Pictorial on installing the Bosio injector nozzles - PeachParts Mercedes-Benz Forum

Meles · #13 09-29-2008, 09:43 PM

Quote:

Originally Posted by gsxr

Yep, as HMX said, these engine have double-row timing chains, and require manual injection timing adjustments. As the chain wears, the injection timing will gradually retard (not a huge amount, but it will drift a couple degrees over the years). It's not that hard to check chain stretch, or adjust timing, but the proper tools do make it easier.

The valves are non-adjustable since the hydraulic lifters (cam followers) automatically compensate for clearance. Sometimes they get noisy and if synthetic oil doesn't cure it within maybe 5kmi, new lifters will usually do the trick... assuming there is no debris in the head oil galley restricting oil flow to the lifters! (Don't ask how I know that.)

EDS = Electronic Diesel System, which I believe is the name of the main computer control for idle speed, emissions (EGR / ARV), and on some engines also the boost pressure. ELR is sort of a sub-system, part of the overall EDS. (On some cars, there may be ELR only without EDS, but this may not apply to USA models with EGR). ELR = Electronic Idle Speed Control (I'm sure it stands for something interesting in German). The ELR actuator is the red round thingy on the back of the IP.

Its TNT cocktail time after reading that EDS particularly on w140 (actually it was the delivery service for my front bumper that killed me as they had me making some extra trips home from work). Some 130 proof Montmartre absinthe watered down with canadian club (shaken).
My mechanic said years ago they were self adjusting valves when I paid to have them adjusted. He also replaced my timing chain at 175k miles and stated he did not adjust the timing since he did not think it had been adjusted as the chain stretched. He kept the original timing. I'm now 85k miles later so might be starting to stretch a little. For wvo/bio this guy says:
See Dr. Evil below.....
"adds just 2 degrees to the 'std' setting which is just about right for BioDiesel" (volkswagon)

I believe you advance the timing to compensate for timing chain stretch, so that's two reasons to advance the timing. I'm a neophyte with a TNT cocktail as my special tool, so don't try this on my own? I see this on my pump:
see attachement below...
Might I adjust that ever so slightly?

On to Idle adjustment (surely I can try this?):
BenzDiesel on this sight:
“The idle adjustment screw is on the injectionpump near the electronic idle control (the big red thing on the back of the injectionpump). You must loosen the half inch nut securing the adjustment screw. I think it takes a 5 or 6 millimeter socket or wrench to turn the adjustment screw. I have used vise grips. Backing out INCREASES rpm. 700 rpm works well for me, providing a smooth, gas like idle. …… for any 603 or 617 I have owned, the ELECTRONIC and SENSOR systems have to be 100% operational for the idle control to be taken over automatically and I've been lucky enough to have been in the presence of ONLY one car where that happens…”

I think I should try adjusting and see what happens. A little higher might do the trick (though gsxr you seem to be subconsiously hinting I need to replace the ELR.) Problem is I have a little red thing that does not have a half inch nut. Its just red plastic surrounded by a round metal jacket/ring. Do I remove the red plastic cap to reveal and adjustment screw? I tried turning the whole thing, but would not budge.

Thanks to all. This is a great merc diesel group. I post on mbworld and they just tell me my engine is going to blow up and not much else. You guys do the same, but add much else. Kudos! w140 diesel is a rarer bird and no mechanics in the area have true experience so I am always expecting disappointment. Eager to do as much as I can myself just because I know that it was done right. (or if not I only have myself to blame which is much better than thinking negative things about one's mechanic, negative is unhealthy.)

Another TNT I think....