My somewhat damaged cylinder head

[pastures16]

i thought you should never retighten plugs

[UrS4boy]

i thought you should never retighten plugs

Never back off and then retighten. Just tighten. Clockwise (duh).

30 Nm (22 lb ft).

Better check your plugs.

Now.

[pastures16]

what i was trying to say was that you should never retighten plugs you should use new ones

[GT500]

I agree with the yank,
Torque plugs!
I often find loose plugs or cars I haven't had in before, every time the crush washer has not been crushed!
Never had a plug come loose.
I can just see it now,, sat at Spa " sorry sir, you didn't finish the race because I torqued your plugs in and they fell out!"

Just look at how much thread actually threads into the head, loads, you would have to be ham fisted tossa strip the thread.
If you haven't been trained how to do it, don't bother.

[newsh]

Worth replacing the one way valve in the PCV system, maybe the crankcase has been getting boost pressure. Chances are though that the gaskets have gone hard and just started leaking.

[HenryG40]

Here are the bad pictures:

[Greg_S]

I had the same problem last year and had to have the thread repaired in the head, replace coil pack and lead. Just double check the plugs are tight a week or two after fitting