3176 DIESEL TRUCK ENGINE Caterpillar

Belt Tightener.

(1) Alternator.

(2) Poly-vee belt.

(3) Front housing.

(4) Stops (for belt tightener travel).

(5) Pry hole [12.9 mm (.50 in) square for 12.7 mm (1/2 in) drive ratchet]

(6) Belt tightener travel (installed on engine) ... 71°

(7) Belt path on to the damper pulley.

(8) Pulley width ... 34 mm (1.3 in)

(9) Pulley width crown ... 0.25 mm (.010 in) max

(10) Pulley diameter ... 76.2 ± 0.5 mm (3.00 ± .02 in)

(11) Protrusion of dowel (used to position belt tightener on front cover of engine) ... 6.3 ± 0.5 mm (.25 ± .02 in)