Fan tale

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Fan tale

Postby albaran » Tue Jan 14, 2020 7:52 am

Most of you with the standard type 1 VW fan will never experience this but I wanted to document it anyway. I was getting a bad rattling sound from the engine at idle. When I pulled everything apart, I found that the fan mounting hole was egged out from the standard "D" shape. I replaced it with one of those welded and balanced fans but it was too far out of round. I ended up using the standard EMPI fan which had the least run out. Even though I have a custom shroud, the pulley, alternator, arrangement is stock VW. I replaced everything with the right amount of shims and the right torque on the fan nut. Now everything runs quiet like it should.
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Re: Fan tale

Postby RVosari » Tue Jan 14, 2020 1:57 pm

Al,

Does your shroud set-up use the standard 3-piece deal with the (bright metal) stiffener ring ?

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Re: Fan tale

Postby albaran » Wed Jan 15, 2020 8:05 am

No. I have a set but am using the solid aluminum backing plate instead.
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Re: Fan tale

Postby RVosari » Wed Jan 15, 2020 11:57 am

Al,

That's a sturdy looking item...check "wobble" both up and down and in and out, when the motor is idling. My P. Downs motor's fan is around half-a-thou in both planes...which should not create undue vibrations.

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Re: Fan tale

Postby albaran » Wed Jan 15, 2020 12:28 pm

It's solid. No movement.
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Re: Fan tale

Postby RVosari » Thu Jan 16, 2020 10:38 am

Al,

So what was the source of the "noise"...

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Re: Fan tale

Postby egrant5329 » Fri Jan 17, 2020 7:10 am

Albaran What kind of fan is that?
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Re: Fan tale

Postby RBP » Fri Jan 17, 2020 7:35 am

Looks like what I have on the DTM.
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Re: Fan tale

Postby egrant5329 » Fri Jan 17, 2020 8:26 am

He mentioned the D shaped hole, so it made me wonder what the fan is. I use the standard Type-1 fan with my DTM. It would take something extraordinary to round it out anywhere close to what his pic looked like.
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Re: Fan tale

Postby DannyP » Fri Jan 17, 2020 8:51 am

I believe Al has a bullet-shaped cone attached there, perhaps the whole assembly cannot be tightened enough? I believe it's a model airplane prop spinner. The spinner has an aluminum backplate. I'm guessing this caused the fan to get it's center hole to wear and become oblong.
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Re: Fan tale

Postby albaran » Sun Jan 19, 2020 11:44 am

Danny, I had the noise problem long before I put the nose cone on. I suspect the problem was caused by one of those aftermarket Chinese pieces that didn't allow the fan to bottom out the hub. This. time, I fitted the D shape hole to the hub by carefully filing it enough to allow a slip fit. Runs quiet now.
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Re: Fan tale

Postby DannyP » Mon Jan 20, 2020 6:20 am

Excellent, Al. Glad you got it sorted. Maybe this year at LRP Vintage fest I'll have my car, it's all back together and running well now. That stupid main shaft circlip in the transmission($2) really messed me up. They are a one-time use throwaway item. At least I know that now........
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Re: Fan tale

Postby albaran » Mon Jan 20, 2020 8:09 am

Here is another example of a type 1 fan and hub problem like the one I had. The example is between 1:39 and 2:54 on the video. https://www.youtube.com/watch?v=rMsp3l8AI80
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