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= Seals = | = Seals = | ||
+ | |||
+ | == Rear Main Seal == | ||
+ | === Installation === | ||
12279-H2301 Rear Main Seal | 12279-H2301 Rear Main Seal | ||
[http://i297.photobucket.com/albums/mm219/ddgonzal/sightings/forum/Rear_main_seal.jpg http://i297.photobucket.com/albums/mm219/ddgonzal/sightings/forum/th_Rear_main_seal.jpg] | [http://i297.photobucket.com/albums/mm219/ddgonzal/sightings/forum/Rear_main_seal.jpg http://i297.photobucket.com/albums/mm219/ddgonzal/sightings/forum/th_Rear_main_seal.jpg] | ||
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Also apply sealant here | Also apply sealant here | ||
[http://i297.photobucket.com/albums/mm219/ddgonzal/sightings/forum/Main_bearing_cap_sealant.jpg http://i297.photobucket.com/albums/mm219/ddgonzal/sightings/forum/th_Main_bearing_cap_sealant.jpg] | [http://i297.photobucket.com/albums/mm219/ddgonzal/sightings/forum/Main_bearing_cap_sealant.jpg http://i297.photobucket.com/albums/mm219/ddgonzal/sightings/forum/th_Main_bearing_cap_sealant.jpg] | ||
+ | |||
+ | === Removal === | ||
+ | # Remove oil pan | ||
+ | # Remove rear main bearing | ||
+ | # Lift out old seal | ||
+ | |||
+ | |||
+ | If replacing the rear main seal when changing a clutch, you may remove it with the oil pan still in place: | ||
+ | # Puncture seal with an awl, tiny screwdriver, or similar implement. Punch through the eddge of the seal, by gently tapping through with hammer | ||
+ | # Carefully pry out slightly and work your way around the circumference until free | ||
= Part Numbers = | = Part Numbers = |
Revision as of 18:01, 27 August 2013
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
Crankshaft Pulley
Lightened Crankshaft
Discussion: JTS Cranks
Seals
Rear Main Seal
Installation
12279-H2301 Rear Main Seal
Also apply sealant here
Removal
- Remove oil pan
- Remove rear main bearing
- Lift out old seal
If replacing the rear main seal when changing a clutch, you may remove it with the oil pan still in place:
- Puncture seal with an awl, tiny screwdriver, or similar implement. Punch through the eddge of the seal, by gently tapping through with hammer
- Carefully pry out slightly and work your way around the circumference until free
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