snapped oil pump sproket why?

[TalonFULLtune]

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problems with my 1g tsi awd with 97 7bolt swap still on 1g ecu.
im at a complete loss with this not sure what it could be. long story kinda short i was headed home from town i pulled out of the gas station and got into it too
3rd gear then cruised at about 50 the rest of the way home. on the way car shuts off i pull over pop the hood. oil filter had come loose. and the timing belt slipped. so i towed it home with my truck. i notice i had coolant in the oil so i figured it blew the headgasket too. i pulled the head checked the valves they looked good. no signs of hitting the pistons ethier. i cleand the head and block surface. layed a mls on it and stuck the head back on. put a new timing belt and balance shaft belt in. timing looked dead on. i started it sounded good at idle i let it warm up and i gave it some small revs to see if it sounded right. all sounded good untill i hit about 4k it backfired like a canon and shut off. when this happend it cracked my oil pump sproket in half. any ideas on what could cause this. please give me any suggestions.
thank you for your help in advance.

 

[bryanwheat]

I would be willing to bet that at some point the oil pump locked up and is what caused the belt to slip. The reason for it locking up is likely the filter coming off. The engine will lose all oil in a matter of seconds if the oil filter comes loose. I'd be willing to bet that you have at least a locked up pump, and likely some bottom end bearing damage.

 

[TalonFULLtune]

ok well i havent messsed with it much after this happend how can i tell if the pump is locked up. the pully spins fine.

 

[bryanwheat]

ok well i havent messsed with it much after this happend how can i tell if the pump is locked up. the pully spins fine.

I would pull the pump and inspect the gears. Likely the shaft is seizing when it warms up, or intermittently.

 

[TalonFULLtune]

ok ill check that out and let you kno if you dont mind helping me out with this issue. towing the car to my house hopfully 2mro. this is my first dsm so bare with me. is there a rebuild kit for the oil.

 

[TalonFULLtune]

well i pulled the car up to the house took a closer look at it. seems like when the sproket busted some of the oil pump case right around the shaft broke off. not sure what this means for the inside of the motor getting ready to take the oil pump off 2mro hopefully after work. might just start looking for another motor for it. and rebuild that one. anybody have a nice 7 bolt out there?