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| munch90 Member Since: 26 Oct 2013 Location: guildford Posts: 3558  
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they will stop quick when first turned
WITH ENGINE OFF spin the fan by hand for a while and it should get easier to spin to the point of it will keeping spinning for a short time when you let go of it that's why fans make a lot more noise when you first start up cold until they free up (normally go quiet after few seconds ) |
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12th May 2014 11:08am |
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| cornish rattler Member Since: 31 Aug 2013 Location: Manchester Posts: 642  
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Are right I see
 Graham
1988 Defender 90 county 200tdi ( Beast ) Paul Walker 1973-2013 ( I Almost Had You ) |
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12th May 2014 5:30pm |
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| g-mack Member Since: 07 Jan 2014 Location: northumberland Posts: 1967
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sorry for hijack, is the 300 tdi fan supposed to spin with engine cold? notice that when starting from cold the V fan constantly spins My 109 thread
my youtube channel |
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13th May 2014 2:08pm |
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| shaggydog Member Since: 12 Aug 2012 Location: Kent Posts: 3347 
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When cold it will spin with some resistance.
On start up it will spin right up to engine speed as the internals of the viscous coupling sort themselves out but after about 5-15 mins should sort itself out and become quite loose. Stop the engine and it should freely rotate if flicked. When the engine is up to running temperature it should click in and start working hard making a more wooshing air sound when you open the bonnet. Once up to temperature with the engine off it should be quite resistant to move and if flicked will probably rotate about 5-90 degrees if spun lightly. this means all is well. If however it spins freely when engine is at running temp, but turned off, means the viscous coupling has failed and a new unit must be sourced. Hope that helps 
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13th May 2014 4:02pm |
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| Retroanaconda Member Since: 04 Jan 2012 Location: Scotland Posts: 2637 
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You have to get them quite hot to have them kick in. Normal driving, especially in the winter months, doesn't manage to lock it up properly on mine.
Put a big trailer on though and it locks up nicely, makes a hell of a racket and really moves a serious amount of air!  |
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13th May 2014 7:35pm |
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| cornish rattler Member Since: 31 Aug 2013 Location: Manchester Posts: 642
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Are that mite explain it then as I drove from wythenshawe to buxton 25 miles with no fan on then put the fan on for going off roading Graham
1988 Defender 90 county 200tdi ( Beast ) Paul Walker 1973-2013 ( I Almost Had You ) |
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13th May 2014 11:12pm |
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