injector over-torque - Page 2 - PeachParts Mercedes-Benz Forum

carneades · #16 11-11-2019, 03:21 PM

Quote:

Originally Posted by Diesel911

My thought was to check the threads on the Injector and the Pre-chamber Retaining Ring which the Injector threads into. And of course to see if it cracked the Injector Nozzle Nut.

If you look at that attached picture where someone used and alternative measure to remover the pre-chamber rings (a Chisel?) you can see that the pre-chamber rigs are soft.
Since the rings are soft that is where one would expected damage threads if the Injector was over torqued. So that is a good place to look for evidence of the threads being distorted/pulled.

Will do.

I think it was common for Mercedes to make the threads of one part softer than the other, so that the cheaper, less-mission-critical, or easier-to-replace part would strip first.

carneades · #17 11-13-2019, 03:00 PM

Interesting update: I contacted the author of the manual that contained the typo leading to this mistake. He claimed that 75 foot-pounds was insufficient over-torque to worry about damage, and that only at 100 foot-pounds or more would that become a worry.