Jeep Fan/clutch type
 

Can anyone identify what probable kind of a fan/clutch arrangement I have?  Conditions are:
Cold/not running - blades turn easily by hand.
Hot (220F)/not running - Same.
When hot(220F)/running - tried stopping fan with rolled up newspaper in case it was just coasting, but it chewed the paper -- looked to me like it was being driven with good force.
Jeep, 1987, Wagoneer LTD, 4.0.
Islander.

Re: Jeep Fan/clutch type
 

Do you also have an overheating problem? Replace the clutch. I love your
paper test, but it takes more power to move sufficient air for your cooling
requirements than it does to chew up a newspaper. ;o)

Earle

That is an interesting test with the paper, but
"Islander" <nomail@nomail.net> wrote in message
news:3F2BCF6A.843C3413@nomail.net...
> Can anyone identify what probable kind of a fan/clutch arrangement I have?
> Conditions are:
> Cold/not running - blades turn easily by hand.
> Hot (220F)/not running - Same.
> When hot(220F)/running - tried stopping fan with rolled up newspaper in
case
> it was just coasting, but it chewed the paper -- looked to me like it was
being
> driven with good force.
> Jeep, 1987, Wagoneer LTD, 4.0.
> Islander.

Re: Jeep Fan/clutch type
 

Just a heads up.

You will get more responses if you post in a format everyone can read.
Lots of folks here are on mainframes or just plain don't use windoze so
your HTML posts show up blank or so full of code symbols they are not
readable.

If you change you formatting or composing to 'text only', then everyone
can see it.

I test a fan clutch by heating up the engine good and watching the fan
when someone shuts off the engine. If the fan keeps on spinning after a
hot shutdown, it is toast. It should stop almost immediately.

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's

Islander wrote:
>
> Can anyone identify what probable kind of a fan/clutch arrangement I
> have? Conditions are:
> Cold/not running - blades turn easily by hand.
> Hot (220F)/not running - Same.
> When hot(220F)/running - tried stopping fan with rolled up newspaper
> in case it was just coasting, but it chewed the paper -- looked to me
> like it was being driven with good force.
> Jeep, 1987, Wagoneer LTD, 4.0.
> Islander.

Re: Jeep Fan/clutch type
 

"Mike Romain" <romainm@sympatico.ca> wrote in message
news:3F2BD3F2.F7646F28@sympatico.ca...
> Just a heads up.
>
> You will get more responses if you post in a format everyone can read.
> Lots of folks here are on mainframes or just plain don't use windoze so
> your HTML posts show up blank or so full of code symbols they are not
> readable.
>
> If you change you formatting or composing to 'text only', then everyone
> can see it.
>
> I test a fan clutch by heating up the engine good and watching the fan
> when someone shuts off the engine. If the fan keeps on spinning after a
> hot shutdown, it is toast. It should stop almost immediately.

You can also rely on the "100,000 mile" test and the "ten year" tests. This
is a disposable, maintenance item type of part, not meant to last. Just
replace it if you get suspicious...

Earle

>
> Mike
> 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
> 88 Cherokee 235 BFG AT's
>
> Islander wrote:
> >
> > Can anyone identify what probable kind of a fan/clutch arrangement I
> > have? Conditions are:
> > Cold/not running - blades turn easily by hand.
> > Hot (220F)/not running - Same.
> > When hot(220F)/running - tried stopping fan with rolled up newspaper
> > in case it was just coasting, but it chewed the paper -- looked to me
> > like it was being driven with good force.
> > Jeep, 1987, Wagoneer LTD, 4.0.
> > Islander.

Re: Jeep Fan/clutch type
 

"If you change you formatting or composing to 'text only', then
everyone
can see it."
Thanx for the heads-up & advice.
Islander.

Re: Jeep Fan/clutch type
 

Would the symptoms of a burnt fan clutch include overheating? When I replaced
my fan clutch it seemed like the temp gauge ran slightly lower (maybe a 1/16th
to an 1/8th).
Does anyone have any idea how many MPG a fan clutch actually saves? I'd imagine
Chrysler didn't put it in there for nothing.
-Bill (remove "botizer" to reply via email)

Re: Jeep Fan/clutch type
 

"Wblane" <wblane@aol.combotizer> wrote in message
news:20030808003230.07602.00001127@mb-m14.aol.com...
> Would the symptoms of a burnt fan clutch include overheating? When I

Exactly

> replaced my fan clutch it seemed like the temp gauge ran slightly lower
> (maybe a 1/16th to an 1/8th).
> Does anyone have any idea how many MPG a fan clutch actually saves?

Probably none. I suspect that its main utility is to facilitate faster warm
up of the engine and thus reduce hydrocarbon emissions. A cold engine is a
polluter, and a warm engine is less so. This isn't such a bad deal for the
consumer either. A warm engine experiences less friction than a cold one,
wears out slower, and prevents harmful water build up in the oil. When you
are moving along at highway speed, the fan isn't doing much work anyway.

Earle

> I'd imagine Chrysler didn't put it in there for nothing.
> -Bill (remove "botizer" to reply via email)

Re: Jeep Fan/clutch type
 

On Fri, 8 Aug 2003 05:14:19 UTC "Earle Horton"
<enfermero_diabolico@registerednurses.com> wrote:

> "Wblane" <wblane@aol.combotizer> wrote in message
> news:20030808003230.07602.00001127@mb-m14.aol.com...
> > Would the symptoms of a burnt fan clutch include overheating? When I
>
> Exactly
>
> > replaced my fan clutch it seemed like the temp gauge ran slightly lower
> > (maybe a 1/16th to an 1/8th).
> > Does anyone have any idea how many MPG a fan clutch actually saves?
>
> Probably none. I suspect that its main utility is to facilitate faster warm
> up of the engine and thus reduce hydrocarbon emissions. A cold engine is a
> polluter, and a warm engine is less so. This isn't such a bad deal for the
> consumer either. A warm engine experiences less friction than a cold one,
> wears out slower, and prevents harmful water build up in the oil. When you
> are moving along at highway speed, the fan isn't doing much work anyway.

Earle, you're old enough that you should remember when they started
using the clutched fans. The first one I ever had was on a '57 Ford
and pollution was not an issue. AIR, the original claims for milage
were fairly small but noticable - something on the order of 1-2 mpg
(when gas was $0.25/gal) - but the emphasis was not so much on the
fuel efficiency as on the benefits gained as the higher reving V8's
hit the street. Noise levels were certainly a factor at highway
speeds and that unsightly hole in the hood when a fan let go at high
speed was not insignificant<g>. The use of the clutched fan pretty
well coincided with the increased availability of air conditioning as
well. The fan pitch required to push enough air at low RPM needed to
handle a/c made it impractical to run at high RPM - sounded like a
freight train and had a nasty tendency to either sling blades all over
the place or pull the fan into the radiator. Fuel efficiency gains,
small as they were, became a more significant factor a only when the
gov't started the CAFE program and gas prices started to rise.

--
Will Honea <whonea@codenet.net>