Originally Posted by sun tortise

Replaced my alternator due to extreme ovalization of the pivot holes, and when i installed the old belt on the new alternator, it would not tighten within the range of the adjuster. It is Contitech 13 x 1030. I see that Pelican also has a 10 x 970 listed for my 1981 240D. How could that be?

My old belt is quite worn from running crooked for maybe 20,000 miles. Could that make it stretch or sit lower in the groove enough that it is too loose to tighten sufficiently?? Or do i need a smaller belt?

Thanks