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motorworx12
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Thanks for the replies everyone as it has been most helpful. Im going to try to take the head off with the engine still in the car. if i get stuck then ill take it out. My scope can take pictures ill try to get one loaded up. ill take some pics to keep everyone posted on whats happening. I have used engines before where the valaves hit the piston. Although if the piston is cracked thats a whole other story. thanks again.
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Hey everyone im new to the boards im always on hear reading stuff and theirs so much help on hear i love it! anyways ive got a cayenne s 4.5 non turbo. Ive had trouble starting the car and running really rough after letting my cousin drive it and it comes back misfireing! Found codes for misfires cylinder 1 and 5. after cross swapping coils problem still there. So i decided to check compression and cylinder 5 was dead! i had between 180-200 psi on all cylinders except 5. so i bought a boroscope to see if i could see any damage on top of the piston. I found a nice big indent from the valve on the intake side!!! what could have caused this? Anyways ive been looking at repair instructions on all data and it says to remove the engine for taking out the timing chain cover? does this sound right to you guys? ive built many bmw engines so im not mechanically a tardo, just wondering if its necessary to remove the motor for pulling the head off. any help/ input would be greatly appreciated! thanks