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warm up compensator for M110 engine
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Posted 10/13/2009 8:21 PM
elevatorbernie
Expert




Date registered: Aug 2006
Location: Vancouver B.C. Canada
Vehicle(s): 1989 280GE
Posts: 1346
1000
Re: warm up compensator for M110 engine

Welcome to the forum, your G may have a different problem. I suggest starting a new topic.
#158618 - in reply to #158603
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Author
Posted 10/14/2009 3:56 AM
macfun
Member


Date registered: Oct 2009
Location: Belgium
Vehicle(s): 1987 280GE
Posts: 18

Re: warm up compensator for M110 engine

elevatorbernie - 10/14/2009 2:21 AM

Welcome to the forum, your G may have a different problem. I suggest starting a new topic.

Well, don't hink so, I had a known-good WUR installed for some days and the 280GE ran then smoothly after cold start.

This topic is very interesting and full of information.
I think I could add mine.
I'll do it later this week, I made lot of pictures, tests and researches before discovering this forum !!!!
#158633 - in reply to #158618
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Posted 10/14/2009 4:42 AM
macfun
Member


Date registered: Oct 2009
Location: Belgium
Vehicle(s): 1987 280GE
Posts: 18

RE: warm up compensator for M110 engine

I found this picture from a french M110 manual.
It shows the WUR like mine (438 140 103).
There is a second membrane ("step" shape in red) to separate top chamber and middle chamber.
Top side outlet (noted "c") is linked to atmospheric pressure.
Side outlet (noted "a", bottom of WUR) is linked to vacuum of intake manifold.
WOT greatly weakens the vacuum at "a".
This lack of vacuum makes the membrane go down, reducing inner spring load on fuel pressure regulator.
It lowers command pressure and makes mixture enrichment.
In red, the second membrane.
In green, the hole in the screw to balance pressure in top and bottom chambers.

Edited by macfun 10/14/2009 4:55 AM




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#158635 - in reply to #84730
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Posted 10/15/2009 12:07 AM
elevatorbernie
Expert




Date registered: Aug 2006
Location: Vancouver B.C. Canada
Vehicle(s): 1989 280GE
Posts: 1346
1000
Re: warm up compensator for M110 engine

macfun - 10/14/2009 12:56 AM

elevatorbernie - 10/14/2009 2:21 AM

Welcome to the forum, your G may have a different problem. I suggest starting a new topic.

Well, don't hink so, I had a known-good WUR installed for some days and the 280GE ran then smoothly after cold start.

This topic is very interesting and full of information.
I think I could add mine.
I'll do it later this week, I made lot of pictures, tests and researches before discovering this forum !!!!
When you inquired about addding to the post, you had not explained your troubleshooting process and I thought you were looking for advice on a problem that could be caused by several things. I didn't guess you had already have solved the problem...sorry my misunderstanding.... good work, please add to the post and tell which part of your WUR was faulty to cause the rough running after warm-up. Info is always welcomed here. Bernie

Edited by elevatorbernie 10/15/2009 12:13 AM
#158674 - in reply to #158633
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Posted 9/12/2012 7:15 AM
G WAGON
New user


Date registered: Dec 2011
Location:
Vehicle(s):
Posts: 1

Re: warm up compensator for M110 engine

Hi All…

Thanks for this thread; although it is an old one, it has…

a) Made me laugh.
b) Enlightened me on the working of a WUR.
c) Sorted my issues.

I have a little to offer back in way of a thank you (I work in the MB network).

Jules I think has hit the issue head on….

There are various part numbers and versions of the Bosch WUR that MB use on the M110 280 engines over the years and different model applications. While I can’t offer any technical back ground as to why there need to be different versions like some of you have, I can offer some parts background.

Bosch part number 0 438 140 057
MB part number A110 070 02 62 £785.00 GBP + VAT MB Germany have 11 and are FINAL STOCKS.
Fitted up to engine serial number 110.994.10/50,20/60.004203 (LHD RHD Manual Trans)
110.994.12/52,22/62.001498 (LHD RHD Auto Trans)
This has the WUR to Inlet Manifold pipe feeding from the connection on the front of the unit near the
fuel pipes.
The pipe from the WUR to the Fuel Damper comes out from the connection on the side.

Also available…

Bosch part number 0 438 140 103
MB part number A110 070 00 62 £387.00 GBP + VAT MB Germany have 884 and are FINAL STOCKS.
Fitted from serial number 110.994.10/50,20/60.004204 (LHD RHD Manual Trans)
110.994.12/52,22/62.001499 (LHD RHD Auto Trans)
This has the WUR to Inlet Manifold pipe feeding from the connection on the side of the unit.
The pipe from the WUR to the Fuel Damper comes out from the connection on the front of the unit near the fuel pipes.

This can be seen on EPC, but in true MB fashion they are not shown on one picture, but on a series of pictures with part of the system on each as you have all found! With the chassis number in EPC and Data Card present and all filters on, you can sort out which pipes fit your chassis number by looking at the footnotes and engine serial number breaks. But it is not easy!!! If anybody wants to confirm their pipe set up and what their vehicle left the factory with i.e. WUR part number and pipe layout then PM me your chassis number and I will come back to you within a day or so.

One last thought that maybe somebody can confirm? If you have the wrong type WUR fitted, either through a previous owner / garage or you have a second hand WUR available that is the wrong type, then is it simply a matter of understanding which type you have and piping it up as per above? Is there anything else on the different version that would make a difference to the basic running?

There are also some early versions of the MB part numbers that you may have fitted to your vehicles from either factory W460’s or another vehicle i.e. W123, T123, C123, R107, C107, W114, C114, W116, W126 etc. They are as follows:-

A000 070 03 62 Bosch number 0 438 140 010 MB S/S to A000 070 16 62 (Not normally fitted to “G”)
A000 070 16 62 Bosch number 0 438 140 057 MB S/S to A110 070 02 62 (Basically same unit)
A000 070 29 62 Bosch number 0 438 140 103 MB S/S to A110 070 00 62 (Basically same unit)

Hope this helps and thanks again for the help of the thread.

Thanks Gav
#207223 - in reply to #84730
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Posted 9/12/2012 6:01 PM
hipine



Date registered: Jul 2006
Location: US, CO, Bailey
Vehicle(s): 460 1980 280GE w. 617A
5000
Re: warm up compensator for M110 engine

G WAGON - 9/12/2012 5:15 AM

Hi All…

Thanks for this thread; although it is an old one, it has…

a) Made me laugh.
b) Enlightened me on the working of a WUR.
c) Sorted my issues.

...One last thought that maybe somebody can confirm? If you have the wrong type WUR fitted,...is it simply a matter of understanding which type you have and piping it up as per above? Is there anything else on the different version that would make a difference to the basic running?...


Very cool and thanks for all the great info! At the end of the day, the WUR is nothing but a variable pressure regulator designed to apply the correct pressure to the fuel meter damper piston under various circumstances. So if you find one that gives a pressure curve like the one in the manual for your vehicle, and plumb it appropriately, it'll do the job. There are even some articles on the net of people adjusting these things for the pressure curve they want, but I've never tried it.

I've also never seen a list of pressure curves by part niumber, so finiding ones that are a legit replacement for the G unit might be tough in that regard. But if one got a chance to grab a WUR from a breakers or off e-bay or something for cheap, it would be worth testing it I think. Especailly if it came from a motor of similar displacement and fuel system design. One thing to be careful of is getting a WUR from a KE or K Lambda-jet motor. These will be designed to run leaner with the "finishing touches" of fuel added by the PWM controlled extra injector hooked to the O2 sensor and might not give enough fuel to a straight K-jet motor like early Gs have.

Good luck!

-Dave G.
#207235 - in reply to #207223
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