News:

The W116 Library
The definitive W116 resource!

Main Menu

Recent posts

#1
Mechanicals / Re: High control pressure
Last post by Feather535 - Yesterday at 09:42 PM
Quote from: raueda1 on Yesterday at 07:17 PMThe filter is indeed inside one of the fuel line fittings, the larger of the 2

Just to be clear, what do you mean it's inside one of the fuel line fittings?  I removed both external fittings from the WUR (the larger one is the return) and they are just orifices-nothing inside.  Is the screen inside the WUR beneath where the fitting screws in?

On the M110 the WUR is under the intake manifold, only accessible from below.  Working under there is indeed like being in a rabbit hole...maybe worse.
#2
Mechanicals / Re: High control pressure
Last post by raueda1 - Yesterday at 07:17 PM
Quote from: Feather535 on Yesterday at 05:15 PM
Quote from: ramiro on Yesterday at 04:36 PMI think that your WUR is the problem high control pressure is how the usally fail, it has a mesh filter in the inlet did you check that,

Where is that filter?  I disconnected the hard lines from the WUR and removed the adaptors they connect to, but there is no filter there.  If it's inside the WUR, I'll probably need to remove it from the car to access it.
Uhoh, now you're down the rabbit hole!  You will absolutely need to remove the WUR.  The filter is indeed inside one of the fuel line fittings, the larger of the 2 if I recall.  It's very fine mesh.  To clean it you'll need to take the damn thing apart and blow it out with carb cleaner.  This is described here someplace, best to do a search.  When you open the WUR you'll see 4 flat-head screws that need to be removed.  Be careful, they are VERY tight and hence easy to strip.  Put the WUR in a vise to do loosen them.  And handle the thin steel membranes with the utmost caution.  Cheers, 
#3
Mechanicals / Re: High control pressure
Last post by Feather535 - Yesterday at 05:15 PM
Quote from: ramiro on Yesterday at 04:36 PMI think that your WUR is the problem high control pressure is how the usally fail, it has a mesh filter in the inlet did you check that,

Where is that filter?  I disconnected the hard lines from the WUR and removed the adaptors they connect to, but there is no filter there.  If it's inside the WUR, I'll probably need to remove it from the car to access it.
#4
Mechanicals / Re: High control pressure
Last post by ramiro - Yesterday at 04:36 PM
As far as i know if they fail petrol will come out of the other end , i can't really believe how it could change the pressure permantly , and also when you meassure the control pressure the pressure damper is not connected normally because you are connecting the Gauge between the WUR and the Fuel Distributor.

I think that your WUR is the problem high control pressure is how the usally fail, it has a mesh filter in the inlet did you check that, worth a try before opening the WUR?

#5
Mechanicals / Re: High control pressure
Last post by daantjie - Yesterday at 02:54 PM
Quote from: Feather535 on Yesterday at 12:10 PMNow I'm looking at the WUR and all the related plumbing on this 280SE.  It's hard to see under the intake manifold and even harder to access--but there appears to be another pressure regulator in the return line downstream of the WUR before it goes back to the fuel distributor.  The factor CIS manual calls it a pressure damper.  What does this thing do?  Do they ever go bad?  It looks similar to the pressure regulators in Bosch pulsed injections systems, which have been known to fail.

Exactly yes this is a pressure damper to smooth out fuel pulses and yes they do fail.  Best to replace but brace yourself for the price  :o
#6
Mechanicals / Re: High control pressure
Last post by Feather535 - Yesterday at 12:10 PM
Now I'm looking at the WUR and all the related plumbing on this 280SE.  It's hard to see under the intake manifold and even harder to access--but there appears to be another pressure regulator in the return line downstream of the WUR before it goes back to the fuel distributor.  The factor CIS manual calls it a pressure damper.  What does this thing do?  Do they ever go bad?  It looks similar to the pressure regulators in Bosch pulsed injections systems, which have been known to fail.
#7
Shop / Re: 6.9 for sale (auction) in ...
Last post by nathan - Yesterday at 07:51 AM
Thanks Skaluke.

I didnt have this one in the logbook of Aussie 6.9s and might add it to the 6.9 sale posting with credit! thanks for bringing up as I wouldn't have seen it.  Looks honest.  Interesting it has the round hydro lever, Im not quite sure on the allocation of these.  Also very interesting is one service was done here in WA at the now defunct Melville motors!  I would like to know history but not really available.

thanks again
Nathan, wa
#8
Shop / 6.9 for sale (auction) in Canb...
Last post by Skaluke - Yesterday at 06:48 AM
Hi all,

my name is Michael and I am a proud owner of a 79 280SEL since last year, which runs and drives. I got a lot of help reading through the forum while working through things (waterproofing, fuel system etc.), amazing resource and thanks all :)   
There is a 6.9 for sale in Canberra which I thought I share as it is on a more regional auction page and kind of hard to find. I had a very brief look at the car (same colour scheme as mine) which is seems very good condition at a first glance. Very good interior (apart from some minor dashboard cracks), started nicely as well. Anyway, here it is:
6.9 silver/blue


Cheers
Skaluke

#9
Mechanicals / Re: Mercedes 6.9: Suspension s...
Last post by goldacre - 25 November 2022, 05:42 PM
Hi rumb, not at that stage yet  :'(

I will be looking at the levelling valve as it's caked in grime so suspect it has a leak/weep and discovered that "Mercedessource" bloke seems to supply a kit and instructions for that.

Was thinking of investing in your kit as a future 'just in case' insurance. But good to know part number is different and wonder if its just a stronger casing given its a spring- less strut?  ???

Thanks for link raueda1 :)

G
#10
Mechanicals / Re: Mercedes 6.9: Suspension s...
Last post by raueda1 - 25 November 2022, 11:47 AM
If you want to do it yourself then this may be of interest:

strut rebuild

I used Robert's kit and had other parts refurbished by tcj.  It wasn't cheap but cheaper than buying rebuilt units with the advantage of knowing the condition of inner components.  Now the car never sags, ever, even after months and holds system pressure perfectly.  The red pressure light only even comes on if car has sat for a month or 2.  Good luck and cheers,