #62 of 71 (permalink) Old 01-03-2018, 09:32 AM Thread Starter
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Thanks Al much appreciated. I have had the lift for a few years now - sort of necessary with my hobby.

Looking back to when I changed out the conductor plate I may have screwed something up. I tried to keep everything really clean but maybe I introduced some crap into the valve body.

With it being very cold and the car not engaging D or R until the fluid warms up and even then it thumps into gear. Once she is rolling not more issues.

Thanks for the links - very interesting and certainly worth a try. Solenoids are about $50 each- is it worth changing them all? Can they be tested?

Any advice on cleaning/flushing the valve body?

Thanks Roger
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post #63 of 71 (permalink) Old 01-03-2018, 06:29 PM
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Roger,

I believe that the kid that works for me used brake clean on his when he put a 722.6 in a diesel 124 wagon. Before ordering new solenoids, you might want to check part #'s. The 722.6 went into many engines from a C230 with a 1.8l 4 cylinder to the twin turbo v12 in the S65, they may not all be equal. Also check your Email, I might have a last ditch solution for you in case all others fail.

With best regards

Al

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post #64 of 71 (permalink) Old 01-04-2018, 12:20 AM
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Hi,

Over here in UK, decent Auto Trans Shops have what is called a "Hydra Test" Machine, which a Valve Block assembly is bolted into a Machine and tested Electronically and Hydraulically

I know the USA makes it's own Machine, can't remember the brand name of it now ........ "Hydra Test" is a UK Brand, built and sold by a friend of mine, which deals more specifically with the Brands of Auto Transmissions in UK

Would it not be far more cost effective to find a decent Trans Shop with such a machine, perhaps phone round some MB Indies to get a recommendation, and pay them a few bucks to check and repair your Valve Block if necessary ??

Just a thought, because back in my Transmission building days if I ever had a suspected Valve Block problem I would always bung it on the Hydra Test Machine

However, in my experience, unless I was getting a bad Solenoid Code, the Valve Blocks themselves were very rarely at fault

HTH,

Cheers Dave

Last edited by Dave2302; 01-04-2018 at 12:26 AM.
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post #65 of 71 (permalink) Old 02-08-2019, 08:48 AM
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Roger,


Good morning. Wanted to find out if you found what's wrong with your car. I have 04 S500 with very similar problems. Please let us know. Thank you
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post #66 of 71 (permalink) Old 02-09-2019, 08:19 AM Thread Starter
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Hi Paaw7541 - well I did everything I could bar have the gearbox rebuilt. Correctly flushing the system solved most of the issue but alas it was still there but less frequent.
I was at the point of having the gearbox rebuilt when I blew the engine (another thread). About a year later I am in the process of replacing the engine and gearbox.
So if you have fully flushed the system, changed the round connector and conductor plate, rebuild is on the cards.
Good luck.
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post #67 of 71 (permalink) Old 02-12-2019, 03:05 PM
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Thank you Roger for letting us know. Wojtek
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post #68 of 71 (permalink) Old 05-26-2019, 04:50 AM
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Like wise issue solved on 08 SL65

Quote:
Originally Posted by ROG100 View Post
2006 S65 Gearbox 722.6

Gearbox will drop out of gear or hold a particular gear every now and then. No rhyme or reason.
Drove 800 miles to FL and it did it twice. Slow down or stop and it comes back. Worst is when the gear is not engaged and the engine just revs until you realize it is out of gear.
800 mile return trip never missed a beat. This was hard driving.
Short run to the local shop and it does it again. Then nothing for a couple of weeks.

About 12 months ago I replaced the conductor plate when the screw holding the connector sheared. Box was clean and fluid replaced. Correct MB connector, conductor plate and fluid. Same for the gasket and filter.

I just pulled the TCU to check for fluid wick contamination and all clean.

I plan to drain and pull the pan as well as check the connector again. I have another conductor plate ready as well.

Any pearls of wisdom from the W220 tifosi?


Quote:
Originally Posted by Paaw7541 View Post
Thank you Roger for letting us know. Wojtek
I have gone through the same issues and I'm posting my resolve in the R230 thread under

08 SL65 Spurious Gearbox drop out of gear issues [Solved] intro

https://www.benzworld.org/forums/r23...l#post17797008

For those off you that have contributed to this issue here and like to find out more I'm posted the link here.

Thanks for all your time spend
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post #69 of 71 (permalink) Old 05-28-2019, 05:07 PM
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Anyone have a shifter wiring diagram 2000 s430... Mine pulls no communication codes and was woundering the symptoms of bad shifter module
post #70 of 71 (permalink) Old 05-28-2019, 05:09 PM
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Do u know the location of antitheft module. 2000 s430 mercedes
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