Fan Clutch HELP

G

gary miller

New member
Aug 18, 1998
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I am (trying to) replace the fan clutch on my '77 Kingsley 455. The
notes I have say that the Hayden 2797 is the replacement to use.
HOWEVER, the flange that the clutch bolts to has a 3/4" centering pin
and the Hayden 2797 only has a 5/8" hole. Pound as hard as I can I can't
get the 3/4" pin in the 5/8" hole. Is there another Hayden # or some
other solution???? Thanks in advance.
Gary
'77 Kingsley
North Bend, Oregon Coast (sunshine today -- hope to finish job before
rain!!!!)
 
I have the correct hayden number as 15-4298

>I am (trying to) replace the fan clutch on my '77 Kingsley 455. The
>notes I have say that the Hayden 2797 is the replacement to use.
>HOWEVER, the flange that the clutch bolts to has a 3/4" centering pin
>and the Hayden 2797 only has a 5/8" hole. Pound as hard as I can I can't
>get the 3/4" pin in the 5/8" hole. Is there another Hayden # or some
>other solution???? Thanks in advance.
>Gary
>'77 Kingsley
>North Bend, Oregon Coast (sunshine today -- hope to finish job before
>rain!!!!)
>
>
>
Tom & Marg Warner
Vernon Center NY
1976 palmbeach
 
P O U N D H A R D E R!!! :-) (Sorry, Like Geraldine, the devil made me do
it!)
Dick "The HAMMER" with badly dented 75 PB in Atlanta
PS: Sometimes ya just gotta laugh to keep from cryin'

>

>
>get the 3/4" pin in the 5/8" hole. Is there another Hayden # or some
>other solution???? Thanks in advance.
>Gary
>'77 Kingsley >>
>
>Gary -- I got this info from Don Redd recently about his conversations with
>Jim Bounds.
>
>to O'Reilly Parts and bought the #2705. It only cost like $38.75. Jim said
>that's the right one when I called him back to make sure. >>
>
>Emery Stora
>77 Kingsley
>Santa Fe, NM
>
 
I used one from cinnibar, and it works great. Seems you need lots of air
moving, and the unit they sell is good. I could not find the hayden when I
was shopping.
Al

> I am (trying to) replace the fan clutch on my '77 Kingsley 455. The
> notes I have say that the Hayden 2797 is the replacement to use.
> HOWEVER, the flange that the clutch bolts to has a 3/4" centering pin
> and the Hayden 2797 only has a 5/8" hole. Pound as hard as I can I can't
> get the 3/4" pin in the 5/8" hole. Is there another Hayden # or some
> other solution???? Thanks in advance.
> Gary
> '77 Kingsley
> North Bend, Oregon Coast (sunshine today -- hope to finish job before
> rain!!!!)
 
Emery, Thomas, Richard...
Thanks for your help on the fan clutch. Apparently water pumps have
different size "shafts" which the clutch must slip onto, 5/8" and 3/4".
Many of the part numbers floating around (including the Hayden 2797) have a
5/8" bore. Mine of course has a 3/4" shaft. I called Four Seasons (who
makes Hayden, Napa, and most other brands) and got the NAPA number 771303
which is their heavy duty model and it has a 3/4" bore with a bushing for a
5/8" shaft so all bases are covered.
One more item I can mark off my list!!! Replacing the Sol-Aire is the only
remaining nasty job before paint.
Gary
'77 Kingsley
North Bend, Oregon Coast

> I am (trying to) replace the fan clutch on my '77 Kingsley 455. The
> notes I have say that the Hayden 2797 is the replacement to use.
> HOWEVER, the flange that the clutch bolts to has a 3/4" centering pin
> and the Hayden 2797 only has a 5/8" hole. Pound as hard as I can I can't
> get the 3/4" pin in the 5/8" hole. Is there another Hayden # or some
> other solution???? Thanks in advance.
> Gary
> '77 Kingsley
> North Bend, Oregon Coast (sunshine today -- hope to finish job before
> rain!!!!)
 
- -----Original Message-----
From: Gary Miller
To: gmcmotorhome
Date: April 01, 1999 1:57 PM
Subject: GMC: Fan Clutch HELP


>I am (trying to) replace the fan clutch on my '77 Kingsley 455. The
>notes I have say that the Hayden 2797 is the replacement to use.
>HOWEVER, the flange that the clutch bolts to has a 3/4" centering pin
>and the Hayden 2797 only has a 5/8" hole.

Gary, I have a 78 Royale with the 403 CID engine. I too, saw the GMCnet
thread on using the Hayden #2797 fan clutch, and replaced mine with the
2797. It bolted right on, but it was too much clutch for my fan. It never
went into "quiet" mode. I replaced that one with a Hayden #2747, and it is
similar in operation to my original, but still "roars" at speeds below
45MPH. Apparently, it has a 3/4" dia. hole, because it came with a bushing
that I used to "fill" the gap between my water pump centering pin and the
matching fan clutch hole.

This week I was at Jim Bounds, and he said that the Hayden #2705 was the
number that matched up to the original GMC. I assume he was talking about
my 403CID, and I didn't ask whether the 455CID was the same. My parts book
is not with me, or I would check it for you.

Keep up posted.

Scott Shean
78 Royale
Baton Rouge, LA
 
I too just installed Hayden 2797 on 76 Edgemont w/455 engine
Centering pin on mine was 5/8 and fit perfectly

> In a message dated 4/1/99 4:38:34 PM Central Standard Time, warner

>

> > >I am (trying to) replace the fan clutch on my '77 Kingsley 455. The
> > >notes I have say that the Hayden 2797 is the replacement to use.
> > >HOWEVER, the flange that the clutch bolts to has a 3/4" centering pin
> > >and the Hayden 2797 only has a 5/8" hole.
>
> I just installed the Hayden 2797 and it is correct for the 455 heavy duty - I
> had no such problem, but mine is a '73, which should make no difference.
> Lanier
 
I replaced my 78 Royale, 403 cid engine fan clutch last October with =
the
Hayden 2797. It bolted right on also.

It comes on every time I start the engine and goes off around 35-45 =
mph.
Haven't driven in warm weather yet though.

As an aside, one individual I know, runs a stock Toronado type water =
pump
(with stamped steel vs. cast impeller) on his 455 cid coach engine and =
says
he has no overheating problem. Anyone else try it?? Maybe another =
myth
eliminated???

Paul Bartz

From: Scott Shean [mailto:Scott_Shean]
Sent: Thursday, April 01, 1999 11:58 PM
To: gmcmotorhome
Subject: Re: GMC: Fan Clutch HELP

From: Gary Miller
To: gmcmotorhome =


Date: April 01, 1999 1:57 PM
Subject: GMC: Fan Clutch HELP

I am (trying to) replace the fan clutch on my '77 Kingsley 455. The
notes I have say that the Hayden 2797 is the replacement to use. =
HOWEVER,
the flange that the clutch bolts to has a =BE" centering pin and the =
Hayden
2797 only has a 5/8" hole.

Gary, I have a 78 Royale with the 403 CID engine. I too, saw the =
GMCnet
thread on using the Hayden #2797 fan clutch, and replaced mine with the
2797. It bolted right on, but it was too much clutch for my fan. It =
never
went into "quiet" mode. I replaced that one with a Hayden #2747, and =
it is
similar in operation to my original, but still "roars" at speeds below
45MPH. Apparently, it has a =BE" dia. hole, because it came with a =
bushing
that I used to "fill" the gap between my water pump centering pin and =
the
matching fan clutch hole.
This week I was at Jim Bounds, and he said that the Hayden #2705 was =
the
number that matched up to the original GMC. I assume he was talking =
about
my 403CID, and I didn't ask whether the 455CID was the same. My parts =
book
is not with me, or I would check it for you.
 
> As an aside, one individual I know, runs a stock Toronado
> type water pump(with stamped steel vs. cast impeller) on
> his 455 cid coach engine and says he has no overheating
> problem. Anyone else try it?? Maybe another myth
> eliminated???

I've got no evidence to help slay this myth, just more theory. The larger
the impeller, the more energy it requires. Also, if the impeller is too
large(is capable of moving much more water than the system will flow), then
the water is "churned" and the pump begins to heat the water. I doubt that
the additional heat would be a concern from a cooling standpoint, but it is
wasted energy. Everyone's looking for more horsepower. If these water
pumps have oversize impellers, then maybe here's a source of "free"
horsepower.

Patrick
 
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