Well, I overestimated our usage on the #4 lines. We have 45 buses with the 5.9 CR. Looks like we replaced (5) in the past 12 months, (14) total. Two of them have had to be replaced more than once, but they were not replaced with the same part number, both were the next number in the supersession. We have never replaced the latest number, 5289447.
We have also replaced:
• (3) Number 1’s
• (1) Number 2
• (1) Number 5
I will also add, the #4 is commonly mistaken as #5 because of its location on the rail. They miss #6 on the end and see it’s the next to the last one on the top, therefore it MUST be #5.