Common issue in the states with a PD motor. There is 4 more lobes on the cam so there is more pressure with less surface area. Can't say I have heard about the timing belt stripping because of it. Normally something else happens like really rough running or valve damage. If your engine is good enough to run still you should look into your oil pump to make sure it isn't damaged from the hardend metal floating around the oil. The filter gets the bigger chunks from there.