MadBill wrote:If I'm not reading too much into the data, sounds like the roller seized due to flaked debris, causing the bushing to indent at the contact line due to lack of rotation? if so, this could perhaps be classed as a lifter issue but not a bushing failure.cjperformance wrote:...Look at the bushing, you can see a mark that goes from one side to the other, this is on the loaded part of the roller in line with a flattened skid on the outside of the wheel. Measures up at .0005" of a dip in the bush at that point...
Prior to pull apart, the roller wheel 'felt' smooth to turn, most of the time, then suddenly it would grip up then if turned further ir turned backward it would then free up and feel fine again, then occasionally grip up again. See the little flaw in the body im pointing the pick at, when I pulled the wheel out then started inspecting and noticed the flaw I touched it with the pick and a little flake of metal came out of there!
Fwiw all othe lifters were fine.
Definitely not blaming the bushing here, if anything imo was to blame its the lifter body, last pic I posted shows a tiny flaw near the oil hole next to the wheel, I think whats hapoened is either a piece of metal from that flaw or something embedded there from the factory and stuck in place with the tacky/waxy pre lube these come with, has then loosened up with movement and hot engine oil when running, the flaje has then moved out and acted as a wedge like brake in the wheel leading to the failure. Even with the .0005" dip in the bush the wheel turned smooth and free then would get hard to turn , almost lock, then with some effort OR by turning the wheel backward it would then free up and turn fine again for several revolutions then randomly lock again, at which time there would be no sude clearance in the wheel! When unlocked there was correct side play. I 'think' the flake was there from point of assembly because the flake is too thick to fit between the fork and wheel after assembly.