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Old 03-04-2014, 09:16 AM   #1
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Rookie fan mistake?

I suspect I made a rookie mistake, but I would like confirmation.

Going by how it was on there when I pulled it off, and this Mustang Monthly image: Ford Small Block Engine Detailing Completed Photo 1

I installed my fan like this:
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Now looking at my shop manual and every other picture online, I suspect I have it backwards. Can someone please confirm for my that I'm a bonehead? Thanks!
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Old 03-04-2014, 09:30 AM   #2
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Quote:
Originally Posted by ER12883 View Post
I suspect I made a rookie mistake, but I would like confirmation.

Going by how it was on there when I pulled it off, and this Mustang Monthly image: Ford Small Block Engine Detailing Completed Photo 1

I installed my fan like this:
Attachment 149635

Now looking at my shop manual and every other picture online, I suspect I have it backwards. Can someone please confirm for my that I'm a bonehead? Thanks!

Ok you are a Bonehead. Not sure of the fan question are you asking if you put the fan on backwards. If so just tap the engine over and see which way it spins. If the fan pulls the air into the engine compartment you are good to go. If it pushes air out of the engine compartment then you have it backwards.
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Old 03-04-2014, 10:43 AM   #3
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Ok you are a Bonehead. Not sure of the fan question are you asking if you put the fan on backwards. If so just tap the engine over and see which way it spins. If the fan pulls the air into the engine compartment you are good to go. If it pushes air out of the engine compartment then you have it backwards.

Haha, thanks! So, it will still pull air the same direction either way, but one way should be much more efficient. At this point I'm thinking I'm about 70% bonehead.
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Old 03-04-2014, 10:59 AM   #4
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Haha, thanks! So, it will still pull air the same direction either way, but one way should be much more efficient. At this point I'm thinking I'm about 70% bonehead.
No not really it will pull air if it spins correctly only. The other way it may or may not push the air. Look at a regular fan and see which way the blades are bent. The engine spins clockwise so the fan should be pulling the air.

Look at this picture it will give you an idea of which way it should be put on.

289 engine fan - Bing Images
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Old 03-04-2014, 11:35 AM   #5
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Right, since the engine spins the same way no matter what, flipping the fan around, the pitch of the blade will still be going the same direction, but the curve of the blade will change (convex vs concave), so it will still pull the same direction. When you flip around a window fan, you are also changing the rotation of the motor, making it blow the other way.

The second image on the search you brought up (the one where you can actually see the fan) is the same one I found and questioned. That's the opposite of what I'm seeing in my shop manual.
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Old 03-04-2014, 11:38 AM   #6
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Sorry, make that the 3rd image. That's how I have it now, but later images show it the other way around.
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Old 03-04-2014, 01:51 PM   #7
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I think its backwards... And that's a flex fan right? it bends when it spins so if it bends the wrong way it'll hit the rad....
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Old 03-04-2014, 04:18 PM   #8
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Yep.. it's on backwards

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Old 03-05-2014, 04:36 AM   #9
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Okay, thanks guys!
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