K1, K2 and B1 722.4 valve replace - PeachParts Mercedes-Benz Forum

spock505 · #1 07-22-2016, 08:14 PM

Being a bit 'needy' at the moment so bear with me. Lots of DIY project lined up so going through the process of ordering parts/tools ect..

Having read most of the threads on this subject I was fairly confident on what was what, that was until it came to ordering - anyone that has ordered these bits probably knows they are only listed under another model, to find them my MB dealer followed one of the threads on here to access part numbers.

Parts have now arrived so wanted to run a quick check as to their roles.

K1 - part number A 126 270 44 77

This replaces the internals (not the outer case) for K1 valve located to the right next to B1

Okay, this is where it gets a bit tricky as not sure which one is K2 or B1 - as they are different colours my approach here would be to match like for like on removal.

K2 or B1 - part number A 126 270 04 35

K2 or B1 - part number A 126 270 05 35

Thanks all.

spock505 · #2 07-22-2016, 08:18 PM

Just to add, both of those kits two kits do say K2, but detailed afterwards 'Trans piston Kit' or 'Valve body' ?

Stretch · #3 07-23-2016, 05:22 AM

I can't tell for sure as I've not had a 722.4 valve body to bits before. However - and I could be wrong about this so don't panic if you are indeed that "needy"! - I've got a feeling you've got two parts for one bit. I think you only get one of those big sliding things for each of the actuating mechanisms...

...some of the positions for things might be comparable with the 722.303 valve body I took apart here =>

722.303 in bits photo shoot

This is at least a valve body for a "diesel" transmission (meaning transmissions for petrol engines are often a bit different). May be there are enough similarities in that information to help you make an educated guess?

spock505 · #4 07-23-2016, 06:28 AM

Quote:

Originally Posted by Stretch

I can't tell for sure as I've not had a 722.4 valve body to bits before. However - and I could be wrong about this so don't panic if you are indeed that "needy"! - I've got a feeling you've got two parts for one bit. I think you only get one of those big sliding things for each of the actuating mechanisms...

...some of the positions for things might be comparable with the 722.303 valve body I took apart here =>

722.303 in bits photo shoot

This is at least a valve body for a "diesel" transmission (meaning transmissions for petrol engines are often a bit different). May be there are enough similarities in that information to help you make an educated guess?

Thanks bud and good tip:-

"some of the slotted heads on the screws were burred. To avoid this from happening to you, my advice is to not use normal screw drivers but to use a bit and a 1/4" drive ratchet."

This is the excellent (cheers DieselPaul) thread myself and very helpful MB parts chap followed:

722.4 K2 Spring Part Number

tbh we have ordered the exact same as DieselPaul which is okay given we don't know the parts for K2 until removed, however it doesn't cover B1 which was my mistake.

Helpful layout pictures from MB org, thanks -

So in short, it looks like I don't have the B1 valve - hopefully the K1,K2 will be enough to reduce/eliminate flare.

P.S is there anything you haven't taken apart

Stretch · #5 07-24-2016, 01:52 AM

Quote:

Originally Posted by spock505

...

P.S is there anything you haven't taken apart

In the big scheme of things there's a lot of stuff that is just begging for it - fortunately I only dismantle my own stuff!

spock505 · #6 07-25-2016, 05:32 PM

Just checking a few things before starting job tomorrow.

The flux capacitor shown here in a fetching orange hue, can you alter the vacuum by twiddling the white cap or does it have to be removed accessing the 'T' bar ?

..ta folks

Stretch, maybe think about setting up a Euro version of Mercedes Source, your attention to detail is superb.

Stretch · #7 07-26-2016, 02:43 AM

Quote:

Originally Posted by spock505

Just checking a few things before starting job tomorrow.

The flux capacitor shown here in a fetching orange hue, can you alter the vacuum by twiddling the white cap or does it have to be removed accessing the 'T' bar ?

..ta folks

Stretch, maybe think about setting up a Euro version of Mercedes Source, your attention to detail is superb.

The T bit pulls out slightly to allow you to change the setting

spock505 · #8 08-10-2016, 09:56 AM

All three valves are internal, lots of discussion on their individual functions with many reporting success by just changing K1.

tbh, for the work involved and cost of fluid may as well do all three, less than $20 for the set.

Quote:

Originally Posted by spock505

Thanks bud and good tip:-

"some of the slotted heads on the screws were burred. To avoid this from happening to you, my advice is to not use normal screw drivers but to use a bit and a 1/4" drive ratchet."

This is the excellent (cheers DieselPaul) thread myself and very helpful MB parts chap followed:

722.4 K2 Spring Part Number

tbh we have ordered the exact same as DieselPaul which is okay given we don't know the parts for K2 until removed, however it doesn't cover B1 which was my mistake.

Helpful layout pictures from MB org, thanks -

So in short, it looks like I don't have the B1 valve - hopefully the K1,K2 will be enough to reduce/eliminate flare.

P.S is there anything you haven't taken apart

spock505 · #9 07-30-2016, 01:22 PM

Cheers DB, here's the full list from EPC - initially I sent the parts guy a link to the thread above which helped, however it wasn't until he clicked on the 'spanner' icon (285) did it reveal the list contained below.

Stretch · #10 07-31-2016, 01:58 AM

Sounds like the parts guy is a bit of a spanner if he hadn't worked that out before!

spock505 · #11 08-09-2016, 09:11 AM

Hello folks, Mr Needy again (there is a rationale to this mega DIY, my neighbors are away so going crazy to get everything finished).

Okay, B1 kit on it's way from MB Germany with another 6 liters of ATF and filter.

i wanted to thoroughly check out the vacuum system before replacing b1 just in case modulator valve was on the blink, and..yup may need replacing. The system overall is good, crossover and manifold works as should, everything else holds a vacuum... except one..the modulator. Now this may be a result of tweeking it to soften the change prior to B1 being fitted as detailed above, the problem no is it holds no vacuum at all or very little, question is this correct or perhaps diaphragm punctured?

Black nylon to transmission.

Last question (for today

is this ball joint supposed to be connected to anything? - it has always been like this so assumed not, the other end connects to injector pump accelerator linkage.

Thanks all

Stretch · #12 08-10-2016, 01:56 AM

Usually if there's a little ball joint on an accelerator linkage there's a reason for it! Check in the FSM chapter 30 I'm not familiar with the set up on your car (which ever one this one's about)

spock505 · #13 08-10-2016, 09:40 AM

Quote:

Originally Posted by Stretch

Usually if there's a little ball joint on an accelerator linkage there's a reason for it! Check in the FSM chapter 30 I'm not familiar with the set up on your car (which ever one this one's about)

My thoughts are it's for cruise control, engine is OM606.910 fitted to S124

Stretch · #14 08-10-2016, 10:48 AM

Quote:

Originally Posted by spock505

My thoughts are it's for cruise control, engine is OM606.910 fitted to S124

It might very well be but in my experience Mercedes doesn't like to do "standard". So if you haven't got cruise control fitted (and it was always like that) then I'd expect to see a different bell crank dangle thang...

...special type for this - special type for that - all related - all awkward - all almost the same but actually quite different...

spock505 · #15 08-10-2016, 11:41 AM

Quote:

Originally Posted by Stretch

It might very well be but in my experience Mercedes doesn't like to do "standard". So if you haven't got cruise control fitted (and it was always like that) then I'd expect to see a different bell crank dangle thang...

...special type for this - special type for that - all related - all awkward - all almost the same but actually quite different...

Just pulled this up on EPC - part is listed with the following note - Only used with Tempomat (cruise control)

I tried this before on EPC but it directs you to microfish system, this time as I backed out (up arrow key) it went into the detail pages, very odd - mind you, EPC can be a bit quirkey to navigate around.

Any ideas on the orange flux capacitor thingy?