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Old 09-04-2022, 05:17 PM   #1
spock345
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Default B18/B20 six blade radiator fan.

I found something interesting while scrounging in the engine bay of a Amazon that was a bit too close to a house fire. A six bladed mechanical fan but small enough to fit an Amazon radiator and without a fan clutch.

It is similar in footprint to the stock metal four blade and plastic five blade fans and was mounted to the water pump with a little aluminum spacer. The blades are secured to the middle with rivets much like the later metal clutch fans.

Is this fan a niche OEM option or something aftermarket? Is it safe to run? I've heard some stories about the later clutch fans that had rivets give way. I gave it a quick repaint and it fits perfectly.
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Old 09-04-2022, 05:25 PM   #2
Redwood Chair
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The OE flex fan was a 1970 only deal, and used with a ~7/8" spacer in the 140 application.

Much sought after back in the day for use with the early top loader smaller radiator.

NB:

Stand / keep clear when revving it up as they have been known to shuck a blade when over-revved.
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Old 09-04-2022, 06:47 PM   #3
hiperfauto
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The 6 blade rigid fan was part of the A/C kit. It's safe to run but most of them I see have bent blades. They're designed to be very close to the radiator and it doesn't take much for the engine to shift forward and make contact.

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Old 09-04-2022, 09:02 PM   #4
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Quote:
Originally Posted by hiperfauto View Post
The 6 blade rigid fan was part of the A/C kit. It's safe to run but most of them I see have bent blades. They're designed to be very close to the radiator and it doesn't take much for the engine to shift forward and make contact.

I did notice that the fan had a spacer stuck to it by old paint. I pried that off before painting it. I am guessing that was to get it close to the radiator. Any diminished performance from removing that spacer to give a bit more clearance?

Luckily this one doesn't seem to have any obviously bent blades.
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Old 09-04-2022, 09:05 PM   #5
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I think the fan will hit the generator pulley nut without the spacer.
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Old 09-04-2022, 09:26 PM   #6
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Quote:
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I think the fan will hit the generator pulley nut without the spacer.
Surprisingly it doesn't. At least on my car with a delco alternator.
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