Fan test quick question!

[Prey]

Should the fan shread paper with the engine at idle or does it need a few revs on it? I suspect mine is knackered because I can stop the fan easily with my fingers on idle when the car is hot?

[zaust]

If the engine is hot enough for the fan to kick in, It will shread the paper at idel speed, Yes..

If it is stopping in your hand when hot and you have no blood showing, then it has a knackered coupling.

[fuzzy]

sticking your hand in it is a good plan. it worked for me.

http://passionford.com/forum/general-di ... -pics.html

[Prey]

I'd say the temp gauge was sat at just over half when I did it (it seems to sit at 1/2 up to 3/4 all the time tho) on idle I can easily stop the fan with my fingers and it takes a few seconds for it to get going again.

Not sure what temp the fan should 'kick in' tho?

[Prey]

I did try it with a paper first

Hand second!

No blood in my case - but looks like you did a good job!

[Ranchero]

sticking your hand in it is a good plan. it worked for me.

http://passionford.com/forum/general-di ... -pics.html

Is that the prescribed way of testing the fan ?

[fuzzy]

sticking your hand in it is a good plan. it worked for me.

http://passionford.com/forum/general-di ... -pics.html

Is that the proscribed way of testing the fan ?

not if your a soft southern nancy boy. were tougher up here and that poor we cant afford to waste newspapers.

[Prey]

fair play - ouch!

[BadMoonRising]

I was surprised when my teacher at college stuck his hand in my fan and was fine.

He reckons the way to test it is ideally to rev it at 3k or so while not moving. Untill the needle goes in the red and then you will hear the fan kick in.

[Morat]

Your teacher doesn't know much about the m20. A trip into the red can crack the head. Sticking your hand into an electric fan is one (very bad) thing. Sticking it into a fan connected directly to the crankshaft of a 170bhp engine is even worse.

[Prey]

So I take it the fan should be working at 1/2-3/4 on tickover? In which case my fan coupling is well and truly fubared..... Also - does the alternator have a bearing on this, as I know the bushes on mine are sloppy and I have some solid replacements to go on.

[German-Whips]

My fan comes on on startup...... is it meant to do that?

[Morat]

It will spin because the viscous clutch still drags a bit but it won't have the full hand removal potential of a fan with the viscous locked up.