Z31/Crankpulleydifferences

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The Z31 came with four different Crank pulleys. Non turbo from 84 to 86 had all V-belts. The turbo models used a ribbed belt for the alternator and v belts for the other accessories. Early 1987 models switched to to all ribbed micro v belts. The later models 4/87-89 used a longer snout on the crank shaft, therefore using a new pulley that is a 13.6 mm thicker.

84-87 Non turbo Crank Pulley

The 84-86 non turbo models have all V belts.

84-86 Turbo Crank Pulley

The 84-86 turbo models have 2 V belts and 1 ribbed micro V belt.

pre 4/87 Crank pulley

The pre 4/87 crank pulley uses all ribbed micro V belts like the W-series but does not have the same offset.

post 4/87-89 W series Crank pulley

The crankshaft front tip was lengthened by 18.7 mm (0.736) in. See illustration (1). The crankshaft pulley width was increased by 13.6 mm (0.535 in.) as shown (2). The pulley bolt was changed from M12 to M14, and the washer inner and outer diameters were increased. (See illustration.)