Cummins N14 A/C compressor bolts breaking

I’m going to say:

1. Not enough belt tension

2. Compressor bolts too sloppy and not enough torque.

 

Put some lock washers on your bolts

 

How about using a torque wrench when you tighten them? And maybe some Loctite to make sure they don't come Loose.

Also, maybe a flange bolt would be better if you're not using it already.

 

I had the same problem,bought new ac compressor, belts,bolts,ac clutch..My belts would get loose all the time and ac comp kept sliding down,it drove me nuts! I said screw this crap, i bought new sanden style comp and a conversion bracket. Ac works good,no more loose belts no more messing around.

 

I have had this issue once on my BC4 855. I have been including it in my PM's ever since. I will find a pic of what we did....