I used to be an apprentice mechanic when i first left school and had previously been shown how to do the job I was doing that day.
It was rebuilding a MERCEDES diesel engine for a massive earth remover, the pistons were over 12" in diameter (F***ing big in other words !).
Any how I rebuilt the entire engine, 8 cylinders, took me a full day !
The mananger came in to check my work and there's an inspection cover built into the side of the piston block to view the piston rings, which he did, (I'd fitted the wrong ones !, they weren't thick enough so the oil and fuel would mix !).
I got a written warning for it, even though I only fitted the ones they gave me to fit !, they said I should have noticed such a discrepancy in the piston ring size.
The whole engine had to be re stripped costing shed loads of money and we lost the contract for future work with the owner of the trucks !.
That was back in the late 70's.
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