Revision as of 06:52, 26 October 2009

The crankshaft is interchangeable between early A12, A12GX, late A12, late A13 and A12A. Only the flywheel bolts differ, after 1974 using metric bolts. Stroke comes in four sizes:

70mm (2.76 in.) stroke: A12/A12A/A13(1980)
77mm (3.03 in.) stroke: A13(1974)/A14
82mm (3.23 in.) stroke: A15

1 Flywheel Bolts
2 Misc
3 Part Numbers
4 Identification
5 Crankshaft Pulley
6 Lightened Crankshaft

Flywheel Bolts

1966-1973: crank uses english-system 3/8" x 24 UNF bolts
1974-up: crank uses Metric M10 1.25 bolts

Misc

Also see: Bored And Stroked for crankshaft modifications you can perform at home.

Apparently there are two forgings of crankshaft:

Heavy duty
Light weight: thinner straight sided counterweights that also have small scollops out of them. This may be the Datsun Competition crank.

Twin-carb engine (A12GX, A12T and A14T) crankshafts are the same as a standard engines.
1974-up cranks use metric flywheel bolts. Early engines used British threads. See A Engine Redesign
Front bolt, that holds the front pulley on, is:
- Part Number: 12309-78200 ($4.58)
- M16 x 1.50 (fine) pitch
- 15mm diameter
- 27mm long
- The head is ?mm hex and about 15 mm thick.
- Torque specification: 15-16 kg/m (108-116 ft. lb.)

Part Numbers

12200-H8500 CRANKSHAFT ASSY B310 A12S, A13S
12200-H8515 A12/A12A CRANKSHAFT 70mm/2.76" stroke
12200-H5720 A12 COMPETITION CRANKSHAFT 70mm/2.76" stroke
12200-H8915 A13/A14 CRANKSHAFT 77mm/3.03" stroke
- Weight 26.2 lbs
12200-G3400 A15 CRANKSHAFT 82mm/3.23" stroke

Old Numbers:

12200-H1000 ASSY-CRANKSHAFT 1 A12 MANUAL - $624.02
12200-H1001 CRANKSHAFT 1 A12 -671 12 12200-H1000 superceded
12200-H1000 CRANKSHAFT 1 A12 0671- 2 12200-H1001 superceded
12200-H5000 CRANKSHAFT 1 A12 0572- 2 12200-H1000 $624.02

BEARING SET

12212-H1000 SET-BEARING US 1.00MM 1 A12 -
12207-M7201 SET-BEARING STD 1 A12 - 12207-H1000 $71.58
12207-H1000 SET-BEARING STD 1 A12 -
12208-H1000 SET-BEARING US 0.20MM 1 A12 -
12209-H1000 SET-BEARING US 0.25MM 1 A12 -
12210-H1000 SET-BEARING US 0.50MM 1 A12 -
12211-H1000 SET-BEARING US 0.75MM 1 A12 -

MAIN BEARING (#1/#5, SHELL THICKNESS)
4 each required

12215-H2310 .0720"
12215-H2311 .0718"
12215-H2312 .0715"

MAIN BEARING (#2/#4, SHELL THICKNESS)
4 each required

12231-H2310 .0720"
12231-H2311 .0718"
12231-12312 .0715"

MAIN BEARING (CENTER, SHELL THICKNESS)
2 required

12247-H2310 .0720"
12247-H2311 .0718"
12247-H2312 .0715"

SEAL, Front

13042-18000 SEAL-OIL CRANKSHAFT FRONT 1 A12 - superceded
13510-H1000 SEAL-OIL CRANKSHAFT FRONT (NOK) 1 A12 0271- 2 13042-18000 $7.24

SEAL, Rear

12279-18000 SEAL-OIL CRANKSHAFT REAR 1 A12 - $81.18
12279-18010 SEAL-OIL CRANKSHAFT REAR (NDK) 1 A12 0271- 2 12279-18000 NLA
12279-H1000 SEAL-OIL CRANKSHAFT REAR (NOK) 1 A12 0271- $81.18

PILOT BUSHING

32202-18000 BUSHING-PILOT 1 A12 MANUAL - $3.98

SLINGER

12302-18000 THROWER-OIL CRANKSHAFT 1 A12 - $1.57

PULLEY

12316-30000 KEY-WOODLUF 5X16 2 A12 - $1.13
12303-H1001 PULLEY-CRANKSHAFT 1 A12 0272- 0 12303-18002 $37.66
12303-18002 PULLEY-CRANKSHAFT 1 A12 - superceded
12308-H1000 WASHER-PULLEY BOLT 1 A12 - $1.29
12309-78200 BOLT-CRANK PULLEY 1 A12 - $5.73

FLYWHEEL BOLTS

12315-H1001 BOLT-FLY WHEEL 6 A12 MANUAL - $4.38
12315-H1000 BOLT-FLY WHEEL 6 A12 AUTOMATIC - $3.51
12330-20300 PILOT-CONVERTER 1 A12 AUTOMATIC - $18.66
12333-20300 PLATE-CRANK CONVERTER 1 A12 AUTOMATIC - $9.44

Identification

A13 low deck, 70mm 9.51 kg scalloped crank throws

A14, scalloped crank throws (H8940)

Crankshaft Pulley

12303-18002 PULLEY-CRANKSHAFT -0272 (multiple timing marks)
12303-H1001 PULLEY-CRANKSHAFT 0272- B110, also B210 with A13 (single timing mark)
12303-H5010 PULLEY-crankshaft (for cooler) B210 A12, A14 except USA (dual groove)
12303-H7201 PULLEY-CRANKSHAFT USA B210 with A14 (dual-groove)