Author Topic: Noisy radiator fan gtv6  (Read 1797 times)

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Aussieotto

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Noisy radiator fan gtv6
« on: September 15, 2020, 08:45:09 PM »
Folks ,

Gtv6 1984  , I have a very noisy radiator fan and about to go away for week including some track stuff.
was planning on using another car (it has no roof) , so shit weather means the gtv6 is being pressed into action.
so job that was on the must do that soon now  is should do in next three days.

a, is it possible to service bearing in radator ?
b, given its winter and I have two fans , can I just disconnect noisy one ?
c. Is there a non Melbourne wrecker or shop I could source fans
d. Any where in australia that would sell replacement  or simular

I know this is a last minute desperate question ....

thanks

peter

sportiva

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Re: Noisy radiator fan gtv6
« Reply #1 on: September 16, 2020, 08:14:59 AM »
Hi
Try spraying some lube and see if the noise stops, if so it should be OK for a few days or more. I would check for movement of the fanblade
I had one fail and it ran a ring around the radiator finns. If your fans have the original wiring one fan comes on with the air-con fan switch and both fans come on via the radiator temp sensor. The bearings that the fan armature spins in are a plain bearing they have no balls  ::)  and are shaped a bit like an acorn or an olive. If I can find and old one in my parts stash I will post a photo.

Cheers
   
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sportiva

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Re: Noisy radiator fan gtv6
« Reply #2 on: September 16, 2020, 09:11:10 AM »
 As you can see in this photo the bearing sits in a steel retainer with a felt pad and a spring steel washer. The retainer has tabs that protrude through the motor housing they are then bent over to secure the retainer to the housing
3.0 GTV6 Fiat Free
156JTS

ex
75 2.5
2.0 Alfetta Sportiva #22
1.8 Alfetta
1.2 alfasud
2 75 parted out
15 alfettas parted
10 gtv parted
5 alfasuds parted
156 sele

sportiva

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Re: Noisy radiator fan gtv6
« Reply #3 on: September 16, 2020, 09:27:29 AM »
I will try and answer your questions
a You could remove the armature and relube the felt pads and clean the parts I doubt you will find a replacement bearing.
b You could dissconnect the suspect fan but if you had to sit in city traffic for an extended time the engine temp will go up.
c Mille miglia motors 03 94623119 have plenty of Alfa parts.
d Any auto parts supermarket will have aftermarket fans. https://daviescraig.com.au/category/thermatic-electric-fans

Good luck
« Last Edit: September 16, 2020, 09:30:27 AM by sportiva »
3.0 GTV6 Fiat Free
156JTS

ex
75 2.5
2.0 Alfetta Sportiva #22
1.8 Alfetta
1.2 alfasud
2 75 parted out
15 alfettas parted
10 gtv parted
5 alfasuds parted
156 sele

sportiva

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Re: Noisy radiator fan gtv6
« Reply #4 on: September 16, 2020, 03:38:13 PM »
I want to add some tips for my answer to question a. Pulling the fan motor apart is easy, putting it back together is a little tricky.
When you pull the armature out of the brushes they move out because they are spring loaded pushing the armature back in is hard because there is no way you can push the brushes in easily so I use fishing line to pull the brushes back, then push the armature into the rear bearing then fit the motor housing over the output shaft, holding the armature down as it will be drawn up into the motor housing by the magnets then pull the fishing line out . A picture tells a thousand words so here are 4 pictures or 4k worth of words.
« Last Edit: September 16, 2020, 03:49:09 PM by sportiva »
3.0 GTV6 Fiat Free
156JTS

ex
75 2.5
2.0 Alfetta Sportiva #22
1.8 Alfetta
1.2 alfasud
2 75 parted out
15 alfettas parted
10 gtv parted
5 alfasuds parted
156 sele

John A Pucak

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Re: Noisy radiator fan gtv6
« Reply #5 on: May 11, 2021, 07:45:16 PM »
I pulled both my fans apart and overhauled as best I could. The problem I found was that the bearing bush had dried out and that it wasn't cylindrical anymore and took on an elliptical shape from all the wear. trying to find another sintered bearing that size is near impossible. Best bet is to find another fan where the bearing is not worn out and replace.

bazzbazz

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Re: Noisy radiator fan gtv6
« Reply #6 on: May 11, 2021, 10:05:28 PM »
I want to add some tips for my answer to question a. Pulling the fan motor apart is easy, putting it back together is a little tricky.
When you pull the armature out of the brushes they move out because they are spring loaded pushing the armature back in is hard because there is no way you can push the brushes in easily so I use fishing line to pull the brushes back, then push the armature into the rear bearing then fit the motor housing over the output shaft, holding the armature down as it will be drawn up into the motor housing by the magnets then pull the fishing line out . A picture tells a thousand words so here are 4 pictures or 4k worth of words.

"If necessity is the mother of invention, then surely desperation is the father of it, for I have seen men with a necessity be very clever, yet wondered at how the desperate are driven to be downright bloody brilliant! - Baz   ;)
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GTVeloce

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Re: Noisy radiator fan gtv6
« Reply #7 on: May 12, 2021, 02:04:29 PM »
I have rebuilt a few of these fans and had good success with quieting them down. Haven't had to replace bearings but a clean and lube has down wonders for mild vibrations and noise.

As Sportiva said, the spring-loaded parts are annoying but do-able and be careful not to lose or move any pieces on the blades that might be there for balancing purposes.

bazzbazz

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Re: Noisy radiator fan gtv6
« Reply #8 on: May 12, 2021, 02:41:40 PM »
Surely one must be able to source a suitable Ball Bearing that you could fit from your local bearing supplier?  ???
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