300 TDi Defender Viscous vs electric




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  1. #1
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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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    I would stick to the viscous, I think it's more reliable out in the bundus but maybe that's just me....
    Chris

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    Unless you go for an expensive BMW electric fan, the viscous will be better. Keep it standard and reliable.
    2004 Defender 110 Td5


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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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    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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    Keep the viscous!
    1999 Discovery 1, 300 TDi - "Tink Tanky"

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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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    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.
    Petrus

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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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    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. #11
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    Quote Originally Posted by terratiger View Post
    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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    Thank you hgbosch!

    Think my viscous needs replacing a it is not disengaging anymore..
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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 50į 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.
    LouisXander
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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
    Theo le Roux
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    You can buy it at any hardware store and modify it yourself.
    1999 Discovery 1, 300 TDi - "Tink Tanky"

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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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    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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  18. #18
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    Quote Originally Posted by Werner90 View Post
    got quoted R1500 for labour so decided to do it myself...
    was that an "independant" quote?

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    Quote Originally Posted by Landyluvver View Post
    was that an "independant" quote?
    Maybe
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  20. #20
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    Replaced the viscous, all good again!
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