Just bought a 2007 Audi B7 S4 that was in an accident and was hit at the front right if you are in the driver seat looking out. I bought it for the engine. I was told that one of the oil lines and oil pan were punctured and was given the specific oil line so I could replace the one that was broken. Engine will try crank, but won't turn over. One time it almost turned over, but failed. Was given a guarantee that the engine is working and doesn't see what it wouldn't because the engine has nothing to do with the accident it was in as they assured me when I bought it with a 20-day refundable purchase. My question is could the oil pan or oil line with a very fast leak be the reason the car does not start. I need the engine to put it in my other B7 S4 and wanted some input on if maybe the fuel pump was hit or if leaking oil(extremely fast as they told me with the oil pan and split hose) would be a reason for it not to start?
The engine doesn't need oil to start; it needs oil to not shred itself. (I would NOT try starting a motor without oil). The first step is to check if the motor spins freely: put a socket on the crank pulley bolt and try to spin it clockwise. If it spins freely and smoothly you might not have a grenaded rotating assembly, if it's locked up or extremely jagged then you definitely have a grenaded rotating Assembly.
Cars often have a device that detects an impact and switches off the engine in some way (inertia switch). Yours may have tripped in the accident and now needs resetting.
For example - https://goo.gl/images/PsvPPb
This video about an Audi inertia switch may be interesting - https://m.youtube.com/watch?v=fLZQc9SuAc4