Replaced with new or used?

I am seriously confused by injectors doing this.
Perhaps I am mistaken, but the fuel in crankcase accumulation I would need current exact miles and volume of excess to calculate possible sources.

I can think of several critical injection pump failures that potentially could do this, but the few times I have experienced them there where extreme performance issues.


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As I go through the fuel system in my head, from top to bottom, the only places fuel can mix with oil are:

1. Lift pump
2. Forcing past well worn pump elements.
3. Forcing past delivery valves that are loose/missing the copper crush washers. (Long shot to impossible)
3. Leak at injector/return lines fills up the injector wells, contact with fuel rots O rings at the top of the wells and fuel migrates into valve cover. (Easy to spot with plastic cover off)

Another thought: Could a failure somewhere in the injection pump allow fuel into the vacuum system and the VP discharges it into the crankcase? This should be easy to isolate by removing all vacuum lines from the IP.

Correct me if I'm wrong.

__________________
-Evan


Benz Fleet:
1968 UNIMOG 404.114
1998 E300
2008 E63


Non-Benz Fleet:
1992 Aerostar
1993 MR2
2000 F250

If I recall this injection pump structure correctly ?

item #2. I would expect serious performance issues.
item #3. I would expect serious performance issues.
item #4. I would expect serious performance issues.

As I recall those leaks would cause: Lack of power, shaking, smoking and/or Nailing.

I begin to wonder if the injection pump is wrecked from a bad batch of bio-diesel = water in the delivery valves would also ruin the injectors...


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If it is at all possible for leaking return lines to fill up the crankcase, then it was probably happening here. The problem I'm having with that is the pressure in the valve cover. Seems it would be forcing it out instead of sucking it in.

Either way, in a few days the injectors will be back on and the return lines replaced, and I pray to Jeebus that it's fixed.

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How is there pressure in the valve cover? I don't remember reading that anywhere. I would think that would indicate that the vent system is plugged. Unrelated to the fuel contamination problem but still worth looking into.

One other step I would try if the injectors don't solve it is to run the engine with the side cover off the injection pump. Under normal conditions, very little oil comes out there. If you observe a fuel/oil mix flooding out then something is seriously wrong with the top end of the pump.

__________________
-Evan


Benz Fleet:
1968 UNIMOG 404.114
1998 E300
2008 E63


Non-Benz Fleet:
1992 Aerostar
1993 MR2
2000 F250

And there you have it. Car is fixed, been driven 50+ miles with no change in oil level. What a relief!

It's late and I'm going to bed, but I will post a more detailed explanation tomorrow.

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