[Supras] Fan clutch question

[Rockey Fox]

After a new aftermarket "Valley" brand fan clutch
failed in less than 20k miles I relubed my stock one
by wiping out the old silicone and replaced with IIRC
3 tubes from Jeff Watson. Mine only roars when it's
cold at start up and quites down within less than 60
seconds. 
I have the replacement "Valley" brand on a shelf
somewhere in the workshop but wouldn't recommend it to
anyone unless you don't mind replacing a "lifetime
warranty" after market unit on a frequent basis...

Rockey 91T

--- Hacker J <jonbhacker at yahoo.com> wrote:

> I rebuilt mine last month.  I drained the oil and
> flushed using DiAqua Silicone oil stripper.
> Hydrocarbon based cleaners will not work on Silicon
> oil, don't waste your time. An alternative is
> to just hang the clutch up by a wire and have it
> drain into a pan. After a day most of it should
> be out. 
> 
> http://www.rpm-technology.com/Digesil/Digesil.htm
>  
> Initially, I was told to use 3 Toyota tubes of
> Silicone oil (3x18mL=54mL).  Afterwards, my fan ran
> all the time... it sounded like an 18 wheeler and
> the fan belt would start shrieking above 4000
> rpm. I figured I had overfilled it, so I pulled it
> apart and removed about 18mL worth of oil, and
> now it works properly. So, for me two tubes seemed
> to about right, but most people said I needed
> three, including Jeff Watson at Champion Toyota. 
> Maybe I just didn't get all the old oil out when
> I flushed it since I did it rather quickly.
> 
> With regards to the big o-ring, it seems to be too
> large on everyone's clutch. For me, with the
> clutch flat on the table, I was able to gently push
> it down into the slot using four hands (with
> the help of my 6 year old assistant :-) and it
> stayed there.  I then plopped the top piece on and
> was good to go.  The screws are tightened to
> 6ft-lbs.
> 
> I have no info on the internal screws, as mine were
> not loose.  I suggest you buy a used clutch on
> one of the forums or on Ebay, and use the parts from
> that to make one good one.
> 
> Jon
> 90T
> 
> 
> 
> 
> 
> > > From: Jeff <jprisco at optonline.net>
> > Subject: [Supras] Fan clutch question
> > Date: Wed, 16 Aug 2006 21:35:57 -0400
> > To: Supras at supras.com
> > 
> > I just pulled my fan clutch - it was completely
> locked up - wouldn't spin free. When I opened it
> > I found 1 of the screws that are in the inside had
> come lose - the ones on the side of the
> > housing with the gear - and was lodged between the
> two plates. The silicon was black also. Turns
> > out that two of the three screws are striped - the
> third on is OK. I took the good screw and
> > screwed into the other two holes and it tightened
> down fine - which leads me to believe that the
> > threads in the housing are OK and all I need is to
> replace the screws.
> > 
> > Anyone know what size?
> > 
> > Can I soak the housing in gas to get all of the
> old silicon out? Tried brake cleaner but there's
> > still a lot left.
> > 
> > When re-assembling - how do you know how much
> silicon to put in - when is it "full"?
> > 
> > Thanks
> > JP
> 
> 
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