Starting in 1973 a number of FIAT models for the USA market only had the smog pump driven by a toothed belt (a sort of miniature timing belt) to avoid the cost of a tensioning idler pulley, but the drive came off the camshaft. The result was that when, inevitably, the smog pump seized up, the jerk against the camshaft pulley stripped the teeth off the timing belt at the crankshaft pulley, and since these were all interference motors -- oh what a mess, just to save a few thousand Lire (a couple of Bucks). Why didn't they just use a VW style shimable pulley?