[s-cars] Viscous fan clutch failure? - paging Dyno Dave Dawson!

[QSHIPQ at aol.com]

VC clutches on the S cars and V8's are of the whimpy variety.  I doubt  you 
could measure the difference on the dyno with and without it.  The  VC can be 
serviced if you so desire, toyota dealer sells the silicone  fluid in a variety 
of viscosities.  
 
For the big draw (ala my supercharged Landcruiser at Steamboat last year)  
fans, the VC arrangement can suck a lot of power (like 30hp or so), but the fan  
is 20in in diam and 4inches deep.  I bet the S car isn't a 10th of that  draw.
 
There is a special tool that holds the pulley so you can use a big wrench  
(left hand thread) on the pulley nut.  You can modify a lisle crimper for  clamp 
type hoseclamps to replicate this tool.
 
Scott Justusson
 
 
 
 
 
In a message dated 5/11/2007 2:06:07 P.M. Central Standard Time,  
petergolledge at gmail.com writes:

Dave,

Got the clutch off with a "modified" oil filter  wrench.  I drilled out the
rivet and put a longer link and put some  rubber underneath the metal strap.
Removed the fan blade and Hydraulic pump  pulley to get better access.

A new unit is on its way thanks to SJM.  :-)

If that little plastic fan and clutch can sap a huge amount of  power I'd be
surprised... its not driven on the V side of the belt so it  would slip like
crazy with any serious drag on it.

I bought a new  serpentine belt a few weeks back... guess the Car sensed it
and decided I  better do it sooner rather than later. ;-)

_____   

From: djdawson2 at aol.com [mailto:djdawson2 at aol.com] 
Sent: Friday,  May 11, 2007 12:58 PM
To: fastscirocco_2000 at yahoo.com;  StrangConst at rogers.com;
petergolledge at gmail.com;  s-car-list at audifans.com
Subject: Re: [s-cars] Viscous fan clutch failure? -  paging Dyno Dave Dawson!


Sorry, can't provide you with horsepower  loss via the fan clutch.

I can say that if the fan spins that freely,  it is probably shot.  As far as
A/C... if it doesn't work right after  the car is started (from cold), the
clutch isn't the issue.

Removal  varies.  The tough part is holding the pulley.  Some are on there  so
tight that removal in the car is virtually  impossible.

Dave


 



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