Oil leak

Iv made a start on taking everything off to service the car and clean everything up that clogged up. I found a oil leak from the top of the engine
I can see were it's been running all over the place the bolt that goes into this hole was done up tight enough.not to tight tho
Is it normal that oil come out oft hole? I only noticed it because I took the covers off and ran the engine for a bit to warm the oil before I drained it.
How would I stop this from leaking when I come to put it all back together?

Ddleeds said:

I can see were it's been running all over the place the bolt that goes into this hole was done up tight enough.not to tight tho

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If the crankcase is pressurized, then oil can leak out.

Ddleeds said:

Is it normal that oil come out oft hole?

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Yes, the bolt should stop the oil leaking. I use a small O ring on the bolt, just to make sure.

Ddleeds said:

How would I stop this from leaking when I come to put it all back together?

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Don't tighten it too much, or the brass insert will spin. It just needs "nipping" up.

Thanks I will use a o ring when I put it all back together