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Thread: Viscous engine fan failure?

  1. 13th October 2013, 07:17 AM #1
    CraigH
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    Viscous engine fan failure?

    I have a feeling my engine fan is not engaging like it should. Reason being is my electric fan is running almost all the time even with the A/C off and ambient Temps around 21c.

    Are the viscous clutch on these common/ prone to failure?

    Cheers
    Craig
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  2. 13th October 2013, 12:03 PM #2
    Road Stone Guest
    Hi,

    They are known to fail, but not prone to, just age related.

    To test, with engine off try spinning it with your finger. If it rotates freely with no resistance, then it will need replacing.

    Cheers, Jerry
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  3. 13th October 2013, 01:02 PM #3
    CraigH
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    Yep, it's a bit like that. Turns fairly easy.
    It's going in to my LR mech next week, I'll get him to check it.

    Cheers

    Craig
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  4. 13th October 2013, 01:35 PM #4
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    tangus89
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    try turning it immediately after a drive where it should have been working, if it is still good it should be very hard to turn, if it is the same as when it's cold then its dead.

    cheers
    Tangus

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  5. 13th October 2013, 06:33 PM #5
    CraigH
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    Quote Originally Posted by tangus89 View Post
    try turning it immediately after a drive where it should have been working, if it is still good it should be very hard to turn, if it is the same as when it's cold then its dead.

    cheers
    Tried it.. Look like its knackered...
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  6. 13th October 2013, 07:05 PM #6
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    LandyAndy
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    Grab a handful of strong rag,get a good purchase on it and gently touch the edge of the fan with the engine idling.If the hub is stuffed the fan will stop,if its ok it will try to grab the rag.Take it for a run and repeat with a hot engine,definately shouldnt stop spinning when hot and should try harder to grab the rag.
    Sounds dangerous,as long as you are careful its OK.
    Andrew
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  7. 13th October 2013, 07:54 PM #7
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    brenno
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    Quote Originally Posted by LandyAndy View Post
    Grab a handful of strong rag,get a good purchase on it and gently touch the edge of the fan with the engine idling.If the hub is stuffed the fan will stop,if its ok it will try to grab the rag.Take it for a run and repeat with a hot engine,definately shouldnt stop spinning when hot and should try harder to grab the rag.
    Sounds dangerous,as long as you are careful its OK.
    Andrew
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  8. 14th October 2013, 03:14 PM #8
    CraigH
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    Quote Originally Posted by brenno View Post

    'and that was the day that CraigH changed his forum name to Stumpy'
    Well before that happens, I've had a chat to my LR mechanic. Getting it replaced this week.
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  9. 14th October 2013, 03:39 PM #9
    Hoges
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    Quote Originally Posted by brenno View Post
    'and that was the day that CraigH changed his forum name to Stumpy'
    Yep, neighbour across road raised bonnet of his wife's car while engine running to check for leaks... then proceeded to give the rocker cover a cursory clean... rag got caught and quick as a flash dragged his hand into the fan belt... he is now minus two fingers from the middle knuckle ...
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  10. 14th October 2013, 05:07 PM #10
    slug_burner
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    I'd give the rag idea a miss. If you want to test it yourself use a 50mm paintbrush and try and stop the fan with the bristles. Better still when you have hot weather, idle the engine with the air conditioner on, you should hear the roar of the fan when it engages as the cooling system heats up. Not that you are going to see any sign of the temperature rise on the gauge.
    Quote Originally Posted by benji View Post
    ........

    Maybe we're expecting too much out of what really is a smallish motor allready pushing 2 tonnes. Just because it's a v8 doesn't mean it's powerfull.

    One answer REV IT BABY REV IT!!!
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