If it's the same as with my 1.6TD, the intermediate shaft pulley can't be installed backwards as the hole in the pulley and the shaft are tapered. Whatever you do, DO NOT use the intermediate shaft pulley that has edges on it. If your belt is tracking, it will litterally cut thru the timing belt. Ask how I know... I just replaced my IS pulley with one that doesn't have edges because it was cutting the belt.
In my case, I carefully looked at the pulleys and found out my injection pump pulley wasn't perfectly aligned with the others. First I torqued down the IP mounting bolts. It was a bit better but still tracked. I had to remove the IP's pulley, reinstall it and torque it to 33lb-ft. It fixed the problem. The pump's bearing wasn't worn.