My brand new (to me) 240 D has a small oil leak that appears to be coming from a 19mm bolt on the head behind the vacuum pump. The parts diagrams I've been able to look at don't have call-outs for this bolt, because it is generally hidden behind the timing chain path in the 3/4 view of the engine.

The closest thing I could find on the forum was this thread two years ago:
240D Oil Leak from bolt over Vacuum Pump
But there wasn't any resolution.

I can't budge it either way with a breaker bar, and I don't know whether it's a good idea to try more extreme measures.

I'm mainly just curious to know what the purpose of this bolt is.

In the mean time, there is a much more pressing leak from the front of the block. I'll be scouring the rest of the forum for ideas...

If its the "bolt" I think you mean, it is how you access the "intermediate gears" that drive the oil pump. You should be able too remove it and use a crush washer. Would be good if you could circle it in the pic, just too make sure.

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1985 Euro 240D 5 spd 140K
1979 240D 5 spd, 40K on engine rebuild
1994 Dodge/Cummins, 5 spd, 121K
1964 Allice Chalmers D15 tractor
2014 Kubota L3800 tractor
1964 VW bug

"Lifes too short to drive a boring car"

Sorry, I meant to mention it's the bolt with puddle of oil around it!

Thanks for the quick reply.