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The crankshaft is interchangeable between early A12, A12GX, late A12, late A13 and A12A. Only the flywheel bolts differ, after 1974 using metric bolts.

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1 Overview
2 Flywheel Bolts
3 Misc
4 Identification
5 Crankshaft Pulley
6 Lightened Crankshaft
7 Seals
8 Part Numbers

Overview

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

Flywheel Bolts

1966-1973: crank uses english-system 3/8" x 24 UNF bolts
- 12315-18000 BOLT-flywheel & drive plate 6 A10
- 12315-H1001 BOLT-FLY WHEEL 6 A12 MANUAL
- Will ARP 206-2802 work? For BMC A-series engines (UHL Under Head Length 0.900") $18 USD/set of 6

1974-up: crank uses Metric M10 1.25 bolts (from '73-7)
- A12,A13,A14,A12A,A15
- 12315-H6900 BOLT-FLYWHEEL 6 $4.83 USD
- replaced 12315-H6200
- Will ARP 203-2802 work? For 4AGE engines (UHL Under Head Length 1.050") $22 USD/set of 8

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.)

Identification

A13 low deck, 70mm 9.51 kg scalloped crank throws

A14, scalloped crank throws (H8940)

Crankshaft Pulley

See Crankshaft Pulley

Lightened Crankshaft

Discussion: JTS Cranks

Seals

12279-H2301 Rear Main Seal

Also apply sealant here

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12200-H1001 CRANKSHAFT 1 A12 -671 12 12200-H1000 superceded 
12200-H1000 CRANKSHAFT 1 A12 0671- 2 12200-H1001 superceded 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

BEARINGS
* See main article: Bearings

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-H2301
* supercedes 12279-H1000 SEAL-OIL CRANKSHAFT REAR (NOK) 1 A12 0271- $81.18

PILOT BUSHING 
* see Pilot Bushing

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

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

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Crankshaft

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