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Discussion Starter #1
I posted this on the GTV forum but would like to broaden the audience. Has anyone with a new 6-blade engine fan noticed that the hub mounting surface is offset differently than the original Alfa fan? Original Alfa 2.0L fan (from '74) had the mounting plane roughly halfway through the fan, while the new repro units have it much deeper into the fan. This is causing interference issues with my 2.0L motor's A/C pulley--even with the original spacer installed. Basically, the new fan sits 10mm aft of where the old fan sat. Apparently not an issue with non-A/C cars. Were there different size factory spacers? Parts book lists only one fan type for A/C, non-A/C US cars. Thanks much!
 

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I noticed this, too, when I installed a new fan last fall, stock fan from IAP. Have you tried turning it around the other way? I honestly can't remember which way I installed mine.
 

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There is a curvature to the blades that needs to 'go with the flow' persay.

It'll physically go on either way if nothing gets in the way, but the wing~ish curved shape of the blades is meant to enhance airflow efficiency. It'll move air anyway if its on backards of course, but the correct way is SO much better than the other AFA volume moved.
 

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Discussion Starter #5
It's true they are directional (specific front and back). Rear side has a stepped groove to hold the fand blade radially, even though the bolts can serve this function. Mine is definitely the thick US-spec.
 

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plastic fans

There are 3 different fans that were used over the years. 1600 and USA 1750 are one type, Euro 1750-2000 with thinner blades, and USA 2000 which is offset forward toward the radiator. This allows it to clear multi-groove belt pulleys.
KG
 
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