One bolt is accessed from below, that's the pivot bolt, I think, it is threaded into the alt. Another is that bolt I bent my wrench on, it has nut on the end, I put an open end on the back, the fan has a clutch on it, just move till, you can get a ratchet lined up. The third is the adjustment "L" bolt, loosen on back, adjust with the other end, long 13mm.

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83 SD

84 CD