Hello everyone.
Autopsy done on collapsed ( crane hydraulic roller) lifters.
3 that collapsed had markings inside lifter body ( see pics).
Pushrod cup didn’t want to come out.
After I got them out , I found the marks on the inner bore of the lifters on the cylinder side only not any marks on the cam side of lifter bore.
My thoughts are the extreme angle of the pushrod may of contributed to this marking.
All marks were approx .070”below retaining clip ( about preload location). This wear is a what may of contributed to lifter failure.
I did go way over redline (7500 plus), but that should have not destroyed the lifters.
Also most lifters are fine.
I guess my point is how much effect of the 59 degrees caused this failure.
My two cents for the day.
John
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