The first thing I would do is take a sample of the motor oil and send it in for testing. The second thing I would do is pull the injectors and see what condition they are in, I would also pull the glow plugs and check them as well as test them. That should give you the information you need as to the condition of the engine. While you have the GP's out you could do a compression test of the cylinders. The third thing I would check is wether you are getting fuel (both) diesel and WVO. These are all relatively inexpensive checks and relatively easy to perform.

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Gary
OBK #37

Gummed up?...

Link worked for me. Firefox browser.

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1986 Euro 500SEC "RUF" 9:1CR, "Rose"
1985 Euro 500SEC Cabriolet AMG Widebody
1982 Euro 500SEL "Blue"
2001 Texas Heeler (Aussie/Queensland X) "Sulphie",
2012 Queensland Red Heeler "Squeak"
Best dogs I've ever had.

In a properly designed, installed, maintained, and operated system you will not find any of the above posted problems.

The problem you describe, sounds simply to be air somewhere in the fuel system. This can be caused by inadequate sealing of hoses, gaskets, and fittings. This can also present itself on a severly clogged filter, with the greater differential of pressure from suction, allowing micro bubbles of air to "condense" and "produce" larger air bubbles.

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1983 W126 300SD
Frybrid SVO/WVO Three-Valve Conversion
Propane and Water/Meth Injection Coming Soon