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[Datsun 1200 encyclopedia]

Flywheel

(Difference between revisions)

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Categories: Clutch | Engine Mechanical

Revision as of 23:59, 3 December 2015
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Revision as of 08:43, 3 January 2016
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Line 83: Line 83:
Interchangeability with Datsun 1200: none Interchangeability with Datsun 1200: none
= Part Numbers = = Part Numbers =
-* 12310-18001 ASS'Y-FLYWHEEL B10+ * 12310-18001 ASS'Y-FLYWHEEL B10
-* 12310-18002 ASS'Y-FLYWHEEL B10 (from E/# A10-87871)+ * 12310-18002 ASS'Y-FLYWHEEL B10 (from E/# A10-87871)
-* 12310-H1000 FLYWHEEL ASS'Y A12, A12S, A12A, A13S+ * 12310-H1000 FLYWHEEL ASS'Y A12, A12S, A12A, A13S
-* 12310-H6200 ASSY-FLYWHEEL A13+ * 12310-H6200 ASSY-FLYWHEEL A13
-* 12310-H7200 FLYWHEEL ASS'Y A14 -7909+ * 12310-H7200 FLYWHEEL ASS'Y A14 -7909
-* 12310-H7201 FLYWHEEL ASS'Y A14 7910-8010+ * 12310-H7201 FLYWHEEL ASS'Y A14 7910-8010
-* 12310-H8900 FLYWHEEL ASS'Y V A14S, A15 8011-+ * 12310-H8900 FLYWHEEL ASS'Y V A14S, A15 8011-
-* 12310-H8910 FLYWHEEL ASS'Y A14S, A15 8011-+ * 12310-H8910 FLYWHEEL ASS'Y A14S, A15 8011-
-* 12315-18001 BOLT-flywheel & drive plate (from E/# 87871) (6) B10+ 
-** 12314-18002 WASHER-flywheel + BOLTS - See [[Crankshaft#Bolts]]
-** replaced 12315-18000 BOLT-flywheel & drive plate (6) B10+ 
-*** 12314-18001 WASHER-flywheel + * 12313-10600 DOWEL (3) all A-series A10-A15
-* 12315-H1001 BOLT-flywheel (6, 3/8") B110 -1973+ * 12312-18000 GEAR-ring, flywheel A10/A12/A14
-* 12315-H6200 BOLT-FLYWHEEL (6, 10mm) 1974-+ * 12312-18010 GEAR-ring, flywheel A14S 8110-
-* 12313-10600 DOWEL (3) all A-series A10-A15+ 
-* 12312-18000 GEAR-ring, flywheel A10/A12/A14+ BUSHING-pilot: see [[Pilot Bushing]]
-* 12312-18010 GEAR-ring, flywheel A14S 8110-+
-* BUSHING-pilot: see [[Pilot Bushing]]+
The flywheel "Assembly" includes these parts: The flywheel "Assembly" includes these parts:
Line 106: Line 104:
* 12313 DOWEL-flywheel * 12313 DOWEL-flywheel
-* ATP ZA543 Flywheel Ring Gear $22.79+[http://www.rockauto.com/catalog/x,carcode,1208483,parttype,5360 RockAuto.com]
-** http://www.rockauto.com/catalog/x,carcode,1208483,parttype,5360+ 
-** Outer Diameter=10.655"+ ATP ZA543 Flywheel Ring Gear $22.79
-** Inner Diameter 9.451"+ * Outer Diameter=10.655"
-** Pitch=10/12 Width=.400"+ * Inner Diameter 9.451"
-** Teeth=105+ * Pitch=10/12 Width=.400"
-** Chamfer=FRONT #1231218000+ * Teeth=105
 + * Chamfer=FRONT #1231218000
= Photo Index = = Photo Index =

Revision as of 08:43, 3 January 2016

Datsun 1200 uses a traditional type of flywheel at the back of the engine. The face matches the Clutch while a ring gear is attached to the perimeter for the Starting Motor to turn the engine. It uses a 271mm (10.7 inch) flywheel with a 105-tooth ring gear.

Contents

Overview

All flywheels for A-series engines interchange -- for rear-wheel drive vehicles. The A12 flywheel weighs 2.2 lbs (1 kg) less is the main difference. The A12 flywheel is also thinner.

23641.jpg

A10              8.0 kg (17.6 pounds)
A12 12310-H1000: 9.5 kg (20.8 pounds) 
A12 12310-H2310: 6.4 kg (14.1 pounds) GX, also sold as 'Race Option'
A14 12310-H7200: 10.7 kg (22.3 lbs)

A14/A15 flywheel is thicker than the A10/A12 flywheel. When fitting the thinner flywheel to A14, remove the Engine Plate to compensate.

A10: 25 mm thick? (does not fit A12 due to different gear angle)
A12: 28 mm thick (fits A10)
A14: 30 mm thick

In 1974 flywheel bolts changed from British Threads to Metric threads. So the bolts are not interchangeable from early to late. See Crankshaft for details.

A12 Flywheel Measurements:

thickness: 28mm
ring gear + backing: 20mm
back rim to flywheel face depth: 5mm
clutch face to inner face depth: 17mm

11151.jpg

Inspection

If the starter made ocassional grinding sounds, chances are the flywheel ring gear needs replacing (or just replace the whole flywheel, which is often less expensive).

Yes, you should resurface the flywheel if it is not in good shape!!! Better to not re-grind the flywheel if it doesn't need it.

It is not indicated to turn the flywheel UNLESS cracks appear, or it is not flat (worn unevenly), or the surface is burnt (heavy glazing). Guys will tell you "it is cheap insurance" to machine the flywheel clutch surface regardless, but that's not what the Datsun factory service manual says.

Wash ... in suitable cleaning solution to remove dirt and grease ... Check friction surface of flywheel and pressure plate for scoring or roughness. Slight roughness may be smoothed by using fine emery cloth. If surface is deeply scored or grooved, the part should be replaced.

- 1980 B310 service manual

If it is warped, have it resurfaced. It is it burnt, chattered, or is grooved, resurfacing is called for. But it if still worked great, is flat, and not burnt, don't bother. The Nissan factory service manual does not recommend a resurface unless needed. Every time my Datsun flywheel did not look great, I should have resurfaced it. And everytime it looked great and I didn't resurface it, all was fine.

If the teeth are worn, replace ring gear
23497.jpg

Flange damage
24122.jpg 24124.jpg

Removal and Reinstallation

The crankshaft needs to be locked from turning when removing or tightening the flywheel bolts.

Flywheel Stop:
23604.jpg 23490.jpg

23498.jpg 23560.jpg

Lightening

For race cars, a light flywheel allows the engine to rev faster according to this principle:

The more weight, the more time it takes to accelerate


Now a street car wants a heavier flywheel, so that it will:

  • smooth out the combustion pulses
  • smooth out the drivetrain

These are the factory specs for flywheel weight reduction:
3913.jpg 1014.jpg

Finished wheight is about 6.5 kgs --a total of 2 kgs removal

Reference: Datsun B110 Competition Tune-Up Manual, Nissan Motor Co. Ltd., Tokyo Japan 1974

Bolts

Nissan flywheel bolts are very strong. Just clean the threads and use a torque wrench to install. ARP does not make A-series flywheel bolts, but in any case the stock bolts are strong.

Best practices:

  • Reusing the flywheel bolts is acceptable. Even new bolts will come loose due to shaking. Even ARP bolts will snap!
  • Always re-balance the engine after changing rods or pistons or crank
  • For 7000 rpm have the flywheel doweled. Loctite is not needed.
  • Do not get the flywheel bolt "good and tight", as overtightening weakens them. Always use a torque wrench.
  • Use stock Datsun flywheel bolts. If using aftermarket bolt, ensure they are 1) not too long and bottoming out 2) ensure the head face shoulder design is compatible 3) Use high strength steel like the factory bolts

If using high RPM, look at getting the crank flange dowelled. The flywheel is actually clamped on the head of the bolt not on the shank of the bolt (there is side-to-side play), so three dowels 120° apart should do the job. The end of the crank is soft unlike the journals and easy to drill.

Also see: Harmonic Balancer.

FWD

Front-wheel-drive flywheel from E10 Cherry/120A, F10 Cherry/F-II or N10 (310/Pulsar) is smaller diameter and the clutch fits down inside the FWD flywheel.

13801.jpg 13802.jpg 13803.jpg

Interchangeability with Datsun 1200: none

Part Numbers

* 12310-18001 ASS'Y-FLYWHEEL B10
* 12310-18002 ASS'Y-FLYWHEEL B10 (from E/# A10-87871)
* 12310-H1000 FLYWHEEL ASS'Y A12, A12S, A12A, A13S
* 12310-H6200 ASSY-FLYWHEEL A13
* 12310-H7200 FLYWHEEL ASS'Y A14 -7909
* 12310-H7201 FLYWHEEL ASS'Y A14 7910-8010
* 12310-H8900 FLYWHEEL ASS'Y V A14S, A15 8011-
* 12310-H8910 FLYWHEEL ASS'Y A14S, A15 8011-
BOLTS - See Crankshaft#Bolts
* 12313-10600 DOWEL (3) all A-series A10-A15
* 12312-18000 GEAR-ring, flywheel A10/A12/A14
* 12312-18010 GEAR-ring, flywheel A14S 8110-
BUSHING-pilot: see Pilot Bushing
The flywheel "Assembly" includes these parts:
* 12312 GEAR-ring, flywheel
* 12313 DOWEL-flywheel

RockAuto.com

ATP ZA543 Flywheel Ring Gear $22.79
* Outer Diameter=10.655"
* Inner Diameter 9.451"
* Pitch=10/12 Width=.400"
* Teeth=105
* Chamfer=FRONT #1231218000

Photo Index

1014.jpg 1268.jpg 1280.jpg 1481.jpg 1487.jpg 2513.jpg 3152.jpg 3507.jpg 3913.jpg 3923.jpg 4890.jpg 5326.jpg 5428.jpg 5429.jpg 5430.jpg 5509.jpg 5510.jpg 5511.jpg 5512.jpg 6208.jpg 6209.jpg 7013.jpg 7979.jpg 8003.jpg 9259.jpg 9260.jpg 9372.jpg 10428.jpg 11108.jpg 11151.jpg 11152.jpg 11251.jpg 13202.jpg 13203.jpg 13308.jpg 13801.jpg 13802.jpg 13803.jpg 14582.jpg 14583.jpg 15048.jpg 16025.jpg 16026.jpg 16027.jpg 16767.jpg 16768.jpg 16998.jpg 17232.jpg 17505.jpg 17506.jpg 18542.jpg 19041.jpg 19725.jpg 20430.jpg 21562.jpg 21903.jpg 21905.jpg 22568.jpg 22569.jpg 23490.jpg 23496.jpg 23497.jpg 23498.jpg 23560.jpg 23604.jpg 23641.jpg 24122.jpg 24124.jpg 24899.jpg