Vehicle & Technical > Discovery

V8 Viscous Fan

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andrew2986:
Steve,
A mate of mine had the same prob and wound some string into the viscus coupling to jam it up, bit of a bodge but it worked

Andy

Range Rover Blues:
Usually they are left hand thread but on the serpentine V8 they are right hand, the nut is bigger and obviously the blade run the other way.  It runs off the back side of the belt which is the clue.

You could try wrapping some hefty string round the back of the nut to jam it up for a few days but if it's going into the red you could have a problem.  I ended up swapping both my rad and viscous hub (got the pair for £200) when the LSE was getting a bit hot.

SteveGoodz:
Cheers guys, I'm at home tomorrow so will see what I can do.

Did quite a distance on the motorway today - lower ambient temperatures and fairly constant high(ish) speed - with absolutely no problem  :dance:

Might have a ring around a couple of scrappies and see what I can find.

Range Rover Blues:
Shame you aren't closer.

You might findone of something similar will fit but whether it will run at the right speed I can't say.  They are a common thread though.

SteveGoodz:
Okay, I'm having second thoughts on the viscous coupling ... having removed the cowl from around the fan this afternoon I see that the viscous unit looks pretty new. Still shiny - hardly condusive with 10+ years of use. My initial comment about freewheeling may have been a bit off. At normal engine temperature I can turn the fan quite easily but there is some resistance to and when cold it certainly turns more freely.

I experienced overheating again today. Dropped the wife off to visit her mother in hospital about 5 miles from home. Temp was fine until I got about 1 mile from home when it started to increase and by the time I'd stopped outside the garage there was steam pouring out from every orifice around the bonnet and the headlamps. Popped the bonnet and water is boiling/bubbling out from the expansion bottle cap  :oops: Speed was never more than 40mph during the journey and the ambient was pretty cool. I didn't get stuck in traffic either.

A couple of hours later I drove back to the hospital to collect SWMBO (after putting about 1.5ltrs of water in) and it was fine both ways - never went above normal  :?

So, I'm thinking what can cause this kind of problem :-k Do we have any V8 cooling system guru's here?

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