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Viscous fan drive

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keithj
Posts: 10
Joined: Sun Nov 25, 2018 10:29 pm
Location: Mansfield

Viscous fan drive

Post by keithj » Thu Jan 03, 2019 1:04 pm

I am sure the viscous unit on my fan is not working properly as it spins very freely when the engine is stopped. My local classic car spares shop tells me that getting a replacement will be difficult. Anyone got any suggestions where I might find one? I don't really want to go electric if I can avoid it.

Chris_R
Posts: 374
Joined: Wed Feb 10, 2016 12:48 pm
Location: Twickenham

Re: Viscous fan drive

Post by Chris_R » Thu Jan 03, 2019 1:58 pm

You can test the unit by spinning the fan by hand as hard as you can when the engine is completely cold. If it spins more than 5 times after letting go the clutch has failed. You should also feel some resistance.

keithj
Posts: 10
Joined: Sun Nov 25, 2018 10:29 pm
Location: Mansfield

Re: Viscous fan drive

Post by keithj » Thu Jan 03, 2019 4:51 pm

Yes that was what I thought, there is no resistance and it spins for many more than 5 turns. Any ideas on where to source a replacement?

New Dexter
Posts: 349
Joined: Fri Feb 12, 2016 9:41 am

Re: Viscous fan drive

Post by New Dexter » Thu Jan 03, 2019 6:00 pm

Is it not possible to repair these units? Failing that is there an electric fan conversion available?

Ian Hastings
Posts: 76
Joined: Tue Mar 15, 2016 3:00 pm

Re: Viscous fan drive

Post by Ian Hastings » Fri Jan 04, 2019 10:25 am

The "clutch" is just an oil bath with a disk attached to the fan running in it. I once dismantled a damaged one to see how it worked. I have no idea what type of oil it was, probably hydraulic.

Possibly the oil has leaked out so you may be able to effect a cure by drilling a small hole and injecting some in then seal it up.

User avatar
Alpine Daimler
Posts: 81
Joined: Thu Feb 18, 2016 2:17 pm
Location: Munich

Re: Viscous fan drive

Post by Alpine Daimler » Fri Jan 04, 2019 10:28 am

Hello Keith
Manners do this one on its site for 2.5 V8 Saloon : http://www.jagspares.co.uk/Manners/Part ... C2215AA%23

I hope this one is right as I need one myself!

Rob C
V8, its the only way forward, 1967 2.5 V8 Saloon LHD MAN/OD, DLOC member

keithj
Posts: 10
Joined: Sun Nov 25, 2018 10:29 pm
Location: Mansfield

Re: Viscous fan drive

Post by keithj » Sat Jan 05, 2019 9:24 am

Yes I saw that but discounted it as the model list didn’t include the Daimler V8 but I have just called them and apparently it is the correct one. I have ordered so hopefully it is OK.

Clive
Posts: 13
Joined: Sat May 12, 2018 2:09 am
Location: Phoenix, USA

Re: Viscous fan drive

Post by Clive » Sun Jan 06, 2019 6:23 am

Hi Keith,

It is my belief that it is the same unit as for XJS V12. I got one a few years back from Moss.

There is even a dissection of one shown on jag lover forum: http://www.jag-lovers.org/xj-s/book/FanClutch.htmllive.

Clive.

keithj
Posts: 10
Joined: Sun Nov 25, 2018 10:29 pm
Location: Mansfield

Re: Viscous fan drive

Post by keithj » Wed Jan 09, 2019 12:15 pm

I have now taken delivery of this unit along with the converter bush that is apparently needed. All looks good and no doubt will fit when I get round to it. Thanks again for all the help.

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