Dropped Engine
I use to have 45 Semi's and 48 trailers.
When I hauled freight I was responsible for it from the time I had it in my trailer till it was on there dock.
Regardless if my equipment broke or it was broken in my care.
I don't buy that he couldn't know the bolt was bad,it's his job to make sure it was up to the task.
Part of his service was to load the engine in my truck.
I know this is harsh,but I paid good money for this engine work and it was 2 months late.