Stripped Exhaust Manifold Bolt

[magelin]

When under my car I saw one of the exhaust manifold bolts half way out. After using my ratchet to put it back in it became evident that some idiot over torqued the bolt and now it is stripped. I removed the bolt and it appears to be fine so unfortunately the threads are probably gone on the block. I looked up the bolt (Part number 900 378 227 09) and it is a Hex Head M8 x 28. I was wondering how long the threads are in the block and can I simply buy an M8 x 32 (or other length M8 x 35?) and just use that. All the other 8 bolts are nice and tight.

Also what is the difference between 90037822709 and 99907507100, they both appear to be Hex bolts M8x28, the only difference I see being the first one is $6 and is designated for the turbo and the second being $2 and being designated for the non turbo. Is this just a turbo tax or is there a difference?

Edited January 31, 2013 by magelin

[jpflip]

ant_8u had a lot of problems with these bolts. He's very good at wrenching and very friendly. May be you should ask him here: http://www.6speedonline.com/forums/996-turbo-gt2/259577-exhaust-nuts-totally-corroded.html

Edited January 31, 2013 by jpflip

[JFP in PA]

When under my car I saw one of the exhaust manifold bolts half way out. After using my ratchet to put it back in it became evident that some idiot over torqued the bolt and now it is stripped. I removed the bolt and it appears to be fine so unfortunately the threads are probably gone on the block. I looked up the bolt (Part number 900 378 227 09) and it is a Hex Head M8 x 28. I was wondering how long the threads are in the block and can I simply buy an M8 x 32 (or other length M8 x 35?) and just use that. All the other 8 bolts are nice and tight.

Also what is the difference between 90037822709 and 99907507100, they both appear to be Hex bolts M8x28, the only difference I see being the first one is $6 and is designated for the turbo and the second being $2 and being designated for the non turbo. Is this just a turbo tax or is there a difference?

As just about everything else is different about the Metzger designed Tubo engine, I am not surprised these bolts are as well. There is realtively few parts that cross over between the the turbo and the M96/97 engines.

You should also consider the possiblity of using a thread insert (HeliCoil and Time-Sert both come to mind) to repair the head in place.

[logray]

+1 on the helicoil... then it will last forever no matter how many times you remove it.