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  #1  
Old 27-09-12, 07:44 AM
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Default 300 TDi Defender Viscous vs electric


I have recently broken a blade on my fan, after some inspection I have an idea that my viscous is also stuck fixed..

So before replacing the lot, can I convert the fan to an electric system to save some engine power?

Inputs would be appreciated..

Thank you

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  #2  
Old 27-09-12, 07:47 AM
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I would stick to the viscous, I think it's more reliable out in the bundus but maybe that's just me....

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  #3  
Old 27-09-12, 08:18 AM
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Unless you go for an expensive BMW electric fan, the viscous will be better. Keep it standard and reliable.

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Old 27-09-12, 11:03 AM
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I've only recently come to understand the viscous fan and how it works... ingenious.

The chaps in the UK are all for pulling them out and replacing with electric.... but they won't find themselves in the middle of nowhere.

I'd also stick to the standard viscous. The 300 Tdi is brilliant for the bundus. Don't start introducing stuff that can become a problem in the sticks.

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Old 27-09-12, 11:49 AM
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If a viscous coupling ever starts slipping in the sticks, two large cable-ties around the shaft and blades will introduce enough friction to get blowing again.
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  #6  
Old 28-09-12, 07:58 PM
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Keep the viscous!

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Old 29-09-12, 03:11 PM
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Quote:
Originally Posted by terratiger View Post
I've only recently come to understand the viscous fan and how it works... ingenious.

The chaps in the UK are all for pulling them out and replacing with electric.... but they won't find themselves in the middle of nowhere.

I'd also stick to the standard viscous. The 300 Tdi is brilliant for the bundus. Don't start introducing stuff that can become a problem in the sticks.
Uk does'nt get as hot as Africa A hot day there does not come close to a hot day here

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Old 29-09-12, 03:15 PM
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Quote:
Originally Posted by terratiger View Post
I've only recently come to understand the viscous fan and how it works... ingenious.

The chaps in the UK are all for pulling them out and replacing with electric.... but they won't find themselves in the middle of nowhere.

I'd also stick to the standard viscous. The 300 Tdi is brilliant for the bundus. Don't start introducing stuff that can become a problem in the sticks.
UK the highest temp is 20 degrees Celsius plus minus keep the viscus fan.

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Old 29-09-12, 04:35 PM
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Quote:
Originally Posted by 4x4 Bedinges View Post
UK the highest temp is 20 degrees Celsius plus minus keep the viscus fan.
You'll be amazed, having lived there for a few years, it can become uncomfortably hot... But yes it is a rare event, point taken


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Old 29-09-12, 05:07 PM
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Hi guys

a properly working viscous fan will only sap power from the engine, when such is running at to high a coolant temperature. As soon as this has returned to normal levels, it will switch off again. It does this by means of a bi-metal triggered valve, that opens or shuts the flow of the viscous fan's oil and therefore engaging and/or disengaging the clutch.

If you need to remove the fan assembly for work on the engine or for cleaning out the intercooler, then ALWAYS stand the fan assembly up right against a wall or similar. This prevents the oil from leaking out of the VF.

You will know that it operates properly when driving off in the morning. You will hear a howling noise from the fan for about 15-20 seconds which then abates. Only once the engine coolant reaches about 97 Degs will the viscous clutch of the fan kick in again and then the fan will suck air through the radiator until such has cooled down to around 85 Degs. At this stage the VC will disengage again.

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  #11  
Old 29-09-12, 05:31 PM
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You'll be amazed, having lived there for a few years, it can become uncomfortably hot... But yes it is a rare event, point taken


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To me uncomfortable comes at 50 in the desert

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  #12  
Old 01-10-12, 06:19 PM
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Thank you hgbosch!

Think my viscous needs replacing a it is not disengaging anymore..

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  #13  
Old 01-10-12, 08:37 PM
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There is nothing wrong with an electric fan conversion. As long as it is properly done it has more advantages of which one is more power..Normal fwd cars also drive in 50° heatwaves and still work fine. I'll go electric with a warning light if you really want to be sure. I'm going electric on my auto Can for the extra 7-9 kw on my auto.

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  #14  
Old 02-10-12, 11:03 AM
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Guys where can one buy the "special" tools refered to in the Rave Manual to enable you to change the Viscous Fan unit.

Cheers

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Old 02-10-12, 11:18 AM
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You can buy it at any hardware store and modify it yourself.

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Old 02-10-12, 09:29 PM
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Quote:
Originally Posted by T le Roux View Post
Guys where can one buy the "special" tools refered to in the Rave Manual to enable you to change the Viscous Fan unit.

Cheers
are you referring to a 32 flat spanner?
may need to thin it down a bit to fit in but easy enough with an angle grinder and flapper wheel

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Old 10-10-12, 07:15 PM
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Bought a 32 spanner and it worked 100%, took me 10 mins to remove and 10 to refit, got quoted R1500 for labour so decided to do it myself...

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Old 10-10-12, 09:40 PM
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Quote:
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got quoted R1500 for labour so decided to do it myself...
was that an "independant" quote?

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Old 10-10-12, 09:42 PM
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Quote:
Originally Posted by Landyluvver View Post
was that an "independant" quote?
Maybe

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Old 18-11-12, 11:01 AM
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Replaced the viscous, all good again!

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  #21  
Old 13-05-14, 08:03 PM
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Default vf removal

Hi guys...

Is there any way of testing the viscus while its off?? And how to tell if its working without running the motor to Temp??
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  #22  
Old 13-05-14, 08:09 PM
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Hi guys...

Is there any way of testing the viscus while its off?? And how to tell if its working without running the motor to Temp??
no
needs to run to operate
if you understand the mechanism, you will realise it operates with centrifugal force so needs to spin to work

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Old 13-05-14, 10:21 PM
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Always interesting reading discussions about fans.
I changed my D2 v8 to electric fans from a Freelander.
In my opinion electric fans will move more air at slow speeds / low motor rpm than a viscous can.
The thing I don't like about the viscous, is you (ok me) only realise it's not working when the gauge moves, by which time it is usually too late.
As mentioned, one can wire in a LED to show the electric fans are running.
Also, you can change the temperature of the switch for when you want them to come on.
My 2c.

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  #24  
Old 15-05-14, 12:07 AM
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Cool stick with the viscous coupling.

I was contemplating the change to an electric fan as well, and saw a lot of talk about it on various websites, mostly from the UK. Most of the guys on the SA site are against it and they turned me off the idea as well. Driving in the UK where a hot day is 25 C, is one thing. Driving in sand, or up long mountain tracks heavily loaded when its 38 to 42 deg C is another. ( any hotter than that you should be having a beer some where cool so you don't overheat ).
The guys report it's not much quieter , or much better fuel economy.
Landrover has done their homework over many years, my viscous fan does the job without fuss for nearly 20 years, hard to beat that for simplicity & reliability. For me that's what it's all about, I doubt if I would notice any noise reduction on a defender anyhow. Thanks for the contributors for sharing their experience about the electric fans, when my time for replacement comes up I'll just get another viscous coupling
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  #25  
Old 15-05-14, 12:24 AM
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Default test viscous coupling.

The coupling works like fluid clutch that has viscous fluid between the plates, the hotter the coupling gets get the more viscous the fluid becomes , and the more drag , ( or drive).
If you heat up the coupling using a hair dryer or hot air gun you should notice it's lot stiffer. When my car is idling and not hot I can grab the fan and hold it for a while, so its just free wheeling and not using hardly any power. I was never brave enough to try it when the engine is hot though.

I guess it works OK because the engine temperature never goes into the red. though it has gone close once or twice, on a long up hill, or in soft sand on hot summer days, with the AC on, I usually turn the AC off when conditions are that bad, My car has no electric fan in front for the AC, that's a small project to think about.
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