Six cylinder volvo s80 straight engine

Timing marks must be exact. Did you check to see if valves were bent when the belt broke?

did you flash the computer to the 01 engine

The S60 model has a 2.4 five cylinder engine. That engine is not an interference engine.
The S80 uses a 6 cylinder 2.8 or 2.9 engine if it is sold in the US.

Did the piece of serpentine belt actually make contact with the timing belt ? The timing belt should have been behind the timing cover.
And does the engine crank normally ? Normal compression ?

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timing belt replacement is 168,000 km

how do i know when to change timing belt what are symtoms!

just put a compression gauge on each cylinder that will let you know if engine has a bent valve, gauges are relatively cheap. if the belt didn't have anything to do with your timing belt i doubt you have a bent valve, any check engine light? do you have spark? fuel pump turning on when key is turned to on position?

If its just a regular drive belt its impossible for this belt to "kick back" and bend a vale. However if this was a timing belt its quite possible to bend valves if it breaks. You problem could be a crank sensor that may have gotten damaged when this belt broke. If the crank sensor is damaged it won't send a reference signal to to computer therefore the vehicle would not have a spark to start. Godd Luck

Check and make sure the timing belt has not slipped. It's possible that the broken drive belt got under the timing belt and made it skip. If this happened, you are in for an expensive repair!