jwhitton Posted April 23, 2019 Share Posted April 23, 2019 (edited) Defender 90 300Tdi While performing some other work, I removed the fan and viscous coupling assembly. I put the assembly on a box with the bolt threads facing downwards. A few days later when I re-attached the fan and coupling, there was what looks like thin silicone grease / vaseline on the box, and appears to have "bled" from the viscous coupling. The thick fluid is clear and has no smell. Just wanting confirmation this is so, and probably assume I need a new viscous coupling? Edited April 23, 2019 by jwhitton Quote Link to comment Share on other sites More sharing options...
Escape Posted April 24, 2019 Share Posted April 24, 2019 Never heard of one leaking, but have been told to store upright to prevent the viscous fluid moving to one side. Quote Link to comment Share on other sites More sharing options...
jwhitton Posted April 24, 2019 Author Share Posted April 24, 2019 Thanks, yes don't store on the thread side horizontally. I don't think its making much noise, so will run it longer to see how it gets on. Quote Link to comment Share on other sites More sharing options...
David Sparkes Posted April 24, 2019 Share Posted April 24, 2019 My experience of fan viscous couplings is that if they leak in service the blades get a film of dirt, which wipes off easily by finger pressure, so is easily checked. As the leak becomes more extreme a line of dirt appears on the underside of the bonnet, above the fan; unless the fan is inside a cowl, when it's the inside of the cowl that becomes covered in greasy dirt. I now regard all fan VCs as service items. The service interval may be 'long', but it's an item that falls into the catagory of 'check and replace if required'. I now feel that If it gets to the stage of being mechanically noisey the the check interval has been much, much, too large. My first did that, and started my learning process. Subsequent examples, on different vehicles, taught me about 'greasy dirt clues', as well as lack of cooling becoming noticable. Regards Quote Link to comment Share on other sites More sharing options...
jwhitton Posted April 24, 2019 Author Share Posted April 24, 2019 Thanks David, it now appears the leak has stopped once the fan is installed and back in the vertical position. I will continue to monitor as suggested. Quote Link to comment Share on other sites More sharing options...
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