George993

It seems looping back would be easier than replacing the whole tandem pump with power steering only pump. I see instructions on looping back other Mercedes cars but can't find anything for R230 (pre-facelift early models). I see one connection from PS reservoir and next to it one outgoing connection which I assume is for PS.

On the ABC side there is reservoir feed, and 2 connections at the bottom - one going towards under the radiator where it splits in a block into 2 hoses. The other bottom connection has a pulsation dumper tube (not to be confused with the spherical pulsation dampers near the wheels) with banjo connections on them. Now how to take those 2 (or 3 if looking after the split under radiator) and feed them back into the reservoir? Or what exactly is the best loopback process? Has anyone got a description exactly of what each in/out hose of the tandem pump is for, and possibly which of them go into some normally closed valves so we don't have to worry about them? Thanks!

pmercury

iTrader: (2)

Hi

like this:
https://mbworld.org/forums/cl-class-...ping-pump.html

its on a W215 but shows you the idea











__________________________________________________ ______________________________
There are many choices for DAS/Xentry Diagnostics for MB.
Ensure you have the right information before getting one. There is too much misleading info.
I’m a forum member and programmer who’s learned the hard way. PM me if you have any questions.

George993

Thanks @pmercury, it is an excellent description which I have been studying, but I just can't map it easily into the R230, The return path with/without the ABC radiator and into the reservoir and back into the pump is straightforward.

But I'm totally confused where the W215 has only one connection in addition to the reservoir and the R230 has 2 - one going forward and splitting into 2 more, and one going to the back of the car through the cylindrical damper which is attached to the pump...

pmercury

iTrader: (2)

mmmmm if its a tandem pump you just eliminate the two hoses to steering
then you should have only two left
It was so long ago but I remember that just following the hoses was enough to figure out never had a picture other then I showed there

George993

Thank, but unless I'm looking at something wrong, I see 5 hoses (2 for PS and 3 for ABC), so that's why I'm confused :-(

pmercury

iTrader: (2)

are you going to remove all the system or just loop and let the whole system hang there ?

pmercury

iTrader: (2)

so

power steering return hose 58
power steering in hose 30i

ABC out double hose 59 (that's why you see 3 hoses maybe)
ABC return hose 58

pmercury

iTrader: (2)

this is the double output I guess
the hose with no end is there for shock damping

pmercury

iTrader: (2)

the ABC tank, the BIG one, is simple, top in, bottom out

pmercury

iTrader: (2)

here you see 50 to the output of the tank

George993

@pmercury, thank!!!, you are right, I was seeing it wrong, there are only 4 holes into the tandem pump and they just split and route after that. I have a SL500 (the pump photo above is from SL600) and part of my confusion was that where the ABC pressure lines 59 in the picture (and in other ABC pump pictures) go forward, in my SL500 there is a dumper there and a hose pointing to the back of the car. Thanks again.

George993

And yes, I want to keep the ABC pump unchanged and not removed except for the loopback

pmercury

iTrader: (2)

My pleasure !





__________________________________________________ ______________________________
There are many choices for DAS/Xentry Diagnostics for MB.
Ensure you have the right information before getting one. There is too much misleading info.
I’m a forum member and programmer who’s learned the hard way. PM me if you have any questions.

George993

BTW, here is the R230 V8 ABC pump loopback description with photos:

https://mbworld.org/forums/sl-class-...er-struts.html

R jarmoszko

so ok now I understand my misconception.. I was looking at the 215 loop around which made no sense as I am working on 230 like George!!
so I know George used his method but if I want to do Pmercury method what do I need to do as my abc pump is relatively new but will convert to PS pump only! HELP lift my fog!!
thanks!!

pmercury

iTrader: (2)

George is what to follow for a loopback
this means you keep your dual pump that does steering and ABC
you loop the ABC part you don't need for coilovers

bow if you want to swap the dual pump with a steering only pump you don't need to loop
just connect the steering and remove the whole ABC stuff

or didn't I get it ?

R jarmoszko

if I followed George method can I still convert to PS pump later??
also what’s your suggestion for an inexpensive scanner that can erase codes??
thx

pmercury

iTrader: (2)

you sure can

also, for the first price scanner to erase codes and some other things, this one:
https://mbworld.org/forums/sl-class-...10-review.html