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Old 05-27-2021, 04:52 PM   #1
alschnertz
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Default Noisy fan clutch - Aisin brand any good?

1986 745 Turbo, B230FT, M46, 160,000 miles, all stock.

The noise from the engine cooling fan in first & second gear is annoying - even when cold.
I suspect the 35-year old fan clutch is not disengaging at low speeds and when the engine is cold.
It's been this way for years, but I've ignored it since I don't drive it much. The car's not driven in HOT
temps with or without the A/C on anymore.
Still would be nice to fix it though.

I suspect it's the 35-year old fan clutch.
FCP has this one from Aisin as a stock replacement. They say it's a "Tropical Fan Clutch".

https://www.fcpeuro.com/products/vol...opical#reviews

Cooling isn't my issue, it's noise.
Have you used this on a B230FT and was it noisy?
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Last edited by alschnertz; 05-27-2021 at 05:53 PM.. Reason: Spelling - thanks fa182
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Old 05-27-2021, 05:01 PM   #2
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I'm pretty sure Aisin (without the second "a") is / was the the OE supplier of the clutches.
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Old 05-27-2021, 08:43 PM   #3
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OEM as already mentioned is Aisin.
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Last edited by lummert; 05-29-2021 at 07:40 PM..
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Old 05-27-2021, 08:49 PM   #4
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Quote:
Originally Posted by alschnertz View Post
1986 745 Turbo, B230FT, M46, 160,000 miles, all stock.

The noise from the engine cooling fan in first & second gear is annoying - even when cold.
I suspect the 35-year old fan clutch is not disengaging at low speeds and when the engine is cold.
It's been this way for years, but I've ignored it since I don't drive it much. The car's not driven in HOT
temps with or without the A/C on anymore.
Still would be nice to fix it though.

I suspect it's the 35-year old fan clutch.
FCP has this one from Aisin as a stock replacement. They say it's a "Tropical Fan Clutch".

https://www.fcpeuro.com/products/vol...opical#reviews

Cooling isn't my issue, it's noise.
Have you used this on a B230FT and was it noisy?
see for yourself if it spins easy when engine is off
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Old 05-28-2021, 12:13 PM   #5
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Originally Posted by apachechef View Post
see for yourself if it spins easy when engine is off
My experience disagrees with this suggested test. I had the same symptoms as the OP, with fan noise at all times when the engine was running. With engine off, though, the fan turned easily. Replacement of the clutch cured the problem.

But he did not ask for diagnostic advice. He asked about a specific product. I believe that the "tropical" fan clutch is intended for use in hot climates. I doubt that it is necessary in the NE US, but I don't know if there are any disadvantages when compared to the standard version.
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Old 05-28-2021, 12:49 PM   #6
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If you don't want the tropical fan clutch they also have the standard one.

https://www.fcpeuro.com/products/vol...40-760-780-940
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Old 05-28-2021, 05:06 PM   #7
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Quote:
Originally Posted by apachechef View Post
see for yourself if it spins easy when engine is off
Thanks. It does spin when the engine is off, but that's not really what I was inquiring about.
I'm pretty sure the viscus clutch is not working properly.
I was interested in opinions about the Aisin part and if it keeps the fan quiet.

Quote:
Originally Posted by Harry Tuttle View Post
My experience disagrees with this suggested test. I had the same symptoms as the OP, with fan noise at all times when the engine was running. With engine off, though, the fan turned easily. Replacement of the clutch cured the problem.
But he did not ask for diagnostic advice. He asked about a specific product. I believe that the "tropical" fan clutch is intended for use in hot climates. I doubt that it is necessary in the NE US, but I don't know if there are any disadvantages when compared to the standard version.
Thanks for addressing what I asked about. You nailed it with your personal experience and I agree that a "Tropical" clutch is not necessary for my use. I didn't come across the "standard" replacement that Ian noted below on their site for some reason.

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Originally Posted by hiperfauto View Post
If you don't want the tropical fan clutch they also have the standard one.https://www.fcpeuro.com/products/vol...40-760-780-940
Thanks Ian. That's likely what I'll go with.
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Old 05-29-2021, 07:40 PM   #8
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I've been running a tropical fan on my 88 765T in Indiana with no issues.
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Old 06-04-2021, 04:06 PM   #9
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I just bought a GMB fc from Rock Auto, it was shipped face down in a box, no instructions about keeping it vertical for 24hrs etc. But I did it anyway, fingers crossed, it has a little rough spot when turning by hand.
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Old 06-04-2021, 05:47 PM   #10
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This is what I bought from rockauto for $51. It is the tropical clutch.

AISIN FCV002
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Old 06-05-2021, 04:56 PM   #11
alschnertz
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On second thought, I think I'll go with the "Tropical" clutch after all.
I browsed Tasca's site to look at part numbers and saw that the non-tropical clutch referenced above was for B230 without turbo.

FCP's price is fair and includes free shipping.

Thanks again for the help.
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Old 06-05-2021, 10:37 PM   #12
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Keep us updated, please. When my b230ft is running, the fan also spins, always. The fan does pass the engine off spin test though. Thought this was the norm. Please let us know how it works out for you.

Thanks.
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Old 06-05-2021, 10:50 PM   #13
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Quote:
Originally Posted by alschnertz View Post
On second thought, I think I'll go with the "Tropical" clutch after all.
I browsed Tasca's site to look at part numbers and saw that the non-tropical clutch referenced above was for B230 without turbo.

FCP's price is fair and includes free shipping.

Thanks again for the help.
If you get a DOA re-pop, hit me up I've got a couple known good spares.
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Old 06-06-2021, 02:30 PM   #14
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When my b230ft is running, the fan also spins, always.
Yes, they certainly do. Slower at lower temps, more noticeable at higher RPMs. The fan will never not spin when the engine is running.

Sometimes you can hear the difference when slowly revving up the engine when cool. Reaching higher RPMs the rising pitch of the fan whine slows or stops climbing to match. Sometimes you can see this decoupling behavior at the fan blades as well.
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Old 06-06-2021, 03:45 PM   #15
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Originally Posted by tintintin View Post
Yes, they certainly do. Slower at lower temps, more noticeable at higher RPMs. The fan will (never not) always spin when the engine is running. Sometimes you can see this decoupling behavior at the fan blades as well.

Saw an A/C service guy grab the fan while the engine was idling once. He could hold the blade while the engine idled when cold.
Not sure what compelled him to do that.
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Old 07-05-2021, 03:08 PM   #16
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Quote:
Originally Posted by daniels740 View Post
Keep us updated, please.
Follow up...

Installed a new Aisin FCV-002 (Tropical Fan Clutch from FCP) today and all is well.
It's as quiet as it was when I bought it 33 years ago

Thanks for all the comments.
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