Mitch
Mine loosened twice on #4. The second time I took the clamp off and noticed that the thin washer dished into the larger hole on the mounting bracket. I used a #10 washer, happened to be from the AN bin at my hdwe. store, thicker stronger looking seems to span the larger hole much better IMHO.
Happy Friday!
I checked mine today. 7 years, 84000 miles, they were all still tight.
-Ryan
The old style clamps use a bolt holding it together. The updated lines use a large " flanged head bolt " with a torx insert. The updated lines are not expensive from Cummins. I changed all six on my engine when I had it out for rebuild. On my 03 # 1 was the only one that didn't change up to a new p/n. Shadrach