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check for moisture in the distributor cap if you have one. Check that the HT leads are not touching each other causing a misfire through the lead with no compression in the cylinder. Use lead separators to stop the leads touching
It is very likely you have damaged the engine, the reason for it going could be a few things but if the belt was quite new then it may not have been fitted properly, the metal noise could have been the tensioners giving in or the pulley wheel rattling loose, have you investiagted the engine yet?
Firt thing to do is remove the cam cover and see whats going on araound the belt.
get back to me for more info once you have looked.
You mean the serpentine belt . Do you ? If thats what you mean, the tensioner is a component that has a bolt at the middle which when lossened with a wrench will lossen the tension on the serpentine belt it has a spring and can be moved . if it was a seperate belt it woud have a bolt and a brace with a U shaped hole in the middle. You would lossen the bolt and pull on the belt and it lossens up.
The Saab fan is electrically controlled directly via the ECU and has no belt. I will therefore assume you are referring to the accessory belt that drives the power steering pump, the alternator, AC, etc. Pictures and step by step instructions are here and here. Both of these sites are also demonstrating the use of a shorter belt to bypass a center idler pulley that fails frequently (and that was eliminated altogether by Saab in the transition from new generation 900s to the first iteration of the 9-3 model).
The Saab accessory drive belt is self-tensioning by means of a tensioning pulley. The excessive play means that your current belt is spent and must be replaced. It is a very good idea to replace this pulley at this time as the bearings fail over time. You can get an aftermarket pulley of machined billet aluminum construction with a repalceable bearing race from Wazee Pulleys. This pulley is superior to the stock one in just about every conceivable way. You will need a 1/2 inch socket extension bar that will fit exactly in the top of the tensioning pulley housing and a six mm allen key. This site shows the proper routing of the stock belt and the routing procedure to bypass the highly failure prone center idler pulley if you so elect, as well as the procedure to remove and fit a new belt. Note, the belts shown on this site are for the short-belt modification only. The stock replacement belt is Part Code: 4904728Brand: Description: Serpentine belt for any 94-98 NG 900 4cyl.
The belt ratcheting mechanism is knackered. I have tried twice to fix this problem and simply could not do it. My ultimate solution was to buy a used belt from Goldwing Saab in NY and install that. It is about a 35 to 40 minute job in the verts.