 | Home > Td5 > Viscous Fan clutch replaceable? Confirmation? |
 
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| geobloke Member Since: 06 Nov 2012 Location: Nottinghamshire Posts: 4410  
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Hey good people. I am 99% certain that the answer is no it is not, but just checking. Is the TD5/TDCI viscous fan centre replaceable (as it was with TDIs), or not?
Cheers...  |
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15th Nov 2023 8:13pm |
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| Mungopark Member Since: 08 May 2017 Location: Wiltshire Posts: 15 
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Out of interest why are you looking to replace ?
My fan seems to engage more often than it used to with no discernible change in the temp gauge (which is pretty inaccurate I know). Is this a sign that the viscous coupling is starting to deteriorate and become more viscous and needs replacing ? I suspect it is the original item and has done 160k miles +. |
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16th Nov 2023 7:48am |
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| excossack Member Since: 22 Feb 2012 Location: North West Posts: 5850 
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Big spanners! 1999 Defender TD5 110 Regards John M0VAZ Econet Station 48 no clock |
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16th Nov 2023 8:14am |
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| geobloke Member Since: 06 Nov 2012 Location: Nottinghamshire Posts: 4410
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Yeah it is. Just had another look whilst fitting the replacement replacement alternator. Seems a bit wasteful not being able to replace the viscous unit to me. Hey-ho. It is off now for the winter, so this is an Easter problem. |
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16th Nov 2023 2:14pm |
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| geobloke Member Since: 06 Nov 2012 Location: Nottinghamshire Posts: 4410
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The traditional method of testing the fan is to stick a rolled up newspaper into the fan whilst it is spinning. It is not for the feint of heart and should only be conducted by a professional. At startup and idle, if done first thing and the paper easily stops then the fan then the viscous clutch is not engaged. If the fan does not easily stop and chews the newspaper up then it is likely the fan is stuck/locked in the engaged position and therefore is not working properly. If done after a good run when the engine is up to temp (and therefore the viscous clutch should engage) and the fan doesn't stop easily then the fan is working as it should do. If however the fan easily stops when the engine is up to temp then the viscous unit is not working. In my case the fan is almost solid all of the time, which is weird as it was working just fine a few months ago. Think I will give the viscous unit a few months to "think about what it wants in life"... It is winter after all. Who needs a fan really. |
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16th Nov 2023 2:26pm |
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| geobloke Member Since: 06 Nov 2012 Location: Nottinghamshire Posts: 4410
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Always have the big spanners on hand  They live in Miffy. |
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16th Nov 2023 2:27pm |
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| excossack Member Since: 22 Feb 2012 Location: North West Posts: 5850
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But skinny spanners to get the viscous fan off. 36mm ? 1999 Defender TD5 110
Regards John M0VAZ Econet Station 48 no clock |
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16th Nov 2023 2:47pm |
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| geobloke Member Since: 06 Nov 2012 Location: Nottinghamshire Posts: 4410
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A pair of spanners on the TD5, one to hold the pulley and one to crack the nut.
Actually they are a superb pair of spanners that have many many uses. I have changed the pulley bearing with them and they work as diff flange spanners too. Mine are Difflock.com items and are now quite modified 
https://www.difflock.com/td5-v8-viscous-fan-tool |
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16th Nov 2023 2:52pm |
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| excossack Member Since: 22 Feb 2012 Location: North West Posts: 5850
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I got a pair, no idea what make but they appeared on the forum for sale and nabbed them 1999 Defender TD5 110
Regards John M0VAZ Econet Station 48 no clock |
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16th Nov 2023 2:53pm |
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| Mungopark Member Since: 08 May 2017 Location: Wiltshire Posts: 15
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Thanks Geobloke, I/authorised newspaper tester will give that a go and see what we can figure out. |
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17th Nov 2023 7:37am |
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| blackwolf Member Since: 03 Nov 2009 Location: South West England Posts: 17443 
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Alternatively with the engine stopped and cold the fan should spin freely, and with the engine stopped and hot it shouldn't.
This approach saves destroying your newspaper and is arguably safer! There again, if you've just bought stuff from Paddocks and it has come packed with 19 identical copies of "The Landy", stuffing them in your fan might be a good way to recycle them!  |
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17th Nov 2023 9:45am |
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| geobloke Member Since: 06 Nov 2012 Location: Nottinghamshire Posts: 4410
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The farm guys love it when I get Paddocks parcels Landys for everyone |
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17th Nov 2023 4:29pm |
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| Jabberwocky Member Since: 27 Oct 2021 Location: Luxembourg Posts: 223 
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I had overheating issues coming back from Albania earlier this year, there’s an absolve killer of a hill in Croatia just north of Zadar and I had to get recovered off it, turned out to be the viscous fan, did the balled up rag test on it at idle and it failed miserably, fortunately I’d taken a spare so could swap it out. Fan seems fine at idle but as soon as you get to a steep hill it throws in the towel and you have issues.
Apparently you can bodge them with cable ties but I will never do a long trip without a spare viscous fan. |
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18th Nov 2023 12:28am |
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| geobloke Member Since: 06 Nov 2012 Location: Nottinghamshire Posts: 4410
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Yup I have seen "fixed" viscous fans before where folks have just decided to have them shifting air all the time. the fix is to stick a number of screws into the housing to lock up the clutch. Not great in the longterm but worth knowing if you are in need of a bush fix.
I am fortunate that the clutch seems to be locked on so if I need it I will pull over and throw it on. |
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18th Nov 2023 4:08pm |
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