wrench size cyl head bolt ?

[paulclassa]

its not allen or tork, blown head gasket job, shop wants $900 dont have enuf $ so im diy

[joatmon]

According to the attached PDF, step 45 says "Using a 10mm bi-hexagon wrench". I hadn't run into the term "bi-hexagon" before, but I assume it refers to a 12 point bolt. I am not sure you can get a "wrench" in there. A lot of socket sets only have 6 points for the small ones. The chain auto parts store may carry a 10mm 12 point socket, either individually or as part of a set.Some stores now carry "universal" tools that are supposed to work on 6pt, 2pt, allen, torx, etc., bt I have not tried those.At least I think that is what you are asking about. Can you post a picture showing the bolt head?

Attached files x040001.pdf (554.7 KB)