Crankshaft Pulley

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Datsun 1200 Crankshaft Pulleys came in single- and double-belt type. There was also a triple-belt type for other A-series engines.

Overview

Single Belt -- Pre-1972 (multiple timing marks)

Single Belt -- Post-1972 (single timing mark)

Double-belt: Three kinds: small, medium, large front pulley

Triple-Belt

Comparo of A-series Twin Groove pulleys

Sizes

Outside Diameter
Stock A-series: 139 mm (5.4 inch)
Nismo Option 1: 101 mm (4.0 inch)
Nismo Option 2: 75 mm (3.0 inch)

Part Numbers

Fasteners -- ALL A-series

• 12316-30000 KEY-WOODLUF 5X16 2 A12 - $1.13
• 12308-H1000 WASHER-PULLEY BOLT 1 A12 - $1.29
• 12309-78200 BOLT-CRANK PULLEY 1 A12 - $5.73
  • M16 x 1.50 (fine) pitch
  • 15mm diameter
  • 27mm long
  • The head is 27mm hex and about 15 mm thick.
  • Torque: 15-16 kg/m (108-116 ft. lb.)

B110 - 34.5mm OD, 0.64 in (16.2mm) ID, 8mm thick

• 12303-18002 PULLEY-CRANKSHAFT -0272
  • A10 & early A12 engines (multiple timing marks)
• 12303-H1001 PULLEY-CRANKSHAFT 0272- B110 $37.66
  • (single timing mark)

B210 -- all with single timing mark

• 12303-H1001 PULLEY-CRANKSHAFT 0272- B210 with A13
• 12303-H5010 PULLEY-crankshaft (for cooler) B210 A12, A14 except USA (dual groove)
• 12303-H7201 PULLEY-CRANKSHAFT USA B210 with A14 (dual-groove)

B310

• 12303-H1001
• 12303-H1002
• 12303-H8500
• 12303-H8501
• 12303-H8900 dual pulley
• 12303-H8905 dual pulley

Nissan Competition Pulley Set

Nissan Competition sold two small diameter crankshaft pulleys, which runs the accessories slower, so is suited for extra high RPM usage. For normal street use, it may run the accessories to slow for reliable usage.

Small Diameter

• 99996-H1160 SMALL DIAMETER CRANK PULLEY
  • Degreed to 40 degrees and has a diameter of 101mm/4.0". Can be used with stock alternator and w/p pulleys.

Extra-Small Diameter

The pulleys below must be used as a set and require the special belt (99996-H8020) due to their unique groove design.

• 12302-H5720 [Extra] SMALL DIAMETER CRANK PULLEY
  • Degreed to 45 degrees and has a diameter of 75mm/3.0"
• 21051-H5720 WATER PUMP PULLEY
  • Pulley has a diameter of 100mm/3.9"
• 23151-A9960 ALTERNATOR PULLEY
  • Pulley has a diameter of 90mm/3.5"
• 99996-H8020 SPECIAL BELT