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timimg belt tensioner froze up, broke timing belt 900

I've learned a lot just from reading the forum, but now I need something I didn't see before. My 93 Volvo 940 non-turbo, B230F quit on me this morning. I removed the oil cap and had my wife turn the engine over and the cam shaft wasn't turning. I pulled the top timing belt cover and found that the tensioner is frozen up and the pulley isn't rotating. The belt hasn't been making noise, but the pulley has a flat spot where its worn into the metal. I need to replace the tensioner and figure out how to time the cam and crank. Here's where I need your help. How do I compress the tensioner? How do I determine what turn to align the cam and crank? I have a manual ordered but it doesn't do much good today.

Thanks for taking the time and effort to help so many people, including me.






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