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  #1  
Old 11-02-2015, 12:11 AM
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1982 automatic 722.312 valve body:

i have changed the filter on this transmission twice because it was not going into any gear when i purchased it. but it now will drive pretty good as long as i don't shut it off! if i do i have to wait about 10 or 12 minutes before it will go into gear again, drive or reverse! i was told it is probably the valve body. can this part be just cleaned and replaced with a new gasket. i have seen how intricate it is but i have been working on cars for over 30 years but not mercedes. thanks in advance for any info. p.s. i have read the numerous post on this subject but am unclear about the process for cleaning the valve body without a kit.

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  #2  
Old 11-02-2015, 07:01 AM
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Originally Posted by dmoorman View Post
i have changed the filter on this transmission twice because it was not going into any gear when i purchased it. but it now will drive pretty good as long as i don't shut it off! if i do i have to wait about 10 or 12 minutes before it will go into gear again, drive or reverse! i was told it is probably the valve body. can this part be just cleaned and replaced with a new gasket. i have seen how intricate it is but i have been working on cars for over 30 years but not mercedes. thanks in advance for any info. p.s. i have read the numerous post on this subject but am unclear about the process for cleaning the valve body without a kit.
I assume the engine starts after you've used the car and that it is the gear selector lever stopping you from selecting reverse.

Can you confirm?

If you shut off the engine in neutral (rather than park) and then start it again can you select drive?

Again please confirm / deny!

[There's a safety lock out for selecting reverse - if the transmission "thinks" the car is going faster than about 10kph you can not select reverse. This is a signal from the governor]

{If you remove the valve body you should ideally replace the gasket before refitting it. Many people don't.

It is not uncommon for people to find broken springs in valve bodies.}
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  #3  
Old 11-02-2015, 06:32 PM
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valve body 722.312

thanks for the reply Stretch, i might not have been clear on what i told you but, i found out through trial and error that if i leave the car running when i go somewhere in either park or neutral it will take off in any gear. it is only when i put it in park or neutral and shut the engine off for a brief amount of time it will not go into drive or reverse for about 10 or 12 minutes. pretty annoying when you pull up and get gas and get back in the car and have to push it to the side out of the way for a few minutes. was told by a mechanic from Houston that it is probably the valve body. said he could repair it for 250.00. i like to see what makes things tick for my self if possible so would like to try it for myself first! with guidance of course thanks again.
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Old 11-02-2015, 06:39 PM
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How long does the car need to sit with the engine off in order for it not to engage D or R then next time you start it?

There have been reports of valve bodies gumming up and not working.

Work up some pressure gauges and look at line pressure. There is a thread somewhere here where someone tested pressures.
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Old 11-02-2015, 06:41 PM
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I just saw your update that shutting off = instant no drive next start.

Do a line pressure test, this will let you know if the pressure regulator is stuck open.
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Old 11-02-2015, 06:53 PM
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is the pressure regulator located in the valve body. because it seems that some thing is sticking.
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  #7  
Old 11-02-2015, 07:01 PM
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what course of action do you take if you find broken springs in the valve body since they say there in no kit for it.
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  #8  
Old 11-03-2015, 04:51 AM
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There are "superior shift kits" available for some 722.3 transmissions but I get the feeling this is more often than not a diesel engine with automatic transmission thing...

...the Mercedes dealerships still offer very good spares support and there's a classic centre in California.

If you are doing this job yourself you are indeed best off starting with some measurements.

Other simple things such as checking the fluid for cleanliness - the correct fluid level - checking shifter bushings should also be done before you start to remove parts.
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1992 W201 190E 1.8 171,000 km - Daily driver
1981 W123 300D ~ 100,000 miles / 160,000 km - project car stripped to the bone
1965 Land Rover Series 2a Station Wagon CIS recovery therapy!
1961 Volvo PV544 Bare metal rat rod-ish thing

I'm here to chat about cars and to help others - I'm not here "to always be right" like an internet warrior



Don't leave that there - I'll take it to bits!
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  #9  
Old 11-03-2015, 10:43 AM
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transmission linkage and bushings are fine. it shifts into each slot okay. it starts perfectly at all times. there is a disconnect when i shut the engine off for a brief period of time after driving for any period of time. it just won't pull it self in any direction until its had a chance to sit for about 10 minutes. then it will pull okay or back-up fine until i stop again and put it in park or neutral and shut the engine off. if i leave it running it will pull off in any gear just fine. the key is when i shut it off!
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  #10  
Old 11-03-2015, 11:28 AM
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Thing is round here at least leaving your engine running whilst re-fueling kind of pisses off the fuel station people...
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1992 W201 190E 1.8 171,000 km - Daily driver
1981 W123 300D ~ 100,000 miles / 160,000 km - project car stripped to the bone
1965 Land Rover Series 2a Station Wagon CIS recovery therapy!
1961 Volvo PV544 Bare metal rat rod-ish thing

I'm here to chat about cars and to help others - I'm not here "to always be right" like an internet warrior



Don't leave that there - I'll take it to bits!
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  #11  
Old 11-03-2015, 06:07 PM
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You need to install a pressure gauge on the trans line pressure and watch it. ( there will be some pressure taps on the side of the case. )

I also wonder if this still has a rear pump and the switch over circuit is having a problem.
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  #12  
Old 11-03-2015, 09:59 PM
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Quote:
Originally Posted by Stretch View Post
There are "superior shift kits" available for some 722.3 transmissions but I get the feeling this is more often than not a diesel engine with automatic transmission thing...

...the Mercedes dealerships still offer very good spares support and there's a classic centre in California.

If you are doing this job yourself you are indeed best off starting with some measurements.

Other simple things such as checking the fluid for cleanliness - the correct fluid level - checking shifter bushings should also be done before you start to remove parts.


They have a gasser kit too, it is in my W126 300SEL -

Superior Transmission - Superior K722A-G

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