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)
18002

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

Double-belt: Four kinds of front pulley: small, medium, large adjacent and & large skip

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)
B122 aircon pulley 129 mm, 22 mm groove pitch
 

Part Numbers

Fasteners -- ALL A-series

* 12316-30000 KEY-WOODRUF 5X16 - $1.13
  
  two used, one for engine crankshaft pulley, one for lower timing gear
  Buy at Bprojects
  key FITS: 
  * All A-series
  * J-series
  * E1 engine (from Datsun 320)
 Width: 15mm
 Height: 6mm
 Thickness: 4.8mm

* 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.)

Comparison: L16 key 00926-51600 5x16 Woodruff Key is NOT the same part number

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