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waterpump fan question 200 1983

posted by  Breadman on  Sun Nov 10 11:51 CST 2002
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last visit: Wed Apr 18 04:46 CST 2012
[RELATED]

With the engine off, should the plastic fan be able to spin freely?
--
'83 244GL 210K








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support you local boneyard, go electric! [nmi] 200 1983

posted by  someone claiming to be rouleur on  Mon Nov 11 00:45 CST 2002 [RELATED]








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waterpump fan question 200 1983

posted by  oty on  Sun Nov 10 12:23 CST 2002
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With the engine off should the fan freewheel?

Yes, if it did not freewheel, the fan's clutch would be inop. The fan speed is not directly controlled by the crankshaft drive belt, instead the belt supplies power that is administered by the fan's viscous drive clutch, which in turn is regulated by the engine's compartmental temperature.

When you start a cold engine the fan does not need to provide cooling airflow so the fan's clutch does not lock-up with O2 pump speed. When the compartmental temp increases the fan's viscous or variable clutch engages from low rpm to a higher rpm as required by the compartmental temperature.

In fact, a rogue method of checking the clutch operation is to hold the blade and have someone crank the engine (pull the fuel CB next to the BATT before you attempt this), however be forewarned, should the fan clutch be defective your hand may take one hell of a beating. This should go without saying, but don't try this technique with a warm engine.








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waterpump fan question 200 1983

posted by  someone claiming to be TomD on  Sun Nov 10 15:09 CST 2002 [RELATED]

oty,

Good advice, but you meant to say H2O (not O2) for Water...

Regards,

TomD
'86 240
'93 240







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