I am replacing my PS pump on my 400e
I have everything apart to the 4 bolts that mount the pump

They are hex head bolts that come in from BEHIND the pump...who designed this !??

I can see the two outer bolts coming in from behind...but I have been unable to figure out what tool, or combo of tools is needed to get on the head, and have the room to turn it.

I cant even see the other two inner bolts..
so ANY help is appreciated here


THANKS!!

I'm assuming you're trying to remove the pump with its bracket as an assembly. If not, do that, but without a collection of wrenches with different offsets and origins you will find the task is near impossible.

__________________

90 300TE 4-M
Turbo 103, T3/T04E 50 trim
T04B cover .60 AR
Stage 3 turbine .63 AR
A2W I/C, 40 LB/HR
MS2E, 60-2 Direct Coil Control
3" Exh, AEM W/B O2
Underdrive Alt. and P/S Pulleys,
Vented Rear Discs, .034 Booster.
3.07 diffs 1st Gear Start

90 300CE 104.980
Milled & ported head, 10.3:1 compression
197° intake cam w/20° advancer
Tuned CIS ECU
4° ignition advance
PCS TCM2000, built 722.6
600W networked suction fan
Sportline sway bars
V8 rear subframe, Quaife ATB 3.06 diff

You need to remove the pump and mounting bracket as an assembly. Two bolts on the front and two bolts on the back. The back bolts are accessed from under the car with a long extension and wobble socket.

I hope this helps.

__________________
Mercedes Benz Master Tech - Retired

OK I see what you are saying

I have all the bolts holding the bracket off, besides the interior from-behind bolt

Any suggestions where to start from under to reach this last bolt?

I also did some more searching, and found this post here
http://www.peachparts.com/shopforum/tech-help/267052-help-e420-1994-power-steering-pump-removal.html

which links over to this DIY with pics
Photo DIY- Steering Pump Overhaul - Mercedes-Benz Forum

even tho thats a w140 and not a w124, the engine m104(?) is the same(the v8)

You cant even see it , with your left hand on long extension with universal joint attached feel for the bolt and guide your socket onto bolt, you insert socket around motor mount area with long extension, hex head 13mm if my memory is correct

Good morning, If the car is on a lift you can see that bolt if you look in the right spot but it is difficult. Like MBdoc said in that other post this is probably one of the most difficult ps pumps to r&r, but it can be done.
You will need a long extension possibly two and a 13mm wobble socket.

Like was mentioned in that other post, are you sure it's the pump leaking and not just the hose between the reservoir and the pump?

That hose can be replaced without removal of the pump. They are bad about leaking. If the inside of the drive pulley on the pump is dry and dusty then odds are the pump is not leaking.


[IMG][/IMG]

This is what I use, the extension is 24" and the wobble extension is 12".

I hope this helps, Robert

__________________
Mercedes Benz Master Tech - Retired