Home » Public Forums » GMCnet » [GMCnet] Squeal >55mph under acceleration... not alternator...
| [GMCnet] Squeal >55mph under acceleration... not alternator... [message #97456] |
Fri, 27 August 2010 08:46  |
gmc gmc
Messages: 69
Registered: May 2009
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Hi all, Mike from Wisconsin here... been a few months... I have 2 issues...
need help/advice on, other is brakes I make another email subject on that
one next...
Ok, winter daughter and I drove to TX. we had squeal, we thought alternator,
anyways bought new Gates belts, and back home had alternator rebuilt, and
still have squeal.
Squeal happens >55mph ONLY under gas, so if I coast or remove foot from gas
pedal the squeal stops!!! Might this be power stearing moter? a bad
bearings? If so is that hard to change? or get rebuilt?
Thanks for your help and guidances...
Mike
78 refurbished :)
Madison, WI
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| Re: [GMCnet] Squeal >55mph under acceleration... not alternator... [message #97472 is a reply to message #97456] |
Fri, 27 August 2010 10:23  |
Bob de Kruyff
Messages: 4260
Registered: January 2004
Location: Chandler, AZ
Karma: 1
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Have you tried revving the motor in neutral to see if it squeels? I still suspect the belts and not just the alternator. If the fan clutch is trying to come on, any of the belts can be suspect. Have you checked the width of the belts to make sure you don't have the narrow ones based on previous threads? There are other things such as A/C compressor bearings that can do that and even though the water pump could, I sort of doubt that one.
Bob de Kruyff
78 Eleganza
Chandler, AZ
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| Re: [GMCnet] Squeal >55mph under acceleration... not alternator... [message #97475 is a reply to message #97474] |
Fri, 27 August 2010 10:42 |
Bob de Kruyff
Messages: 4260
Registered: January 2004
Location: Chandler, AZ
Karma: 1
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""why would it squeel at 55 or greater and then under gas anod stops
immediately when I take foot of pedal???
""
It can be due to inertia of the items the belts are trying to drive. I'm also wondering if it may actually be a whistle caused by a vacuum leak. If you can get it to do that in neutral, I would remove the engine hatch to see if you can tell where about this is coming from.
Bob de Kruyff
78 Eleganza
Chandler, AZ
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| Re: [GMCnet] Squeal >55mph under acceleration... not alternator... [message #97517 is a reply to message #97456] |
Fri, 27 August 2010 15:36 |
Ken Burton
Messages: 10030
Registered: January 2004
Location: Hebron, Indiana
Karma: 10
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| gmc gmc wrote on Fri, 27 August 2010 08:46 |
Hi all, Mike from Wisconsin here... been a few months... I have 2 issues...
need help/advice on, other is brakes I make another email subject on that
one next...
Ok, winter daughter and I drove to TX. we had squeal, we thought alternator,
anyways bought new Gates belts, and back home had alternator rebuilt, and
still have squeal.
Squeal happens >55mph ONLY under gas, so if I coast or remove foot from gas
pedal the squeal stops!!! Might this be power stearing moter? a bad
bearings? If so is that hard to change? or get rebuilt?
Thanks for your help and guidances...
Mike
78 refurbished 
Madison, WI
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Replace the Gates belts. They are too thin. Gates does not make a 7/16" belt any more, they take their 3/8" belt and label it a 7/16" belt. Also do not get NAPA belts. They are also too thin and are made my Gates.
My choices are Goodyear, Kelly-Springfield, or Duralast (made by K-S) K-S and Duralast are available at AutoZone.
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana
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| Re: [GMCnet] Squeal >55mph under acceleration... not alternator... [message #97524 is a reply to message #97517] |
Fri, 27 August 2010 16:13 |
Bob de Kruyff
Messages: 4260
Registered: January 2004
Location: Chandler, AZ
Karma: 1
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Senior Member |
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""Replace the Gates belts. They are too thin. Gates does not make a 7/16" belt any more, they take their 3/8" belt and label it a 7/16" belt. Also do not get NAPA belts. They are also too thin and are made my Gates.
My choices are Goodyear, Kelly-Springfield, or Duralast (made by K-S) K-S and Duralast are available at AutoZone.
--------------------------------------------------------------------------------
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana"'
Ken, I just replaced all my belts with the Duralast. At the time, I was told Autozone no longer sells them under the Kelly brand but that may be a local thing. Regardless, as you say, the Duralast is made by Kelly and the width and fit was just right (as was the price by the way).
Bob de Kruyff
78 Eleganza
Chandler, AZ
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| Re: [GMCnet] Squeal >55mph under acceleration... not alternator... [message #97646 is a reply to message #97524] |
Sat, 28 August 2010 14:00 |
Ken Burton
Messages: 10030
Registered: January 2004
Location: Hebron, Indiana
Karma: 10
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Senior Member |
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| Bob de Kruyff wrote on Fri, 27 August 2010 16:13 |
""Replace the Gates belts. They are too thin. Gates does not make a 7/16" belt any more, they take their 3/8" belt and label it a 7/16" belt. Also do not get NAPA belts. They are also too thin and are made my Gates.
My choices are Goodyear, Kelly-Springfield, or Duralast (made by K-S) K-S and Duralast are available at AutoZone.
--------------------------------------------------------------------------------
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana"'
Ken, I just replaced all my belts with the Duralast. At the time, I was told Autozone no longer sells them under the Kelly brand but that may be a local thing. Regardless, as you say, the Duralast is made by Kelly and the width and fit was just right (as was the price by the way).
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Yes, the Duralast is the same belt with a different cardboard wrapper on it. It even carries the same part number. Our local AZ warehouse / store that supplies all of the others around here has a mixture of K-S and Duralast labeled belts in their stock. I was back in their warehouse about two months ago.
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana
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| Re: [GMCnet] Squeal >55mph under acceleration... not alternator... [message #97647 is a reply to message #97624] |
Sat, 28 August 2010 14:06 |
Ken Burton
Messages: 10030
Registered: January 2004
Location: Hebron, Indiana
Karma: 10
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| philipswanson wrote on Sat, 28 August 2010 10:00 |
Do what I have recommended from the very beginning. When shopping for belts, bring along a 10mm open end wrench to measure belt width. The belt should fit the wrench snuggly. If it doesn't the belts will squeel because they are too thin. I believe Good Year is the only one making the 10mm width. Yes, KS is also a Good Year belt. Gates are garbage, guaranteed to squeel. Also use a chunck of garden hose to listen for the source of the squeel. Make sure all the brackets are in place. I have seen several mechanics leave off the small angled bracket off the back of the alternator. Not rocket science.
Phil Swanson
77GMCPB
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Phil,
Actually on a new (unworn) belt a 10 mm. open end should not fit over the belt. A good new belt is 11 mm wide. I imagine you could try to force 10 mm wrench over a good new belt but it would be a bit of a stuggle.
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana
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| Re: [GMCnet] Squeal >55mph under acceleration... not alternator... [message #97845 is a reply to message #97835] |
Mon, 30 August 2010 19:23 |
gmc gmc
Messages: 69
Registered: May 2009
Karma: 0
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ok drove RV home with NO alternator belt on, only 1/2 mile drive.
New Alt Belt on order! be here Wed.
So maybe other belt is to narrow also? I can replace that also if I can get
it off? and then what part number duralast???
I can report Duralast part number when I get it Wed.
Look forward to a no squeals!!!
thanks
Mike Derr
Madison, WI
On Mon, Aug 30, 2010 at 6:28 PM, gmc gmc <gmc@derr.ws> wrote:
> ok all. was jut at GMC. squeals bad in park at higher idle, pretty high
> ie 55 mph... looked at 2 belts and at that speed they seemed to "egg" out
> a bit!!!!!
>
> Can I take off alternator belt and see if still squeal? what to
> eliminate? but that belt you all say?
>
> can I remove lower belt? that one harder to deal with??? never done that
> one!
>
> thanks all, looking forward to no squeals.
>
> not sure what to do on brakes yet!!!! maybe look at bake ones...
>
> we want to drive it up north this weekend!
>
> anyone in Madison, WI area care to help? I can pay some $
>
> also house battery trey all rusted and has no battery there! I taped ends
> of wires as to not short out! I have to try generator I guess also :)
>
> thanks
>
> Mike Derr
> Madison, WI
> 608-242-7700
>
> 78 GMC
>
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| Re: [GMCnet] Squeal >55mph under acceleration... not alternator... [message #97848 is a reply to message #97845] |
Mon, 30 August 2010 19:33 |
Bob de Kruyff
Messages: 4260
Registered: January 2004
Location: Chandler, AZ
Karma: 1
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""ok drove RV home with NO alternator belt on, only 1/2 mile drive.
New Alt Belt on order! be here Wed.
So maybe other belt is to narrow also? I can replace that also if I can get
it off? and then what part number duralast???
I can report Duralast part number when I get it Wed.
Look forward to a no squeals!!!
thanks
Mike Derr
Madison, WI
""
Mike. I can't recall which engine you have but I would just ask Autozone what belt numbers your model year needs (ask for the equivalent Toronado year (without air pump) . As mentioned, use a 10mm open end wrench and double check the width--it should not slide over the width or top of the belt. Any and all 3 belts can cause a squeel.
Bob de Kruyff
78 Eleganza
Chandler, AZ
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| Re: [GMCnet] Squeal >55mph under acceleration... not alternator... [message #97879 is a reply to message #97859] |
Mon, 30 August 2010 21:28 |
Bob de Kruyff
Messages: 4260
Registered: January 2004
Location: Chandler, AZ
Karma: 1
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Senior Member |
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""ok we matched length for alternator belt.
there are 3??? I see 2 I recall.
How do I get other one off????
thx
oh yeah I have a 305 rebuilt I recall.
""
Mike, what year is your coach? From 1973 thru mid 1977 the engine was a 455 and then from mid 77 thru 1978 the engine was a 403. The belts are different (except for the power steering pump). You should have 3 belts--generator, power steering, and air conditioning. I found the various sources of belt sizes to be inconsistant so just asked for the correct size at Autozone. As far as getting them off, that is a bit too much to describe just on the net here. Do you have a manual? If not, I'm hoping someone in your area can help.
Bob de Kruyff
78 Eleganza
Chandler, AZ
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| Re: [GMCnet] Squeal >55mph under acceleration... not alternator... [message #97894 is a reply to message #97879] |
Tue, 31 August 2010 00:04 |
gmc gmc
Messages: 69
Registered: May 2009
Karma: 0
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Member |
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I have a 1978
I see 2 belts, 3 pullys but one belt never been on maybe!
need to know how to take belt off that is next to the alternator belt???
thanks all
Mike
On Mon, Aug 30, 2010 at 10:28 PM, Bob de Kruyff <NEXT2POOL@aol.com> wrote:
>
>
> ""ok we matched length for alternator belt.
>
> there are 3??? I see 2 I recall.
>
> How do I get other one off????
>
> thx
>
> oh yeah I have a 305 rebuilt I recall.
> ""
>
> Mike, what year is your coach? From 1973 thru mid 1977 the engine was a 455
> and then from mid 77 thru 1978 the engine was a 403. The belts are different
> (except for the power steering pump). You should have 3 belts--generator,
> power steering, and air conditioning. I found the various sources of belt
> sizes to be inconsistant so just asked for the correct size at Autozone. As
> far as getting them off, that is a bit too much to describe just on the net
> here. Do you have a manual? If not, I'm hoping someone in your area can
> help.
> --
> Bob de Kruyff
> 78 Eleganza
> Chandler, AZ
> _______________________________________________
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| Re: [GMCnet] Squeal >55mph under acceleration... not alternator... [message #97899 is a reply to message #97894] |
Tue, 31 August 2010 04:27 |
James Hupy
Messages: 6806
Registered: May 2010
Karma: -62
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More than likely someone removed the AC belt. The one that is not the
alternator belt is the power steering belt. The pump mounting bolts should
all be loosened before any attempt is made to adjust it and make very sure
that you don't pry on the filler neck or the resevoir. There is a slot in
one of the pump holes, and sometimes when you replace the belt, the slot
does not allow enough travel to wrangle the belt over the pulley easily. If
that is the case, take out the bolt in the slotted hole, move the PS pump,
put the belt over the pulley and then replace the bolt. I would also caution
you against putting a belt on the AC compressor and trying to run it without
checking to see if the front bearing in the AC clutch is OK and that the
compressor is free to turn with the clutch engaged. Don't ask how I know
about this. I can still smell the burning rubber from the belt.
Jim Hupy
Salem, Or
78 Royale 403
On Mon, Aug 30, 2010 at 10:04 PM, gmc gmc <gmc@derr.ws> wrote:
> I have a 1978
>
> I see 2 belts, 3 pullys but one belt never been on maybe!
>
> need to know how to take belt off that is next to the alternator belt???
>
> thanks all
>
> Mike
>
> On Mon, Aug 30, 2010 at 10:28 PM, Bob de Kruyff <NEXT2POOL@aol.com> wrote:
>
> >
> >
> > ""ok we matched length for alternator belt.
> >
> > there are 3??? I see 2 I recall.
> >
> > How do I get other one off????
> >
> > thx
> >
> > oh yeah I have a 305 rebuilt I recall.
> > ""
> >
> > Mike, what year is your coach? From 1973 thru mid 1977 the engine was a
> 455
> > and then from mid 77 thru 1978 the engine was a 403. The belts are
> different
> > (except for the power steering pump). You should have 3 belts--generator,
> > power steering, and air conditioning. I found the various sources of belt
> > sizes to be inconsistant so just asked for the correct size at Autozone.
> As
> > far as getting them off, that is a bit too much to describe just on the
> net
> > here. Do you have a manual? If not, I'm hoping someone in your area can
> > help.
> > --
> > Bob de Kruyff
> > 78 Eleganza
> > Chandler, AZ
> > _______________________________________________
> > GMCnet mailing list
> > List Information and Subscription Options:
> > http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
> >
> _______________________________________________
> GMCnet mailing list
> List Information and Subscription Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>
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