I think that cover might have been rubbing and you tweaked it enough to clear. I definitely hear the difference between the two videos! The belt is usually able to move a little bit on the pulleys, so as long as it's not super loose you should be fine. Deflection looks good, nothing excessive. As l...

It's kind of hard to hear on the video, but I can make out a strange noise. Is the tensioner set properly? It should be a hydraulic tensioner on that car, so it's unlikely to be an issue being that they're self-adjusting. It wouldn't be a bad idea to check to make sure that there isn't too little d...

the tensioner seems to set properly. I can take a video of me poking around the belt with the engine off to show what it looks like. As for the covers, im confident its not the upper cover or the timing belt cover rubbing on anything as there is no difference in The noise with them on or off. As for...

My 850 is making this whirring humming noise from the front of the engine. Some background info: The noise started after I took the head off to replace valve stem seals. After putting it back together, I did a full timing belt service with genuine volvo and oem parts. I already ran the engine with t...