JK CRD, electric or viscous fan?





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  1. #1
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    Default JK CRD, electric or viscous fan?

    Doesvthe CRD have electric or viscous radiator fans?

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    Quote Originally Posted by Dirk View Post
    Doesvthe CRD have electric or viscous radiator fans?
    Good question, let me go open the bonnet and have a look, hang on...

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    It is difficult to see in the garage light and the fan housing is quite restricting too but it looks like a viscous coupling to me?!?

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    Default Torque

    Quote Originally Posted by HeinrichC View Post
    It is difficult to see in the garage light and the fan housing is quite restricting too but it looks like a viscous coupling to me?!?
    Probably Viscous,

    Petrol engines dont have enough torque to drive the wheels and a fan.

    Keith
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    The frogs are starting to notice that the water is getting warm but it is already too hot to do anything about it.....

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    will have to look tomorrow!!

    I'm really embarrassed to say that this is the first vehicle I've owned that I don't have an intimate knowledge of it's internal workings.

    I'd guess it's viscous, it has a huge fan cowling...

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    OK Apoc, next question, how do you get that viscous fitted to a petrol JK?

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    I have to admit the same. But I do remember the sound going with the engine this afternoon so I think it could pretty wel be a engine driven with viscious coupling on the CRD.


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    Quote Originally Posted by Dirk View Post
    OK Apoc, next question, how do you get that viscous fitted to a petrol JK?
    will check out mine tomorrow...

    why on earth do you want a viscous fan? It will stall that V6

    can't be too hard if you REALLY want one...

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    Quote Originally Posted by Apocalypse View Post
    will check out mine tomorrow...
    why on earth do you want a viscous fan? It will stall that V6
    can't be too hard if you REALLY want one...
    http://www.4x4community.co.za/forum/...ad.php?t=81866

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    Default surprised

    Hi,

    Surprised you guys dont know if it is electric or not. Shouldnt you hear an electric kick in and out while idling at a robot etc.

    I made a not so tongue in cheek remark about a petrol not being able to drive a viscous.

    The problem with an engine driven fan is that the fan must be good enough at near idle speeds and yet not draw too much power or self distruct at high RPM.

    Because a Diesel has a very narrow useable RPM range this is easier to achieve. I suspect this may be more difficult to do with an engine with a range of 5-6000RPM.

    Hence going from Viscous to electric may be easy, not sure about the other way round.

    I am talking strictly from logic here, with zero understanding or experience of the two Jeeps involved.

    Keith
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    The frogs are starting to notice that the water is getting warm but it is already too hot to do anything about it.....

  11. #11
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    Good point Keith and it's got me wondering now as well.

    I'm sure you get fans that can handle the RPM's, but I would be careful to fit a fan from a CRD that runs up to 4500rpm and then push it to 6500rpm on the petrol model. A fan coming apart at that RPM will cause a rather interesting mess.

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    Don't now come and spoil a good story with facts!

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    Default mmm

    Quote Originally Posted by Zantus View Post
    Good point Keith and it's got me wondering now as well.

    I'm sure you get fans that can handle the RPM's, but I would be careful to fit a fan from a CRD that runs up to 4500rpm and then push it to 6500rpm on the petrol model. A fan coming apart at that RPM will cause a rather interesting mess.
    Hi,

    My biggest concern would not be coming apart at 6500 but rather that a fan designed for 6500 may not be good enough at 1000 while rock crawling in summer. (Fans pitch)

    Hence the reason why the Petrols appear to have electric fans.

    Keith
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    The frogs are starting to notice that the water is getting warm but it is already too hot to do anything about it.....

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    Just looking at all options to avoid a R35k invoice....

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    6" lift and 35" tyres, keep the fan out of the mud?

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    Good call Apoc; finally justification!! Let's all try it on Swambo and see if it works.
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    Had a good look at the fan last night. If you cover the front grill with a net wouldn't that prevent mud of going into the fan?

  18. #18
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    The CRD has a great big Viscous fan, behind the enormous Radiator and aircon heat exchanger and unfeasibly large intercooler.

    no electric fan at all, which is slightly unusual... but there is no space 'twixt grill and intercooler for one

    Score ANOTHER one for the diesel

    never thought about electric fans having a problem with mud...

    um. as mentioned, changing fans is not entirely straight forward, we run all our specials on HUGE 14" electric fans we get from the states.

    I think the Diesel fan will pull sufficient air through the rad at idle - and it won't have a problem about blowing apart at 6000rpm either...

    Fitting in the cowls and attachments is the issue.

    I haven't really looked at the (spit ) petrol set up so I can't really commment on a solution...

  19. #19
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    A proper viscous fan will not achieve 6500 revs but will slip more as the revs get higher. Viscous should work fine on a petrol as long the engine lines up with the centre of the radiator. All land Rover v8's have a viscous but it will put up the fuel consumption and could drain a fair bit of power, I think mine does.
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  20. #20
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    Apoc the problem is not with electric fans, but the specific one fitted to the JK, which seems to be very prone to water damage.

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