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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.
Contents |
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
- A12
-
- A13 low deck, 70mm 9.51 kg scalloped crank throws
-
- A14, scalloped crank throws (H8940)
-
- A14
-
Crankshaft Pulley
Lightened Crankshaft
Discussion: JTS Cranks
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- 12200-H1001 CRANKSHAFT 1 A12 -671 12 12200-H1000 superceded
- 12200-H1000 CRANKSHAFT 1 A12 0671- 2 12200-H1001 superceded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 (also see Pilot Bushing
- 32202-18000 BUSHING-PILOT 1 A12 MANUAL - $3.98
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