Hello all, I am trying to remove one of the heads of my 2.8 v30 because I have compression problems and want to check out the valves, however I am stuck when I need to remove 8 bolts attaching the head to the piston block, those bolts look like torx bolts but I am not sure, I am attaching pictures so you can take a look at what I am talking about, can any of you confirm they are in fact torx or any other kind of bolt? Thank you very much.


As you can see on the last picture they look like torx bolts but they look a little different to me, I am not sure. Any help is greatly appreciated.

 

So after some research apparently those are not torx bolts, they are Polydrive bolts, I tried too look what size would fit my car but I don't I wasn't able to find that information, as far as I can see there is 10 or 12 mm bits but I am not sure which one would be the correct one, any ideas about the size?

 

What is the engine code, model year, gear? I'll check...

 

They are Polydrive...
You'll have to replace the bolts, as are torque-to-yield application.
You can buy the bolts and the tool h e r e

 

Thank you very much for your help, now do I need to have the shop rebuild both heads? I mean do they need to be done in pairs or can I just have the do the one I am having problems with?

 

Heads can be done individually.

Of course, there is the argument that, as long as you are this far into the engine, you might as well do it all. But this quickly leads to new rings and rod bearings as well. But, as long as you're that far into the engine.....

Bob