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Thread: urgent td5 head advice please!!!

  1. 1st February 2011, 12:50 PM #31
    jimbob
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    Good news about the cooling system, its not getting over pressurised by the exhaust.

    I also had a thought about the viscus fan. Are they meant to lock up once they are hot or do they just get firmer? Mine only gets slightly firmer than when it is cold.
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  2. 1st February 2011, 01:41 PM #32
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    theres magics inside the viscous fan, don't attempt to decipher how or why they work

    mine doesn't appear to be any different when hot or cold, however i do hear a louder air movement whir when the engine is warmer than normal so assume thats it kicking in.
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  3. 1st February 2011, 03:22 PM #33
    jimbob
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    Quote Originally Posted by Rosscoe68 View Post
    theres magics inside the viscous fan, don't attempt to decipher how or why they work

    .
    Yeah Rosscoe tell me about it, they seem a tad mystical.
    I will stick to the water pump idea first up any way.
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  4. 2nd February 2011, 04:52 PM #34
    jimbob
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    Well a water pump that looks like this does not help things.

    IMG_2897.jpg

    So on the highway now the temp is lucky to go over 88 deg but when you pull up it slowly climbs up.

    I am wondering if the fan is cactus too.

    Is there any one with a td5 and a nanocom that could tell me what temp their engine sits at on idle? I guess to compare apples with apples the ambiant temp would need to be around 40 deg.

    I feel i am getting closer. you beauty.
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  5. 2nd February 2011, 08:07 PM #35
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    at idle mine sits at about 91 to 93 degrees according to nanocom
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  6. 2nd February 2011, 08:20 PM #36
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    Yep. 88-89 on the road moving, pull over and leave idling, and it's around 91-93 same as Rosscoe. Makes no diff' if A/C is on/off.

    2004 D2a Td5
    Kev..

    Going ... going ... almost gone ... GONE !! ... 2004 D2a Td5 Auto "Classic Country" Vienna Green

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  7. 2nd February 2011, 09:21 PM #37
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    Quote Originally Posted by Rosscoe68 View Post
    theres magics inside the viscous fan, don't attempt to decipher how or why they work

    mine doesn't appear to be any different when hot or cold, however i do hear a louder air movement whir when the engine is warmer than normal so assume thats it kicking in.
    It's easy. On the front of the hub is a thermocouple spring that operates a valve plate inside the hub and is attached internally on a bearing of sorts on the hubs main body. The drive shaft bolted to the pump has a matching plate but is fixed to this hubs centre.
    The air temp from the radiator actuates the valve plate to open or close against the hub plate and allows the viscous oil to pass through or be blocked against the valve plate.
    When open or when engine is cool it allows the oil to pass and the fan will free wheel. The hotter the air gets the more the spring will wind up closing the valve plates and blocking oil from flowing causing it to lock up and increase drive to outer hub.

    Initially the fan will lockup when cold as the oil has a high viscosity when cold so resistance causes it to drive the fan.

    See, easy!!!

    Andrew


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  8. 2nd February 2011, 09:24 PM #38
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    Quote Originally Posted by Rosscoe68 View Post
    at idle mine sits at about 91 to 93 degrees according to nanocom


    Mine sits at 83-86!!

    2003 D2a TD5......


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  9. 2nd February 2011, 10:21 PM #39
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    Quote Originally Posted by LOVEMYRANGIE View Post
    It's easy. On the front of the hub is a thermocouple spring that operates a valve plate inside the hub and is attached internally on a bearing of sorts on the hubs main body. The drive shaft bolted to the pump has a matching plate but is fixed to this hubs centre.
    The air temp from the radiator actuates the valve plate to open or close against the hub plate and allows the viscous oil to pass through or be blocked against the valve plate.
    When open or when engine is cool it allows the oil to pass and the fan will free wheel. The hotter the air gets the more the spring will wind up closing the valve plates and blocking oil from flowing causing it to lock up and increase drive to outer hub.

    Initially the fan will lockup when cold as the oil has a high viscosity when cold so resistance causes it to drive the fan.

    See, easy!!! .
    exactly like i said
    all controlled by magics
    its the devil inside i say !!!
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  10. 3rd February 2011, 06:07 AM #40
    jimbob
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    Oh well maybe im just being pedantic then, it only climbs to 92,93 at idle.

    Its just that prior to having these head/over heating problems i never remember it getting up that high, except under extreme conditions.

    But then i surpose sitting idling is not a time when i would have paid great attention to the temp.

    I will give it a couple of days test driving and see how it goes.

    Again thank you to all who helped out with advice and info. It would not have been such an enjoyable job with out it.

    Cheers Jim
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