A bit of technical help required

[Stevo7682]

Hi guys looking to bounce this problem out there see what ideas people have @t-tony , @Lee you guys input would be appreciated .

So @Scooblitz Stevie was down at mine and after getting him to mix up some cement to help me get my driveway supporting wall built then on to his zed for a couple of the more priority parts to be fitted.

So first job was the 2 rear springs as Stevie's zed had a bit of super low rear suspension .
The lowering springs fitted were really low ( or had sagged) anyway that went fine and 2 new eibach springs in and the rear a lot nicer .

So next on the list is where the issue began.
Since Stevie bought this when he drives it constantly even when cold the viscous cooling fan sounds like its locked on ( sounds like an old Ford cortina or the likes ) so stevie bought a new viscous unit and new fan blades so removed the old one and fitted the new bits .
Still sounds the same like the engine is hot and the viscous unit has locked up and not freewheeling like it should be unless engine hot so when you rev it you got the whoosh noise from the fan .
Any suggestions welcome.

Stephen.

 

[Rudyrov]

Does the fan freewheel when the engine is off? In other words, can you spin it by hand?
The fan works by locking up as the clutch senses heat, at a certain temperature, the clutch engages and the fan spins with authority,

View: https://www.youtube.com/watch?v=UwM4OqsLek4

 

[Lee]

Hi Steve my dads did this. I would normally say the coupling has gone bad on viscous fan. Is the fan itself on the right way round ?

 

[Lee]

Found this on another site.


To confirm the diagnosis, start with this simple test: Spin the fan as hard as you can on an engine that has not been started that day. If the fan rotates more than five times, you can bet the clutch is bad. You should feel some resistance and the fan may spin up to three times, depending on the ambient temperature.

 

[Rudyrov]

Here is a very comprehensive video about how the fan operates and how to test it. I found this to be quite informative and very helpful.
Apparently, viscous fans have lots of resistance at rest when the engine is cold and then the resistance decreases quickly as the fan turns either by hand or by engine power, this is one way to test the coupling. Take a good look at the video.

View: https://www.youtube.com/watch?v=RDuGsDUiXQw

 

[Stevo7682]

The viscous unit i fitted today is brand new

 

[Stevo7682]

Here is a very comprehensive video about how the fan operates and how to test it. I found this to be quite informative and very helpful.
Apparently, viscous fans have lots of resistance at rest when the engine is cold and then the resistance decreases quickly as the fan turns either by hand or by engine power, this is one way to test the coupling. Take a good look at the video.

View: https://www.youtube.com/watch?v=RDuGsDUiXQw

Symptoms are like he describes failure 4 the bearing seized and it no longer a viscous fan fan turns engine speed and noisy.
Thats why changed it all but new viscous unit and fan blades doing same .
@Lee fan appeared to only fit correctly one way round but at lakes this coming weekend will try take a look at a couple of the 2.8's that are going see if anything looks obviously different.