Quote:
Originally Posted by Frank A
The saga continues, remainder of fod not removed by POS mechanic killed the motor. Somehow ball bearings made there way into the drivers side valve trane and dealt the final blow. I'm going to pull that boat anchor durring spring break and doccument damage. I am especialy looking forward to inspecting the IMS bearing installed by said POS mechanic. If it is not an LN product my buddy is going to lawyer up and crush the balls of this establishment. I would have done this long ago, I was present when the service manager explained the work that they needed to do and so far they are full of guano.
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Classic. One of the things that I preach so hard in my classes is FOD after bearing failure and how it destroys the chances of resurrection after a bearing failure occurs.
The LN bearings have zero tolerance for foreign object debris remaining in the oil after a bearing failure. They will fail in very, very short order just like any bearing subjected to chunks of debris in the oil.
Now that the bearing retrofits are so wide spread we are starting to see improperly installed bearings have issues. Here is a photo album and description of how we checked behind another shop's work to find that the center stud had been over torqued and then how we proceeded to extract the retrofit bearing to find that the preload increase had accelerated wear.
https://www.facebook.com/media/set/?set=a.589408611086938.146669.184464434914693&type=1
This one only had 3500 miles on it and was installed by a former poster here on these forums who was an "instant expert" after his first retrofit. After seeing this I now assume that EVERY retrofit he carried out was incorrect.
Here is a sample... Had we "assumed" that the bearing had been retrofitted correctly this bearing would have failed and the bearing would have gotten the finger pointed at it. I videoed the break away torque process to quantify that the torque was too great.