Home » Public Forums » GMCnet » Part number for Delco fan clutch for 403
| Part number for Delco fan clutch for 403 [message #302895] |
Thu, 30 June 2016 18:02  |
lw8000
Messages: 201
Registered: July 2012
Location: S.E. Michigan
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Hi all,
I'm trying to locate the Delco part number for the OEM fan clutch on the 403. In the parts book it is GM # 724457. I've seen discussion of different clutches but I'm just looking for the OEM one. I've looked extensively online and don't see any cross reference to this GM #. Anybody have this handy? Thanks, in advance!
--
Chris
Chris S. -
77 Kingsley, 3.70 FD, mostly OEM -
S.E. Michigan
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| Re: [GMCnet] Part number for Delco fan clutch for 403 [message #302900 is a reply to message #302895] |
Fri, 01 July 2016 01:25  |
jimk
Messages: 6734
Registered: July 2006
Location: Belmont, CA
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We have a Delco # that crosses over to the 403.
It might been discontinued, so we end up using a Hayden unit.
On Thu, Jun 30, 2016 at 4:02 PM, Chris S. wrote:
> Hi all,
> I'm trying to locate the Delco part number for the OEM fan clutch on the
> 403. In the parts book it is GM # 724457. I've seen discussion of
> different
> clutches but I'm just looking for the OEM one. I've looked extensively
> online and don't see any cross reference to this GM #. Anybody have this
> handy? Thanks, in advance!
> --
> Chris
> --
> Chris S. -
> 77 Kingsley mostly OEM -
> S.E. Michigan
>
> _______________________________________________
> GMCnet mailing list
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--
Jim Kanomata
Applied/GMC, Fremont,CA
jimk@appliedairfilters.com
http://www.appliedgmc.com
1-800-752-7502
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| Re: Part number for Delco fan clutch for 403 [message #303175 is a reply to message #302895] |
Wed, 06 July 2016 16:55 |
lw8000
Messages: 201
Registered: July 2012
Location: S.E. Michigan
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It just occurred to me that we have the 3.70 final drive and this could affect which clutch is best suited for our application. I was reading some articles today on the fan RPM and engine RPM of various clutches and experiments by Steve Ferguson and others. I don't want to beat a dead horse, but are there any recommendations on which clutch might be best suited, with a 3.70 final drive (higher engine RPMs than the OEM final drive)?
I see previous posts about the Delco 15-4644 being the replacement used by many but it seems to lock in more frequently than others and people are saying it's noisier than the original. With higher engine RPMs I'm wondering if that is the one we should avoid. At this point I'm considering the 15-4208/15-4947 which seems to be the least noisy and I'm assuming with more RPMs that it would be sufficient for cooling. Also based on Ken Burton's research it sounds like that's the best suited for the belts & fan that we have in our coaches.
As always, thanks much for all of the help!
--
Chris
Chris S. -
77 Kingsley, 3.70 FD, mostly OEM -
S.E. Michigan
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| Re: [GMCnet] Part number for Delco fan clutch for 403 [message #303179 is a reply to message #302900] |
Wed, 06 July 2016 18:08 |
lw8000
Messages: 201
Registered: July 2012
Location: S.E. Michigan
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jimk wrote on Fri, 01 July 2016 01:25We have a Delco # that crosses over to the 403.
It might been discontinued, so we end up using a Hayden unit.
Thanks Jim, I just replied to this post as we have your 3.70 final drive (love it). Just wondering if there is a clutch that is better suited for that? Thanks!
Chris S. -
77 Kingsley, 3.70 FD, mostly OEM -
S.E. Michigan
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| Re: [GMCnet] Part number for Delco fan clutch for 403 [message #303195 is a reply to message #303191] |
Wed, 06 July 2016 22:04 |
James Hupy
Messages: 6806
Registered: May 2010
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Considering the reliability, or the lack of it, in the current offering ,
if the one you have works right, no matter what the number, keep it. The
last one I installed, it took three of them before I got a keeper.
Jim Hupy
On Jul 6, 2016 7:56 PM, "Ken Burton" wrote:
> Discussing fan clutches here and asking for recommendations is like
> discussing tire brands. You are going to get several different opinions.
>
> Good luck.
> --
> Ken Burton - N9KB
> 76 Palm Beach
> Hebron, Indiana
>
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| Re: [GMCnet] Part number for Delco fan clutch for 403 [message #303200 is a reply to message #303194] |
Wed, 06 July 2016 23:34 |
jimk
Messages: 6734
Registered: July 2006
Location: Belmont, CA
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Cris,
The gear ratio does not really need to be equated for the fan clutch.
For most application, the medium duty seems to work for most.
Keep in mind, that the cooling system on each coach varies by the condition
of its system.
On Wed, Jul 6, 2016 at 8:03 PM, Billy Massey wrote:
> I get the medium duty from auto zone. Was 922747 last year but they've
> replaced that with 22045, another brand, for this year. It's a never
> ending chase. At least AZ is always right around the corner.
>
> bdub
>
> On Wed, Jul 6, 2016 at 9:55 PM, Ken Burton wrote:
>
>> Discussing fan clutches here and asking for recommendations is like
>> discussing tire brands. You are going to get several different opinions.
>>
>> Good luck.
>> --
>> Ken Burton - N9KB
>> 76 Palm Beach
>> Hebron, Indiana
>>
>> _______________________________________________
>> GMCnet mailing list
>> Unsubscribe or Change List Options:
>> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
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> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
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--
Jim Kanomata
Applied/GMC, Fremont,CA
jimk@appliedairfilters.com
http://www.appliedgmc.com
1-800-752-7502
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Applied/GMC
jimk@appliedairfilters.com
www.appliedgmc.com
1-800-752-7502
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| Re: [GMCnet] Part number for Delco fan clutch for 403 [message #303207 is a reply to message #303195] |
Thu, 07 July 2016 08:31 |
lw8000
Messages: 201
Registered: July 2012
Location: S.E. Michigan
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James Hupy wrote on Wed, 06 July 2016 22:04Considering the reliability, or the lack of it, in the current offering ,
if the one you have works right, no matter what the number, keep it. The
last one I installed, it took three of them before I got a keeper.
Jim Hupy
I wish I could, unfortunately on our last trip, it failed at the very end and the clutch no longer slips hardly at all no matter what the temps. Based on the pics out there I think we have the original clutch in it, so now the task of trying to find the best one to replace it. During the trip it would kick on/off every 15 min or so when it was 88-90 degrees or hotter. Toward the end of the trip all of a sudden the fan kicked in when it was around 80-85 degrees on the highway and then it engaged full time and got louder than it's ever been. At first I thought maybe there was a problem and overheating, but after letting it cool I tried to spin the fan by hand and it has a lot of resistance to it and doesn't spin smooth either.
Chris S. -
77 Kingsley, 3.70 FD, mostly OEM -
S.E. Michigan
[Updated on: Thu, 07 July 2016 08:34] Report message to a moderator |
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| Re: [GMCnet] Part number for Delco fan clutch for 403 [message #303253 is a reply to message #303207] |
Thu, 07 July 2016 20:57 |
Ken Burton
Messages: 10030
Registered: January 2004
Location: Hebron, Indiana
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If that is a Hayden clutch, scrap it and get an AC Delco "heavy" duty one.
If you like noise then get the AC Delco "severe" duty one. I went through 6 Hayden "severe" and "Heavy" duty Hayden clutches in under 2 years, before the Hayden engineers bragged to me that they had lowered the turn on temperature on their entire clutch product line. That lower temperature was what was causing my problem.
I went to the GM (AC Delco) clutch recommended to me by AC Delco Engineering for our coach. The recommended a heavy duty clutch that was matched to the GMC fan pitch and diameter.
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana
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| Re: [GMCnet] Part number for Delco fan clutch for 403 [message #303267 is a reply to message #303253] |
Fri, 08 July 2016 11:44 |
lw8000
Messages: 201
Registered: July 2012
Location: S.E. Michigan
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Ken Burton wrote on Thu, 07 July 2016 20:57If that is a Hayden clutch, scrap it and get an AC Delco "heavy" duty one.
If you like noise then get the AC Delco "severe" duty one. I went through 6 Hayden "severe" and "Heavy" duty Hayden clutches in under 2 years, before the Hayden engineers bragged to me that they had lowered the turn on temperature on their entire clutch product line. That lower temperature was what was causing my problem.
I went to the GM (AC Delco) clutch recommended to me by AC Delco Engineering for our coach. The recommended a heavy duty clutch that was matched to the GMC fan pitch and diameter.
Thanks Ken, I saw your post about that and noted what you found out. I had been trying to cross reference the original GM # directly from the GMC MH parts book, with a local parts shop that I always go to, and they were unable to find it even after calling their Delco resource. They weren't even able to cross reference the 15-4208. I mentioned the 15-4947 that you had mentioned, and they were able to get that one. I have seen multiple complaints about the Hayden ones here as well, so I too will go with the majority on this one. I'll post back our findings. Thanks!
Chris S. -
77 Kingsley, 3.70 FD, mostly OEM -
S.E. Michigan
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| Re: [GMCnet] Part number for Delco fan clutch for 403 [message #303269 is a reply to message #303267] |
Fri, 08 July 2016 12:18 |
emerystora
Messages: 4442
Registered: January 2004
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> On Jul 8, 2016, at 10:44 AM, Chris S. wrote:
>
> Ken Burton wrote on Thu, 07 July 2016 20:57
>> If that is a Hayden clutch, scrap it and get an AC Delco "heavy" duty one.
>>
>> If you like noise then get the AC Delco "severe" duty one. I went through 6 Hayden "severe" and "Heavy" duty Hayden clutches in under 2 years,
>> before the Hayden engineers bragged to me that they had lowered the turn on temperature on their entire clutch product line. That lower temperature
>> was what was causing my problem.
>>
>> I went to the GM (AC Delco) clutch recommended to me by AC Delco Engineering for our coach. The recommended a heavy duty clutch that was matched
>> to the GMC fan pitch and diameter.
>
>
> Thanks Ken, I saw your post about that and noted what you found out. I had been trying to cross reference the original GM # directly from the GMC MH
> parts book, with a local parts shop that I always go to, and they were unable to find it even after calling their Delco resource. They weren't even
> able to cross reference the 15-4208. I mentioned the 15-4947 that you had mentioned, and they were able to get that one. I have seen multiple
> complaints about the Hayden ones here as well, so I too will go with the majority on this one. I'll post back our findings. Thanks!
> --
> Chris S. -
> 77 Kingsley mostly OEM -
> S.E. Michigan
>
You may be able to cross reference them from the original GM part numbers.
550528 prior to 1975
550628 effective with 1975
724457 Transmode prior to serial number 6V10878
550528 Transmode effective with serial number 6V10878
724457 effective with 1977
If you do a Google search for 724457 GM Fan Clutch
you get AC/Delco 15-4694, 15-40508 and 15-40133.
Emery Stora
77 Kingsley
Frederick, CO
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| Re: [GMCnet] Part number for Delco fan clutch for 403 [message #303302 is a reply to message #303267] |
Fri, 08 July 2016 18:52 |
Ken Burton
Messages: 10030
Registered: January 2004
Location: Hebron, Indiana
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Years ago when I was fighting the Hayden problem, and after I finally gave up with them, I contacted AC Delco Engineering. The engineer that I worked with took the GM OEM part number from me plus the measurements that I supplied on the fan. (actually I got the measurements from Denny Allen) He came back with the 15-4208 as the correct replacement clutch. Unfortunately that number is now obsolete and replaced with 15-4947. I have never used the 15-4947, but I do have one spare here that is marked with both 15-4208 and 15-4947 and "made in USA" on the box.
So I have had the 15-4208 on my coach for many years with no problems. I also have the above mentioned spare in case the 15-4208 should ever quit.
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana
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| Re: [GMCnet] Part number for Delco fan clutch for 403 [message #303316 is a reply to message #303194] |
Sat, 09 July 2016 07:14 |
Ray Erspamer
Messages: 1707
Registered: May 2007
Location: Milwaukee Wisconsin
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I went to Autozone yesterday, the 922747 is the HEAVY DUTY clutch and they no longer handle it.
The 22045 mentioned here is actually the SEVERE DUTY clutch which would cross reference to the AZ 922797 or AC Delco 15-4644 or Hayden 2797. I took a picture of the 22045 if anyone is interested.
Ray Erspamer
78 GMC Royale Center Kitchen
403, 3.70 Final Drive
Holley Sniper Quadrajet EFI System,
Holley Hyperspark Ignition System
414-484-9431
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| Re: Part number for Delco fan clutch for 403 [message #304702 is a reply to message #302895] |
Mon, 01 August 2016 15:55 |
lw8000
Messages: 201
Registered: July 2012
Location: S.E. Michigan
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We finally replaced the clutch with the 15-4947. When I was able to take a closer look at our old one, after looking at pics of the 15-4644 it looks exactly like it. The front of the 15-4644 looks thicker than the OEM one so apparently we did NOT have the OEM one the entire time we've had our coach (past 4 years or so). The 15-4947 looks exactly like the pics of the OEM one to me. But, I have not seen an OEM one in person so I'm just basing it on what I could find online. FWIW.
Anyway, after taking it out for a test drive we noticed right away that it is a LOT quieter. Engine temp stayed right where it usually sits on the dash gauge, even though it was only about 80 degrees out at the time. With the old one clutch, we would hear the fan at highway speeds in temps of about 85 and up, and when temps were in the low 90's, the fan would stay on constantly with a low humming noise at highway speeds. We thought it was normal as we did not know otherwise.
Time will tell more as we are able to travel in hotter climates, but thanks for all of the help. I will post any further updates and I plan on posting pics up to the GMC Photos site as well. Also going to keep a spare on board, after seeing the old one fail at the drop of a hat while on the road.
Chris S. -
77 Kingsley, 3.70 FD, mostly OEM -
S.E. Michigan
[Updated on: Mon, 01 August 2016 15:57] Report message to a moderator |
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| Re: Part number for Delco fan clutch for 403 [message #304746 is a reply to message #302895] |
Tue, 02 August 2016 10:10 |
Tilerpep
Messages: 404
Registered: June 2013
Location: Raleigh, NC
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First note, I have a 455, but this thread was relevant as I had fan issues this month with the heat.
I put a clutch in I got at Autozone in March this year. Search 22049 and the picture is the fat body housing, but what arrives when you buy one is #922705, and the body is thin. I tried it, it failed in about a thousand miles.
I came home on a Hayden 2747 I carried as my spare - I took it off two years ago because it runs pretty much all the time. Sure enough, got me home running loudly all the time.
So, as bdub noted above, AZ part numbers and pics have changed/don't match their own inventory. So, the AZ 22045 is the severe duty, fat body, and costs $25 more. Didn't really want severe duty, but they let me put the $30 from the failed clutch on the $55 severe duty as warranty. Have not installed it to see if I like it.
Was at AdvanceAuto this morning, and asked them to cross the 22045 number, they had seven options - only one was listed as Heavy Duty (not regular or severe) under part # 215046, less than $50. Website now says its a CARQUEST part, the store computer showed it as made by Imperial. If I was starting over right now, I would try this one.
Just what I have seen and found, your mileage may vary.
1975 Glenbrook, 1978 Royale rear bath
Raleigh, NC
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| Re: [GMCnet] Part number for Delco fan clutch for 403 [message #304752 is a reply to message #304746] |
Tue, 02 August 2016 12:25 |
Kosier
Messages: 834
Registered: February 2008
Karma: 1
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Just an FYI. I was looking at a Corvette restoration website
(www.pamperedcorvettes.com) who
rebuilds fan clutches for restorers. He says all OEM clutches were made by
Eaton or Schweitzer.
He's a little pricey, but he claims his restorations are indistinguishable
from new only better.
With all the problems with the aftermarket stuff, it might be worth the
extra cost.
Gary Kosier
77PB w/500Cad
Newark, Ohio
--------------------------------------------------
From: "Tyler"
Sent: Tuesday, August 02, 2016 11:10 AM
To:
Subject: Re: [GMCnet] Part number for Delco fan clutch for 403
> First note, I have a 455, but this thread was relevant as I had fan issues
> this month with the heat.
>
> I put a clutch in I got at Autozone in March this year. Search 22049 and
> the picture is the fat body housing, but what arrives when you buy one is
> #922705, and the body is thin. I tried it, it failed in about a thousand
> miles.
>
> I came home on a Hayden 2747 I carried as my spare - I took it off two
> years ago because it runs pretty much all the time. Sure enough, got me
> home
> running loudly all the time.
>
> So, as bdub noted above, AZ part numbers and pics have changed/don't match
> their own inventory. So, the AZ 22045 is the severe duty, fat body, and
> costs $25 more. Didn't really want severe duty, but they let me put the
> $30 from the failed clutch on the $55 severe duty as warranty. Have not
> installed it to see if I like it.
>
> Was at AdvanceAuto this morning, and asked them to cross the 22045 number,
> they had seven options - only one was listed as Heavy Duty (not regular or
> severe) under part # 215046, less than $50. Website now says its a
> CARQUEST part, the store computer showed it as made by Imperial. If I was
> starting
> over right now, I would try this one.
>
> Just what I have seen and found, your mileage may vary.
> --
> 1975 Glenbrook
> Raleigh, NC
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
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