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Hello again,
I figured that you would have the mechanical tensioner, as most '98 models do (not all). As for the interval, should be 105k but I'd do it now also. As you guessed, the tensioner is easy to do yourself. As long as you know the proper procedure, I think it's actually easier than the hydraulic type (I can do a belt with a mechanical tensioner in 1/2 hour). As for the procedure, here goes. You will need a 6mm allen wrench and a 12mm socket. Loosen the center nut and move the allen wrench to the 10 o'clock position. Replace the belt. When setting the tensioner at 68° or so ambient temp, the indicator should be exactly centered in the window. Colder temperature will put the indicator further to the left, warmer (such as operating temp) would put it further to the right side. I always recommend a cold engine and a warm day. Make sure that the indicator enters the window from the right side. In other words, tighten it too tight and then back it off. When centered, tighten the nut. Rotate the crankshaft two turns and recheck the alignment. If necessary, readjust, again making sure to go to the right and then back. When done, push lightly on the belt between the water pump and the exhaust pulley. The tensioner indicator should move freely when you push on the belt. Anyway, it is easier than it sounds. Let me know if you have any further questions. I'm glad to help.
Good Luck,
Joe S. - Volvo Master Technician
2000 S70 AWD, 1995 850 Turbo, 1981 242 Turbo w/intercooler
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