On the left as you look at the picture is TONY PUSKIN and on the right is "CHICAGO" BAILEY. Between the two of them they can fix most anything. And they do get lots of practice. The Detroit Diesel engine in the M113 was a work horse but it did need clean air filters and new engine oil every now and then. Keeping the transmission working was the bigger chore. It had to be adjusted frequently. But when it was right, it was right.
Hot work so a cool one every now and then is in order.