The Ford Barn

Tom B. · 07-31-2015, 02:24 PM

I'm getting a sound like a low pitched siren from the front of the engine when I rev it up. I took off the fan belt and it went away. Could it be the pitch of the fan blades?
Tom B.

V8COOPMAN · 07-31-2015, 02:31 PM

It could be the fan, but I'd bet it's the generator itself. Assuming a stock set-up, unbolt the fan from the pulley and run the generator to see if the noise still persists....report back. DD

Kurt in NJ · 07-31-2015, 08:32 PM

When was the last time you oiled the rear bushing on the generator

look at the fan blades while turning ---does it look like they wobble, do any blades have a different angle ---any nicks in the blades

there are different pulleys and fans too ,a small pulley will make the fan turn faster, the heavy duty truck fan will make more noise

the belt could be worn and slipping

Tom B. · 08-01-2015, 11:42 AM

I removed the fan and the noise disappeared. Where can I get a correct fan?

Joe Immler · 08-01-2015, 11:47 AM

In addition to your report that the noise went away I would like to know from the members what caused this? What could happen to the fan to cause this out of the clear blue ? At least you didn't say anything happened.

Tom B. · 08-01-2015, 12:11 PM

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I bought the car a few months ago and it made the noise right from the start. I don't think anything happened to the fan. I just think that it's not the correct fan for a passenger car.

deuce lover · 08-01-2015, 12:24 PM

Can you post a pic of the fan you have?

JSeery · 08-01-2015, 12:37 PM

Quote:

Originally Posted by Tom B.

I removed the fan and the noise disappeared. Where can I get a correct fan?

I would suggest the same source as other original parts, swap meets, HAMB & Barn for sale and ebay. I have purchased several fan assemblies from ebay.

Tom B. · 08-01-2015, 02:19 PM

The fan blades are at a 45 degree angle

ford38v8 · 08-01-2015, 04:03 PM

Inspect any fans you find, even NOS fans, very closely. Any inconsistency can set up a wobble/vibration that can send a fan blade up through your hood, which coincidentally will crack your intake manifold and chop into your radiator. The only good side of this happenstance is that your insurance will pay for all but the replacement of the fan itself, with no deductible on Comprehensible coverage.

Tom B. · 08-02-2015, 07:26 AM

I've got the pics but figure out how to attach them.

deuce lover · 08-02-2015, 11:15 AM

Tom, Go to your orig post.Click "edit",then click "go advanced".Bring up the page and you will see manage attachments.Click that and a small window opens up .Click on the "brouse" then put the pic in.Click upload ,wait until it or they are uploaded then click close (upper right corner of that window).Click save and you are done.

JSeery · 08-02-2015, 12:05 PM

Be sure the pictures you are trying to upload are within the size limits ~500kB.

deuce lover · 08-02-2015, 12:36 PM

Hard to tell from the pics you posted if the fan has had straightening done to it.Any chance you can borrow a fan to try before you buy another? There might be a Ford V8 club member near you that can help.

Mac VP · 08-02-2015, 03:50 PM

The early generators with the fan mount pulley had a tapered roller bearing at the front of the generator. Without the load of the fan, it might quiet down when spinning......yet still be going bad. A trial with another fan might help narrow this down. New fan and no noise.....you've got a bad fan. New fan and noise remains.....check out the front bearing more closely.

koates · 08-02-2015, 06:27 PM

Hi there, Mac VP is correct here. Your fan looks good and more than likely is not the problem. You could try a few drops of engine oil into the front generator oiler. Otherwise remove and dismantle the generator (note the order the stepped washers and felts are assembled in) and wash out the double tapered roller bearing or if badly pitted on rolling surfaces replace both bearings. Although these bearings are usually just oiled I opt to repack them with high temp wheel bearing grease just like in your front wheel bearings. Then on reassembly adjust the threaded ring against the bearings to remove all end play while allowing the bearings to turn freely. Reassemble generator and refit to engine. Good luck, regards, Kevin.

07-31-2015, 02:24 PM	#1
Tom B. Senior Member Join Date: May 2010 Location: Wautoma Posts: 112	1936 Noisy Fan I'm getting a sound like a low pitched siren from the front of the engine when I rev it up. I took off the fan belt and it went away. Could it be the pitch of the fan blades? Tom B. Last edited by Tom B.; 02-16-2016 at 10:31 AM.

07-31-2015, 02:31 PM	#2
V8COOPMAN Senior Member Join Date: May 2010 Location: East Shore of LAKE HOUSTON Posts: 11,113	Re: 1936 Noisy Fan It could be the fan, but I'd bet it's the generator itself. Assuming a stock set-up, unbolt the fan from the pulley and run the generator to see if the noise still persists....report back. DD __________________ *Click Links Below* __ ▼ *'35-'36 W/8BA & MECHANICAL FAN* *T5 W/TORQUE TUBE*

07-31-2015, 08:32 PM	#3
Kurt in NJ Senior Member Join Date: May 2010 Location: on the Littlefield Posts: 6,159	Re: 1936 Noisy Fan When was the last time you oiled the rear bushing on the generator look at the fan blades while turning ---does it look like they wobble, do any blades have a different angle ---any nicks in the blades there are different pulleys and fans too ,a small pulley will make the fan turn faster, the heavy duty truck fan will make more noise the belt could be worn and slipping

08-01-2015, 11:42 AM	#4
Tom B. Senior Member Join Date: May 2010 Location: Wautoma Posts: 112	Re: 1936 Noisy Fan I removed the fan and the noise disappeared. Where can I get a correct fan?

08-01-2015, 11:47 AM	#5
Joe Immler Senior Member Join Date: Dec 2012 Location: Massillon, Ohio Posts: 783	Re: 1936 Noisy Fan In addition to your report that the noise went away I would like to know from the members what caused this? What could happen to the fan to cause this out of the clear blue ? At least you didn't say anything happened.

08-01-2015, 12:11 PM	#6
Tom B. Senior Member Join Date: May 2010 Location: Wautoma Posts: 112	Re: 1936 Noisy Fan Sponsored Links (Register now to hide all advertisements) I bought the car a few months ago and it made the noise right from the start. I don't think anything happened to the fan. I just think that it's not the correct fan for a passenger car.

08-01-2015, 12:24 PM	#7
deuce lover Senior Member Join Date: May 2010 Location: Southern France Posts: 5,306	Re: 1936 Noisy Fan Can you post a pic of the fan you have?

08-01-2015, 02:19 PM	#9
Tom B. Senior Member Join Date: May 2010 Location: Wautoma Posts: 112	Re: 1936 Noisy Fan The fan blades are at a 45 degree angle

08-01-2015, 04:03 PM	#10
ford38v8 Senior Member Join Date: Jul 2011 Location: SF Bay Area Posts: 6,645	Re: 1936 Noisy Fan Inspect any fans you find, even NOS fans, very closely. Any inconsistency can set up a wobble/vibration that can send a fan blade up through your hood, which coincidentally will crack your intake manifold and chop into your radiator. The only good side of this happenstance is that your insurance will pay for all but the replacement of the fan itself, with no deductible on Comprehensible coverage. __________________ Alan

08-02-2015, 07:26 AM	#11
Tom B. Senior Member Join Date: May 2010 Location: Wautoma Posts: 112	Re: 1936 Noisy Fan I've got the pics but figure out how to attach them.

08-02-2015, 11:15 AM	#12
deuce lover Senior Member Join Date: May 2010 Location: Southern France Posts: 5,306	Re: 1936 Noisy Fan Tom, Go to your orig post.Click "edit",then click "go advanced".Bring up the page and you will see manage attachments.Click that and a small window opens up .Click on the "brouse" then put the pic in.Click upload ,wait until it or they are uploaded then click close (upper right corner of that window).Click save and you are done.

08-02-2015, 12:05 PM	#13
JSeery Member Emeritus Join Date: Nov 2012 Location: Wichita KS Posts: 16,132	Re: 1936 Noisy Fan Be sure the pictures you are trying to upload are within the size limits ~500kB.

08-02-2015, 12:36 PM	#14
deuce lover Senior Member Join Date: May 2010 Location: Southern France Posts: 5,306	Re: 1936 Noisy Fan Hard to tell from the pics you posted if the fan has had straightening done to it.Any chance you can borrow a fan to try before you buy another? There might be a Ford V8 club member near you that can help.

08-02-2015, 03:50 PM	#15
Mac VP Senior Member Join Date: May 2010 Location: Cincinnati, OH Posts: 1,361	Re: 1936 Noisy Fan The early generators with the fan mount pulley had a tapered roller bearing at the front of the generator. Without the load of the fan, it might quiet down when spinning......yet still be going bad. A trial with another fan might help narrow this down. New fan and no noise.....you've got a bad fan. New fan and noise remains.....check out the front bearing more closely. __________________ VANPELT SALES LLC Cincinnati, Ohio Office: 513-724-9486 www.vanpeltsales.com www.classictransmission.com

08-02-2015, 06:27 PM	#16
koates Senior Member Join Date: May 2010 Location: Melbourne Australia. Posts: 2,079	Re: 1936 Noisy Fan Hi there, Mac VP is correct here. Your fan looks good and more than likely is not the problem. You could try a few drops of engine oil into the front generator oiler. Otherwise remove and dismantle the generator (note the order the stepped washers and felts are assembled in) and wash out the double tapered roller bearing or if badly pitted on rolling surfaces replace both bearings. Although these bearings are usually just oiled I opt to repack them with high temp wheel bearing grease just like in your front wheel bearings. Then on reassembly adjust the threaded ring against the bearings to remove all end play while allowing the bearings to turn freely. Reassemble generator and refit to engine. Good luck, regards, Kevin.