How can I fix this hole in the cylinder head?
 

1992 940 Estate 2.0GL B200

I removed the front end of the engine to replace the front seals as there was a bad leak coming from the camshaft seal... Once I popped out the old seal I noticed a hole in the cylinder behind the seal which is obviously where the oil leak is coming from...

Is there any easier fix or will I have to replace the whole cylinder head?

Please follow the link below to the picture, the hole is at 5 o'clock. Thanks in advance for anyone who can help!

https://pasteboard.co/IgH8z3i.jpg

Are you sure it's not the oil feed to the front cam journal that gets sealed by the oil seal? It looks like it's meant to be there to me.

Actually, it's the drain from the cam back to the crankcase. If you plug it up, don't be surprised if the trapped oil pops the cam seal out about 12 seconds after starting. :shocked:

Thank you for your replies... there was a terrible oil leak coming from that seal, coating the whole block in oil and getting inside the timing belt, so I dont think that hole is meant to be there, if you look closesly you can see the edges of the hole are jaged/uneven, It looks like whoever took the seal out last jammed their screwdriver in there a bit too hard...possibly?

I dont think a new seal would be able to hold it back... I'm going to take the top cover off today and see if I can find out a bit more from looking at the cam. Any more suggestions? Thank you!

Fit a new seal and monitor it. Correctly fitted seals can withstand a lot more pressure than the oil pump in the engine is ever likely to give.
Assuming it is a drain hole for the excess oil to drain away from the cam journal, it doesn't have to be pretty, just functional.

Before you fit the new seal, straighten out a paper-clip and use it to probe the drain hole to ensure it isn't blocked. Also give your PCV system a thorough clean - that includes the oil separator, flame trap, manifold stubs and any blocked hoses. You'll need to do it again in a month or so but do an oil & filter change when you do the first clean out. Substitute 1L of engine oil for 1L of Carlube ATF-U to clean the internals of your engine and revive other oil seals.

Try watching this.

+ YouTube Video

If you skip to 5:33 you’ll see exactly the same hole on a pristine engine.

It is supposed to be there


There question gets asked every year or so

Yep mine has this.

Check the cam surface for a track and avoid it when you install the seal.

Also make sure you are getting vacuum in the PCV