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Eric, Automotive Repair Shop Manager
Category: Volvo
Satisfied Customers: 29713
Experience:  20+ yrs. experience as repair shop manager and technician.
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I stripped a cylinder head bolt (#9) while removing the head..gasket

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I stripped a cylinder head bolt (#9) while removing the head to replace the gasket. It is fully torqued on. The 14mm socket does not grab it at all. What is the best way to attempt removing the bolt? I can drill it out an dtap in an extractor but annot imagine that I will be able to get enough force to losen the bolt. ANY suggestions are appreciated!



There are special sockets that have spiral cut edges designed for gripping rounded bolt heads in order to loosen them with a ratchet. You need to take one of the other cylinder bolt heads in to a NAPA, Carquest, Bumper2Bumper, or other major parts store to match up the correct special socket. Once you get the correct one, you simply hammer it on, insert an extension and use your ratchet to loosen it like any other bolt.


Here is a sample of one the sockets:




They are good for about 8 uses, then the spiral cuts are worn out. The above one is a brand I have used before - IRWIN and are widely availabe- even some hardware stores carry them

Customer: replied 7 years ago.

Is it safe to remove the other cylinder head bolts EXCEPT for the one with the stipped head? I thought the bolts had to be losened in the diagonal pattern to keep the head from warping.



You will be ok to remove one of the center bolts to take in- leave the rest as they are until you get the rounded one broken loose. If you havent yet, I would also pick up a can of PB Blaster(1000x better than wd40) and soak the heck out of the bolts and allow time for the PB Blaster to soak down into the head and the threads- this will help in breaking them loose

Eric and other Volvo Specialists are ready to help you
Customer: replied 7 years ago.

Thanks Eric!!


I'll contact you again if I need more help. You really got me moving forward again.


sounds good- have a great evening, and if you need anything else let me know...

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