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Old 08-24-2012, 02:26 PM   #1
D_Lazaris
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Default 4 Blade fan hits radiator.

I did a search but couldn't come up with an answer.

I've recently installed a 4 blade fan on my 30' Model A after seeing a major crack on my original 2 blade.

Installed, the fan hits the radiator.. I am at a loss, Is there a way to bring the radiator forward? Or bring the fan back?
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Old 08-24-2012, 02:47 PM   #2
juke joint johnny
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Default Re: 4 Blade fan hits radiator.

If this is a new 4 blade fan having a cast iron hub and pressed steel blades held together by 4 bolts I wouldn't fit that either!!!
I have had one of those fly apart and take out the radiator and the water pump
Best bet to use a cast ally or plastic blade one
John Cochran
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Old 08-24-2012, 02:58 PM   #3
D_Lazaris
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Default Re: 4 Blade fan hits radiator.

It's a NOS original 4 blade, not a recast. This one is riveted together
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Old 08-24-2012, 04:22 PM   #4
ctlikon0712
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Default Re: 4 Blade fan hits radiator.

Go back to a 2 blade! lol Serioulsy though, I love my new aluminum 2 blade. For around $40 you can't beat it. And it looks like it belongs to boot!
Good Luck whatever you decide, D Lazaris.
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Old 08-24-2012, 05:13 PM   #5
TinCup
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Default Re: 4 Blade fan hits radiator.

Hits at the bottom? Hits at the waterpump shaft?
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Old 08-24-2012, 06:38 PM   #6
D_Lazaris
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Default Re: 4 Blade fan hits radiator.

The fan blade hits the bottom of the radiator but not at the top. It clears the water pump housing fine
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Old 08-24-2012, 07:17 PM   #7
Fred K-OR
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Default Re: 4 Blade fan hits radiator.

Are the blades bent forward?
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Old 08-24-2012, 07:33 PM   #8
Phil Noonon
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Default Re: 4 Blade fan hits radiator.

I had that happen and it turned out that the keyway hole had broken and was allowing the fan blade to wobble which allowed the fan to "hit" against a part of the radiator as the blade rotated.
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Old 08-24-2012, 08:52 PM   #9
wildwilly
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Default Re: 4 Blade fan hits radiator.

I had to try a few fans to find one with the right pitch an size to clear everything
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Old 08-24-2012, 09:51 PM   #10
Charlie Stephens
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Default Re: 4 Blade fan hits radiator.

Does your hand crank line up properly if you try to crank the car?

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Old 08-25-2012, 12:15 AM   #11
pat in Santa Cruz
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Default Re: 4 Blade fan hits radiator.

I worked on a 39 Ford with that problem. Turns out the fan was for a truck, and the blades were longer than one for a car, so they hit the lower radiator core.

ever try to replace a water pump equipped with a 4 blade?? the radiator has to come out. With a 2 blade, it does not. The advantages of a 2 blade out number the 4 blade in performance, fit, appearance, and cost.
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Old 08-25-2012, 07:52 AM   #12
1931 flamingo
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Default Re: 4 Blade fan hits radiator.

Try loosening the radiator mounting bolts and move the rad forward at the bottom?? Are the blade lengths the same on the 4 blade as the two blade?? Fan "seated" on the w/pump shaft??
Paul in CT
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