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    #16
    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.
    Dave
    1974 Mk2, ZF Auto, 3.45 Diff, Datsun Driveshafts. Stag owner/maintainer since 1989.

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      #17
      Thanks for the explanation DJT!
      Chris

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        #18
        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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