GrimmSpeed Subaru Lightweight Crank Pulley - Manual (Page 3)

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5. You will then need to loosen the right alternator tension bolt with a 12mm socket.
6. Press down on the alternator to relieve the belt tension and remove the belt.
7. Removal of A/C belt for pre-2008 models. 2008+ owners please skip to install step 9.
Loosen the A/C idler tension lock nut using a 12mm wrench.