If the timing was off, from my experiance, it would cause the valve to go down threw the piston. The rod more than likely was on its last leg before the repair. Because the timing actually keeps the crank shaft (that turns the rods/pistons up and down) and the cam shaft (makes the valves go up and down) in sequence. So if the timing were off then the valves would be down when the piston were up. This could cause the rod to break but usually it either cause the valve to punch a whole threw the piston or the piston to bend the valve. Either case is very bad but so is a broken rod.
Hope this helps
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What engine? Any indication/warning, such as oil light coming on, or oil pressure dropping? A lot things to consider here.
No....unless work done caused an oil leak, the two items are unrelated. Generally, you should have noticed knocking or low oil pressure before the rod entirely failed. (rods generally don't break unless the rod bearing fails)
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