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silverstar84
06-21-2010, 10:19 PM
2007, 906.635/642.993
Code: 2952-001,
B90/2 (Left EKAS end position measurement sensor)
The valve is closed. Readout too large

Inlet port shutoff positioner-M72 connects the Left and Right EKAS rods.
In trying to determine why, during actuations, my left EKAS sensor reads OK one way, NOT OK the other.
I have found the linkage from the M72 to the left intake lever or swirl flap guide,
is connected with a bright metal 2 piece linkage which appears to be spring loaded.
This is only on the left side, the right does not.
Iím thinking this is an adjustment I found it to be loose.
However I donít know if it is loose for the spring tension or is it supposes to be tight.
Iím hoping it should be tight and maybe this is the reason for my bad reading on the EKAS sensor.
Unless I had a motor apart there does not seem to be anyway to provide pictures of this beast.
Can someone shine some light for me?
Please.
Michael

jdcaples
06-22-2010, 12:56 AM
Michael,

What you're doing is a first for Sprinter-Source, detailing the resurrection of an OM642.993.

Your patient would surely have been recycled and this learning opportunity lost.

I wish I could help you more. All I can ask is that you post pictures of the things - that you can see, like the linkage - you're talking about; maybe that will inspire discussion and through conversations, maybe the community can help you a bit more.

I am very grateful to you for the time and your sharing these surgical experiences.

-Jon

sprintguy
06-22-2010, 01:48 AM
Do you have an SDS? If so go into the CDI controller and I believe actuations and actuate EKAS , watch the physical linkage , You need to know if the linkage is actualy moving when the actuator moves. And is it moving far enough . Remember that the linkage is made from plastic and is very easy to damage , especially during assembly. If my memory serves correct I do believe that the screw is supposed to be tight. (I think your on to it :thumbup: )


Carl

silverstar84
06-22-2010, 12:44 PM
Yes I have SDS.
My goal this AM is to see if I can activate the M72 while I have at least 6 different electrical connectors disconnected required to move all the stuff out of the way so I can see the effects of the test.
It would make since the spring loaded clip would be an adjustment. Thus it should be tight.
The spring loaded part throws me because it could be argued to be a buffer of some sort.
I plan or hope to talk myself out of that.
I will keep you posted.

SprinterHelp
09-17-2016, 11:45 PM
2007, 906.635/642.993
Code: 2952-001,
B90/2 (Left EKAS end position measurement sensor)
The valve is closed. Readout too large

Inlet port shutoff positioner-M72 connects the Left and Right EKAS rods.
In trying to determine why, during actuations, my left EKAS sensor reads OK one way, NOT OK the other.
I have found the linkage from the M72 to the left intake lever or swirl flap guide,
is connected with a bright metal 2 piece linkage which appears to be spring loaded.
This is only on the left side, the right does not.
Iím thinking this is an adjustment I found it to be loose.
However I donít know if it is loose for the spring tension or is it supposes to be tight.
Iím hoping it should be tight and maybe this is the reason for my bad reading on the EKAS sensor.
Unless I had a motor apart there does not seem to be anyway to provide pictures of this beast.
Can someone shine some light for me?
Please.
Michael

I found this spring arm gizmo to be tightly screwed and full extended on two vehicles one with 39k anf another 150k. Need to check mine for the record.

lindenengineering
09-18-2016, 04:23 AM
Yes I have SDS.
My goal this AM is to see if I can activate the M72 while I have at least 6 different electrical connectors disconnected required to move all the stuff out of the way so I can see the effects of the test.
It would make since the spring loaded clip would be an adjustment. Thus it should be tight.
The spring loaded part throws me because it could be argued to be a buffer of some sort.
I plan or hope to talk myself out of that.
I will keep you posted.

With a scanner you can read the movement by forced operation.
In any case with a flash light you can see the movement of the linkage when operated by an assistant with the scanner .
Also bear in mind that by about 175 K miles there might be sufficient wear and heat attack in the plastic linkage that the system is running wild dictating a replacement anyway!
In most cases I see the system linkage is about done for by 250,000 miles!
If of course the engine as a whole hasn't gone tits up for some other reason dictating a tear down of sorts.
Dennis
Mechanic

Dodgemup
11-19-2017, 11:40 AM
yo dennis the tits up comment .... your killing me bro thats has got to be 1 of the funniest i ve ever heard :thumbup:

lindenengineering
11-19-2017, 04:14 PM
Well glad you like the comment.:laughing::thumbup:
Seriously though its carbon that is the killer on these engines and heat generated by regeneration.
I have a 3500 Sprinter box truck I have just sold to a moving company.
Exhibiting this EKAS measuring fault it got progressively worse as we used it for parts runs etc.

So it was due a teardown removing the manifolds and cooler. (for a re-seal)
Yes and Yes upon teardown the driver's side link was worn especially at the back which obviously denotes heat attack judging buy the edges of the pivot having melted!

Now sometimes you can clear this fault if it's not linkage related worn by doing a BG upper cylinder purge . Then sometimes it is unsuccessful.:thinking:

So setting out to maybe get some answers we did the purge out prior to teardown.
Results were shall we say interesting!

The EGR cooler was cleaned fairly well but was patchy in places--how much it was plugged up before we had a go at it is anyone's guess! Inconclusive this !

The EGR valve was cleaned very well! Wow nice job!

So was the transfer port tube and the inlet distribution horn. Yes cleaned !

The unit must have had some sort of leak at the O ring where the horn meets the inlet manifold of the passenger's side manifold because we left the rig "as is" post test for about a month before tear down.

The carbon dwelling in that inlet tract turned to a thin liquid like tarry fluid before dripping out through the defective O ring seal filling the engine valley with a carbon liquid morass.
Upon removal the inlet horn was almost cleared out with a few thin patches of carbon in place. Very good!
The passenger's side inlet manifold and porting was cleaned, a few patches and stains but cleaned.
Now the drivers side--wasn't cleaned--OK the carbon was like a paste in the manifold and ports and though heavily carbon coated it could be scraped off--but wasn't cleaned as expected !
The air flow might have caused some stripping in subsequent service but wasn't as conclusive as hoped!

I took the observations up with BG but as yet they don't or won't comment !
The manifolds are saved for examination being worn beyond further use!

Now part of this purge out is to run the engine on a carbon stripper in the engine oil for 30 minutes at a high idle for 1500r/m.
Having put fresh Rotella T6 in it (for test purposes plus a new filter) the test was conducted as prescribed but we left the engine "as is" for about a month without running it!
Now this BG purge additive is high in phosphorus which strips out carbon!

AND strip it out-- it did!
Dropping the oil was a sludge of liquid carbon and what is lying on the sump floor like the rig has never had an oil change in its 250,000 mile recorded life!
Its going of for test analysis.
The oil filter was choked! How much by who knows -its needs a test!
Remember this rig had a regular service schedules done to it by Fed Ex the previous owners and was disposed of!

So it will come as no surprise that carbon is the killer of this engine and why it will go tits up at 250,000 miles if you don't take care of it!
Dennis