I thought a Micro Cat was a "D 0.05"
http://www.kjmachinerysales.com.au/i...ozer-D9sml.jpg
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I thought a Micro Cat was a "D 0.05"
http://www.kjmachinerysales.com.au/i...ozer-D9sml.jpg
Mine has had it removed and a fixed fan added. My understanding is that as the engine heats up (excessively) the fluid in the viscous coupling "locks" or thickens so the fan starts to actually drive and pull air through the radiator. When not hot the fan just free wheels saving a little power, fuel and noise. When the viscous fails it free wheels even when the engine gets hot and does not pull air through.
With a fixed fan, it is operating all the time pulling air through (a plus) but for most of the driving we do a fan is not actually needed as the air flow through the radiator is enough (exceptions - traffic, 4wding, sand etc). So to drive a fixed fan energy is required from the engine and it can be noisy.
Garry
Long shaft usually means the shaft is longer tham normal and is of soft metal so it can be cut or easily machined to suit various different models in that vehicle/ engine range.
From my own experience and other information I have the 101 visous coupling usually fails locked up.
I replaced mine and it made alot of difference to cabin engine noise and a slight decrease in fuel burn.