Treibstoff im Motoröl - 1968 DAF DT 615 M mit Bosch ESP

[brianaxel]

Guten tag,

I hope it is OK to write in English?
I can try in German if you would like

Engine: DAF DT 615 M
Year: 1968 (yeah, 50 jahre geburtstag!)
Fuel pump: Bosch
421*49751
PE6A 90D320 RS2384 (maybe 86, hard to tell)
0400 676 109

Engine oil is being filled with diesel oil, approx. 8L after 2½-3 hours with only light load.
1 injector is maybe clogged. When loosening the high pressure feed pipes 1 by 1, the engine doesn't "change sound" with 1 of the injectors. With the rest the engine rumbles more.
Oil is being delivered to the injector, we see oil leaking out when loosening the feed pipe.

No diesel is seen leaking under the valve cover.

Hoping for some expert here to tell me, if this makes some kind of sense?
Our best guess is that, if the injector is in fact clogged, the approx. 200bar fuel pressure will be forced into the engine oil?
Maybe an internal gasket is blown?

Any ideas are welcome

Thanks for you help and understanding

[brianaxel]

Update:
Injector was not clogged :-/
Had it out and in test bench, worked fine.
Guess it is the ESP, hoping it's not the piston/piston ring burned/broken letting the fuel directly down in the oil sump.