updating the Crankshaft Pulley article

slowly copying from Photobucket. I have thousands of Datsun-related photos there ...

Anyways, there are at least four twin-belt pulleys for the A-series engine, each around 129mm but with a different size front sheave:

small
medium
large
x-large (about the same size as the rear sheave)

Both the medium and the x-large i'm told are late model A12. One might be 1978 1200 ute, and the other is 1979-up. But they'll bolt to any A-series engine

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  A-series twin-belt crank pulleys.jpg (58.35 KB)


  X-large twin PULLY-1.jpg (20.41 KB)


  X-large twin PULLY-2.jpg (14.64 KB)

Here is a very common "W" pulley on Japanese auction sites. Seems to be used on the late model 1200 ute, the B122 (1981-1994)

This is the Medium size front pulley. It has eight round holes in the hub

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  B122 A12 timing cover & pulley.jpg (118.22 KB)


  A12.jpg (95.08 KB)


  a.jpg (45.78 KB)


  b.jpg (53.79 KB)


  c.jpg (41.68 KB)


  d.jpg (95.89 KB)


  e.jpg (84.69 KB)


  f.jpg (67.19 KB)

These dual-belt pulleys are for air conditioning


Here's the "large" W pulley. The rear sheave is the basic 129/130mm size and the front one smaller (but larger than the other types)




Very similar looking to the 'small' W pulley, but has no puller threads in the face of the pulley like the small type

small type has threads tapped into the face for a puller tool

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  pulley_dual-1.jpg (37.12 KB)


  pulley_dual-2.jpg (39.83 KB)

The WOODRUFF KEY clocks the pulley to the crank

12316-30000ᴳ KEY-WOODRUF 5x16
$1.98 at Nissan USA
$1.28 at Amayama

Two used at the crank snout:
* belt pulley
* lower timing gear

this key FITS:
* All A-series engines
* J-series (from Datsun 1300, Datsun 411)
* E1 engine (from Datsun 320 truck)

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  12316-30000.jpg (3.63 KB)


  12316-30000-.jpg (29.08 KB)


  12316-30000_.jpg (44.19 KB)

It's weird to me that both my A14 engines had triple sheave pulleys (both different) but neither came from a car that was equipped with anything other than the water pump/alternator, so they're both a waste of two sheaves. Probably the result of long ago repairs/alterations.