| [GMCnet] S-10/Blazer Fan Clutch [message #74103] |
Tue, 16 February 2010 22:23  |
Ken Henderson
Messages: 8726
Registered: March 2004
Location: Americus, GA
Karma: 9
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Senior Member |
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Does anyone know how to remove the darned fan clutch from a '99 S-10/Blazer?
At the junkyard today I wanted to remove the CS-130D alternator and its
cast aluminum bracket. One of the fasteners was a stud which was long
enough that the bracket wouldn't come off with the fan installed and I had
no way to remove the stud. So I tried to remove the fan. But it's bolted
to the back of the fan clutch. OK, so I'll remove the fan clutch, by
removing the 4 bolts holding the pulley & clutch to the WP flange. Nope --
those 4 bolts secure only the pulley. There's a big hex shaft between the
WP flange and the back side of the fan clutch with no obvious way to
disconnect the two. Certainly can't hold the hex and back the clutch off
because the clutch slips.
I finally got the alternator and bracket off by removing the stud from the
back side of the loosened bracket with long lock-grips. But the fan is a
nice 19" molded plastic unit that I'd like to try on the Cad 500 if I could
get it off.
Another S-10/Blazer removal problem: The PS pump. Anyone got any idea how
to do that? I removed the 3 bolts I could find and it still wouldn't move
-- and MAN, those 2 behind the pulley (with no removal hole in it) are a
bear to remove with an end wrency. It the front fenders had been on the car
I wouldn't have attempted it.
My impression is that vehicle's designed only for ease of production line
assembly, with little thought to serviceability (sorta like my '91 S-10).
I'm going to have to go back to the junk yard before the Cad 500
installation can be completed; any help with those items will be
appreciated.
Ken H.
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Ken Henderson
Americus, GA
www.gmcwipersetc.com
Large Wiring Diagrams
76 X-Birchaven
76 X-Palm Beach
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| Re: [GMCnet] S-10/Blazer Fan Clutch [message #74115 is a reply to message #74103] |
Wed, 17 February 2010 00:45  |
Ken Burton
Messages: 10030
Registered: January 2004
Location: Hebron, Indiana
Karma: 10
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Senior Member |
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| Ken Henderson wrote on Tue, 16 February 2010 22:23 |
Does anyone know how to remove the darned fan clutch from a '99 S-10/Blazer?
At the junkyard today I wanted to remove the CS-130D alternator and its
cast aluminum bracket. One of the fasteners was a stud which was long
enough that the bracket wouldn't come off with the fan installed and I had
no way to remove the stud. So I tried to remove the fan. But it's bolted
to the back of the fan clutch. OK, so I'll remove the fan clutch, by
removing the 4 bolts holding the pulley & clutch to the WP flange. Nope --
those 4 bolts secure only the pulley. There's a big hex shaft between the
WP flange and the back side of the fan clutch with no obvious way to
disconnect the two. Certainly can't hold the hex and back the clutch off
because the clutch slips.
I finally got the alternator and bracket off by removing the stud from the
back side of the loosened bracket with long lock-grips. But the fan is a
nice 19" molded plastic unit that I'd like to try on the Cad 500 if I could
get it off.
Another S-10/Blazer removal problem: The PS pump. Anyone got any idea how
to do that? I removed the 3 bolts I could find and it still wouldn't move
-- and MAN, those 2 behind the pulley (with no removal hole in it) are a
bear to remove with an end wrency. It the front fenders had been on the car
I wouldn't have attempted it.
My impression is that vehicle's designed only for ease of production line
assembly, with little thought to serviceability (sorta like my '91 S-10).
I'm going to have to go back to the junk yard before the Cad 500
installation can be completed; any help with those items will be
appreciated.
Ken H.
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I remove mine all the time but I do it with a muffler gun. Put a blunt tip in the gun place it slightly off center of the big hex nut. A short one or two second burst will spin it loose enough that you can simply spin if off.
Now how to do it with hand tools in a junk yard is a good question. You might get enough air to run a few short bursts with a muffler gun with a carry in air tank.
That big hex nut just spins on from the front. You do not even need to tighten is as it self tightens when you start the engine.
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana
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| Re: [GMCnet] S-10/Blazer Fan Clutch [message #74117 is a reply to message #74103] |
Wed, 17 February 2010 02:09 |
GMC Cruse
Messages: 606
Registered: June 2009
Location: SE Michigan
Karma: 3
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Senior Member |
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For the power steering pump, on my '95 Sonoma, I had to remove the pump pulley to get at those bolts. That's how the manual said to do it and I thought there must be a way to do it without removing the pulley but couldn't find one. I ended up going to Harbor Freight and buying a pump pulley puller and installer.
On the '95, removing the bolts in the water pump flange removed the fan clutch and blades. They must have made a change in later years.
Mike K.
'75 PB
Southeast Michigan
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| Re: [GMCnet] S-10/Blazer Fan Clutch [message #74123 is a reply to message #74103] |
Wed, 17 February 2010 03:33 |
Steven Ferguson
Messages: 3447
Registered: May 2006
Karma: 0
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Senior Member |
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Ken,
You need to listen to one of those before you try it. Just about the
noisiest fan I've ever heard. What's wrong with the standard GMC fan?
Or even the stock Caddy blade?
On Tue, Feb 16, 2010 at 9:23 PM, Ken Henderson <hend4800@bellsouth.net> wrote:
> Does anyone know how to remove the darned fan clutch from a '99 S-10/Blazer?
> At the junkyard today I wanted to remove the CS-130D alternator and its
> cast aluminum bracket. One of the fasteners was a stud which was long
> enough that the bracket wouldn't come off with the fan installed and I had
> no way to remove the stud. So I tried to remove the fan. But it's bolted
> to the back of the fan clutch. OK, so I'll remove the fan clutch, by
> removing the 4 bolts holding the pulley & clutch to the WP flange. Nope --
> those 4 bolts secure only the pulley. There's a big hex shaft between the
> WP flange and the back side of the fan clutch with no obvious way to
> disconnect the two. Certainly can't hold the hex and back the clutch off
> because the clutch slips.
>
> I finally got the alternator and bracket off by removing the stud from the
> back side of the loosened bracket with long lock-grips. But the fan is a
> nice 19" molded plastic unit that I'd like to try on the Cad 500 if I could
> get it off.
>
> Another S-10/Blazer removal problem: The PS pump. Anyone got any idea how
> to do that? I removed the 3 bolts I could find and it still wouldn't move
> -- and MAN, those 2 behind the pulley (with no removal hole in it) are a
> bear to remove with an end wrency. It the front fenders had been on the car
> I wouldn't have attempted it.
>
> My impression is that vehicle's designed only for ease of production line
> assembly, with little thought to serviceability (sorta like my '91 S-10).
>
> I'm going to have to go back to the junk yard before the Cad 500
> installation can be completed; any help with those items will be
> appreciated.
>
> Ken H.
> _______________________________________________
> GMCnet mailing list
> List Information and Subscription Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>
--
Steve Ferguson
'76 EII
Sierra Vista, AZ
Urethane bushing source
www.bdub.net/ferguson/
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| Re: [GMCnet] S-10/Blazer Fan Clutch [message #74126 is a reply to message #74118] |
Wed, 17 February 2010 05:38 |
Ken Burton
Messages: 10030
Registered: January 2004
Location: Hebron, Indiana
Karma: 10
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Senior Member |
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| GMCWiperMan wrote on Wed, 17 February 2010 02:26 |
Ken,
Is the hex nut attached to the clutch or the WP? RH threads? Or LH? My
brain ain't calculatin' that motor spinnin' thing at this time of night,
especially when I'm up correcting hypoglycemia. Maybe a big, long wrench,
given a sharp blow with a hammer would loosen it? Your removing it "all the
time" makes yours a lot easier than one that's been on there 10 years. 
Ken H.
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The big nut is part of the fan clutch. Standing in front of the engine turn the nut counter clockwise. I have had mine off of my 98 Blazer several times in 174,000 miles. Including one time that I replaced the my water pump. My daughter has had hers off her 96 several times including when she replaced the engine. Hers had around 280,000 miles the last time I checked. I do not remember taking the one off of Laurie's 99 Jimmy, but I always do it with the impact of the air driven muffler gun.
Doing it with hand tools with the belt off I do not know how you would hold the pulley while trying to turn the big nut. I thought I had a spare fan and clutch laying around. I just looked in the garage and basement and could not find it. Sorry
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana
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| Re: [GMCnet] S-10/Blazer Fan Clutch [message #74127 is a reply to message #74126] |
Wed, 17 February 2010 05:58 |
Ken Burton
Messages: 10030
Registered: January 2004
Location: Hebron, Indiana
Karma: 10
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Senior Member |
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I just looked at Laurie's to refresh my memory. That big nut is the indeed part of the fan clutch. The nut is part of the rear shaft going into the clutch.
I'm still saying to take an air tank with 120 PSI of air, and a muffler gun to the junk yard. You will be surprised how easily it will come off. Position the nut so it is flat across the top. Then place the muffler gun on the left side of the flat surface of the nut. Squeeze the trigger and the nut will turn. Then simply spin the fan and clutch, as one assembled piece, off of the front of the water pump by hand. The nut is a fine thread and it will spin off by hand easily once you get the nut to turn.
I have no idea on the PS pump. I have never pulled one on a Blazer. I have pulled on an S-10 with a 2.8 v6. It was a pain to get the the bolts or nuts off. It is much easier if you pull the pulley off of the pump. I do not know if the Blazer 4.3 is the same.
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana
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| Re: [GMCnet] S-10/Blazer Fan Clutch [message #74131 is a reply to message #74123] |
Wed, 17 February 2010 07:32 |
GMCWiperMan
Messages: 1248
Registered: December 2007
Karma: 1
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Senior Member |
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Steve,
On that note, I'll forget trying to figure out how to remove it. I don't
HAVE a stock GMC fan; nor a Cadillac. The fan on the 455 bass ackards
because of my serpentine belt; the fan's the only accessory I didn't get
with the Cad. And the one thing I didn't get at the junkyard yesterday.
I sure appreciate you telling me it's noisy; I was hoping for quieter.
Ken H.
On Wed, Feb 17, 2010 at 4:33 AM, Steven Ferguson <botiemad11@gmail.com>wrote:
> Ken,
> You need to listen to one of those before you try it. Just about the
> noisiest fan I've ever heard. What's wrong with the standard GMC fan?
> Or even the stock Caddy blade?
>
> On Tue, Feb 16, 2010 at 9:23 PM, Ken Henderson <hend4800@bellsouth.net>
> wrote:
> > Does anyone know how to remove the darned fan clutch from a '99
> S-10/Blazer?
>
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| Re: [GMCnet] S-10/Blazer Fan Clutch [message #74132 is a reply to message #74127] |
Wed, 17 February 2010 07:35 |
GMCWiperMan
Messages: 1248
Registered: December 2007
Karma: 1
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Senior Member |
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Thanks, Ken. Per my note to Steve, I'll abandon that idea. It was
obviously going to put more unwanted decisions and machining tasks on my
plate anyway.
Ken H.
On Wed, Feb 17, 2010 at 6:58 AM, Ken Burton <n9cv@comcast.net> wrote:
>
>
> I just looked at Laurie's to refresh my memory. That big nut is the indeed
> part of the fan clutch. The nut is part of the rear shaft going into the
> clutch...
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