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New viscous coupling?

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  • rwtstag
    replied
    Just to add I have had 3 coupling failures in 2yrs, last one last weekend chew the radiator, so dodgy ones still out there.

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  • Ceejay 72
    replied
    Thanks for the explanation DJT!
    Chris

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  • DJT
    replied
    Originally posted by Ceejay 72 View Post
    Thanks for the warnings guys!
    Although I don't quite understand how a seized bearing in the VC would make the fan explode? Wouldn't it just cause the fan to rotate at engine speed? Or am I missing something?
    Thanks,
    Chris
    The viscous coupling is attached to the crankshaft, so it turns at engine speed. However, the fluid inside 'shears' at around 2500rpm, so above that engine speed the fan freewheels. If the coupling is seized, the fan can bend as the speed increases, causing it to contact the radiator with dire consequences. This is even more likely with some of the new replacement fan blades which seem to be more flexible than the original ones.

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  • Ceejay 72
    replied
    Thanks for the warnings guys!
    Although I don't quite understand how a seized bearing in the VC would make the fan explode? Wouldn't it just cause the fan to rotate at engine speed? Or am I missing something?
    Thanks,
    Chris

    Leave a comment:


  • jbuckl
    replied
    Originally posted by new to this View Post

    On my brothers car the viscous failed,so the fan went through the rad and broke the fan
    I had a fan explode due to a viscous bearing seize.
    it took out the battery, radiator, expansion bottle, bottom hose & nearly holed the bonnet!

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  • new to this
    replied
    Originally posted by marshman View Post
    Be careful if retaining a failing viscous coupled fan. It could/will eventually fail all together and could part company causing damage to the radiator and other vulnerable parts. At the very least check there is no "play" in the coupling and it is just a loss of "viscousness" in the coupling.

    Roger
    On my brothers car the viscous failed,so the fan went through the rad and broke the fan

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  • Goldstar
    replied
    Originally posted by mike@thenook View Post
    Chris,

    I'd seek some advice from Peter at LD parts, whatever he sells is tried and tested and he will know the best option.

    Cheers
    Peter doesn’t sell them - draw your own conclusions as to why

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  • marshman
    replied
    Be careful if retaining a failing viscous coupled fan. It could/will eventually fail all together and could part company causing damage to the radiator and other vulnerable parts. At the very least check there is no "play" in the coupling and it is just a loss of "viscousness" in the coupling.

    Roger

    Leave a comment:


  • Ceejay 72
    replied
    Thanks for all the advice guys. I think I'll probably go for the electric fan route, but retain the mechanical fan as well, which works up to a point and has kept the engine at normal temperature except in the hottest recent weather when I was stuck in traffic for 5-10 minutes and the gauge went up to about 3/4.
    Chris

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  • jbuckl
    replied
    There were some NOS holset TKC 101 couplings (mk2) being offered by a member some time back.
    if you get a genuine Land Rover TKC 101 the quality will probably be worth the extra.

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  • DJT
    replied
    I’ve mentioned it before, but I had two brand new TKC101 units fail in quick succession back in 2008-2009. Sourced a new ERC2849 in Land Rover packaging from a Government Surplus site for less than 40 in 2009 and it has done 38,000 miles since then and is still perfect. Best bargain I think I’ve ever bought Stag-wise.

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  • jbuckl
    replied
    There were some NOS holset TKC 101 couplings (mk2) being offered by a member some time back.
    if you get a genuine Land Rover TKC 101 the quality will probably be worth the extra.

    Leave a comment:


  • mole42
    replied
    Originally posted by mike@thenook View Post
    Chris,

    I'd seek some advice from Peter at LD parts, whatever he sells is tried and tested and he will know the best option.

    Cheers
    +1

    Leave a comment:


  • Lingen
    replied
    Chris. I have always believed that an electric fan can be a useful extra for very hot weather, or when towing, but unless it is running continuously, under bonnet temperatures can get very high from reduced airflow. This can cause fuel vapourisation, particularly with ethanol present, and electrics suffer as well.The engine driven fan will always be working to stop this happening.
    There were some poor quality couplings around, but I haven't heard of any failures for some time.
    As for the price difference between the Land Rover offering, and the others, I suspect a lot of it is in keeping with the inflated prices of many of their spares!
    Mike.

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  • Niss
    replied
    EJ Ward don't recommend viscous couplings either. They put an electric fan on when they rebuild an engine.

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