Cam Bolts Broken After Replacement

[Sid_E46]

It’s not about stronger bolts, but it needs to prevent them from backing out by using Loctite

Red Loctite was used, and it was torqued properly according to my knowledge. Can even slight over-torque cause this?

[sapote]

I'm interested of seeing the cam sleeve 6 holes, and how bad they had been distorted after hammering on the bolts to cut a notch.

[maupineda]

My same question, if Loctite was not used, or, the assembly was not cleaned so that the Loctite did not bond, that would be the issue.

[Obioban]

Did he use Loctite on the bolts threads

100% this. The issue with those bolts is them getting loose over time. Original bolts, updated bolts, aftermarket bolts, doesn't matter-- the key is installing them correctly (torque spec and loctite).

[sapote]

It’s not about stronger bolts, but it needs to prevent them from backing out by using Loctite

[sapote]

Did he use Loctite on the bolts threads

[Sid_E46]

So my friend's 06 M3 had its cam bolts replaced with the updated torx head BMW bolts which proceeded to snap just like the previous bolts in 12k miles. Is there a possibility that the previously snapped bolts damaged the threads and caused this to occur once again? Has anyone experienced something like this or recommends a different type of bolt?