air leak

[andrew......]

hi guys an girls.... so i have a rb25det non neo that is leaking air like a sift from number 5 cyl/chamber. its coming from inside the head behind like the cams an sprigs at first thought it was leaking out a valve so checked that they were closing properly an they seam allgood double checked the valves were not opened by the cams or anything silly . so could there be a crack anywhere in that chamber that is not visable to the eye but big enough to leak alot of air

[GTSBoy]

Sounds like it's f**ked. It's going to have to come off, so you might as well go do it now while the sun's out.

[andrew......]

has anyone else had some thing like this happen. there is no visual damage. but for the amount of air escaping you would defenitly think there would be a big hole somwhere. the only way it could be coming out where it is is if the valve was open an the air would pass by the stem seal which i wouldnt it would go rite out the port that was open... so valves are 100%closed. ill have to just get it looked at down at the shop. will let yous no how it goes

 

[R32RB20]

If you 100% know there is air coming out of the cam cover or crankcase then yeah it could be a hairline crack anywhere on the top end. if you cant afford to replace the whole thing you could add smoke to your intake to trace the leak then just replace the part that's leaking. you never know if could just be a valve? just make sure you clean it up properly afterwards