[bavArian]

Hello everyone,


on Monday I started to remove the cylinder head because I still had problems with an overheating engine under >50% load along with foaming coolant. Retorquing the head didn't change anything, so I suspected a damaged head gasket.
Upon removal I found that the head gasket seemed fine. I couldn't find any cracks in the block either, though I still need to check the intake and exhaust ports tomorrow.
I did, however, find 2 small cracks in the cylinder head, between #2 and #3, shown in the picture below. The seemingly excessive rust in the combustion chambers is from a combination of the lighting when taking the picture as well as having cleaned the combustion chambers and having used sulfamic acid to clean the water passages from as much rust and scale as possible followed by flushing the head with water. The rust-ish color on the mating surface seems to be copper residue, either from copper spray or the old copper head gasket.


My question is do the cracks cause problems or can I use this head?
I did not notice any coolant loss around the head stud, the stud isn't heavily corroded either. From my understanding these two cracks shouldn't cause any problems, but I still like to check with people who have more experience in this field as this is the first cylinder head I've removed.


I'll use a copper head gasket (Snyders A-6051-C), should I use copper spray or another sealant or install the gasket dry? How about a thin layer of Hylomar M on both sides of the gasket?



Have a nice day,


Daniel