Serpentine belt squeaks at startup. Saginaw, 3G alt... Hate to do this - Ford Bronco Forum
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post #1 of 35 (permalink) Old 03-15-2017, 09:48 PM Thread Starter
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Serpentine belt squeaks at startup. Saginaw, 3G alt... Hate to do this

Been discussed to death I am sure. I have also done these mods on my first Bronco.

But, now, for the life of me. I can't figure out what belt to run on my 92 5.8 Bronco after installing a 3G and Saginaw pump. Both have been tested for bad bearings and such. Along with smog pump and water pump.

I get a nice squeal at startup when I put on a new belt. Before, I had a squeal, and then a light low squealing when driving. And, at idle.

Not sure what size belt to get. The OE is about 93". Too small now. I now have a 95.236" on there now. I am not sure if the belt is too long or small?

My tensioner looks be in range. I have a pic for reference.







I know this has been talked about in here from time to time. I just have too much going on to get dirty in here. I do apologize.

Any info appreciated.

1992 XLT, 5.8 w/ E40D transmission, TTB D44 in front, 8.8 rear, 4.88 gears w/ Eaton Posi, Gibson exhaust/headers,cb radio, 4" suspension lift, 33x12.5's on 8" Pro Comp wheels.

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post #2 of 35 (permalink) Old 03-15-2017, 09:52 PM
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didn't the 92 come with a 3g?

regardless, i have a 96 which definitely has the 3g and i have a sag pump. i used the belt from a 96 e-150, 351w, with A/C.

goodyear 4061025/6pk2605

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post #3 of 35 (permalink) Old 03-15-2017, 10:04 PM
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Are you sure its the belt? I was fighting what I thought was a belt squeak and have the same set up as you. Ended up being the distributor that was the culprit , worn bushings I guess

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post #4 of 35 (permalink) Old 03-15-2017, 11:48 PM
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Quote:
Originally Posted by JScatt View Post
Are you sure its the belt? I was fighting what I thought was a belt squeak and have the same set up as you. Ended up being the distributor that was the culprit , worn bushings I guess
Forgive my ignorance, but the distributor was causing a squeak? How's that?

I've got a slight belt chirp at startup, 130amp alternator, sag pump, running a K061037 belt (103.7 ID, 104.25 OD).

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post #5 of 35 (permalink) Old 03-16-2017, 05:16 AM
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The Saginaw and higher output 3G are increasing the load on the belt. Your tensioner appears to be quite old - consider replacing with a new one that doesn't have a weakened spring from millions of cycles.
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post #6 of 35 (permalink) Old 03-16-2017, 07:56 AM
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Quote:
Originally Posted by dash_cam View Post
didn't the 92 come with a 3g?

regardless, i have a 96 which definitely has the 3g and i have a sag pump. i used the belt from a 96 e-150, 351w, with A/C.

goodyear 4061025/6pk2605
'92's came with the 2g alts, but that was the last year. pretty sure they switched to 3g in '93.

Quote:
Originally Posted by Spktyr View Post
The Saginaw and higher output 3G are increasing the load on the belt. Your tensioner appears to be quite old - consider replacing with a new one that doesn't have a weakened spring from millions of cycles.
x2.
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post #7 of 35 (permalink) Old 03-16-2017, 09:13 AM
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After I did my sag swap I went to a longer belt like everyone suggested and I had the same issue you have. My belt was too long, I threw the old belt back on (gatorback by the way, best automotive belt made IMO) and havent heard a chirp since.

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post #8 of 35 (permalink) Old 03-16-2017, 09:17 AM
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My old belt wouldn't even fit after the sag swap. Maybe I'm crazy and I'll try it again.


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post #9 of 35 (permalink) Old 03-16-2017, 10:32 AM
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Quote:
Originally Posted by jtetterton View Post
Forgive my ignorance, but the distributor was causing a squeak? How's that?

I've got a slight belt chirp at startup, 130amp alternator, sag pump, running a K061037 belt (103.7 ID, 104.25 OD).
The bushings were worn out so it would squeak at start up and at random when driving.
I never suspected the distributor until I pulled it out when I did my manifold gaskets, when I spun the shaft I got a squeak so I replaced it and haven't heard the squeak since.

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post #10 of 35 (permalink) Old 03-16-2017, 10:34 AM
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Hmm. Never thought about that. I'll look into the removal and replacement procedure for the distributor of a smaller belt doesn't help.


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post #11 of 35 (permalink) Old 03-16-2017, 11:57 AM
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Originally Posted by jtetterton View Post
Hmm. Never thought about that. I'll look into the removal and replacement procedure for the distributor of a smaller belt doesn't help.


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It wouldn't hurt to check it if the squeak doesn't go away. Remove it, put a little upward pressure on the shaft and turn it back and forth, if it feels rough or makes noise it MAY be your problem
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post #12 of 35 (permalink) Old 03-16-2017, 12:13 PM Thread Starter
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Hmmm.. Didn't even think to check the distributor. I'll have to look into that. As well as the tensioner.

There's no way the OE belt is going to fit. I tried that first off. It was short.

Thanks for the help everyone!
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1992 XLT, 5.8 w/ E40D transmission, TTB D44 in front, 8.8 rear, 4.88 gears w/ Eaton Posi, Gibson exhaust/headers,cb radio, 4" suspension lift, 33x12.5's on 8" Pro Comp wheels.

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post #13 of 35 (permalink) Old 03-16-2017, 12:28 PM Thread Starter
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Quote:
Originally Posted by jermil01 View Post
'92's came with the 2g alts, but that was the last year. pretty sure they switched to 3g in '93.



x2.
I have a 92 as well. What size belt did you use? I am wondering if mine is too short/long?

1992 XLT, 5.8 w/ E40D transmission, TTB D44 in front, 8.8 rear, 4.88 gears w/ Eaton Posi, Gibson exhaust/headers,cb radio, 4" suspension lift, 33x12.5's on 8" Pro Comp wheels.

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post #14 of 35 (permalink) Old 03-16-2017, 02:44 PM
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I think mine was 91 inches, or something around there. Yours will be different, my smog pump is deleted and I have a sag swap.
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post #15 of 35 (permalink) Old 03-16-2017, 03:49 PM Thread Starter
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Right on. Thanks man.

1992 XLT, 5.8 w/ E40D transmission, TTB D44 in front, 8.8 rear, 4.88 gears w/ Eaton Posi, Gibson exhaust/headers,cb radio, 4" suspension lift, 33x12.5's on 8" Pro Comp wheels.

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post #16 of 35 (permalink) Old 03-17-2017, 12:02 AM Thread Starter
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So,
I replaced the tensioner. I can turn it over and now no squeal. Although, I still think my belt may be a tad too long. I am not sure if the belt can cause this but, seems to me the rig just doesn't have as much umphh to it as it did before I switched out the belt and tensioner. I kinda think maybe I was more spot on with the other belt I tried.

Can the wrong size belt affect the performance or acceleration of the rig? I would think so, but, not sure.

1992 XLT, 5.8 w/ E40D transmission, TTB D44 in front, 8.8 rear, 4.88 gears w/ Eaton Posi, Gibson exhaust/headers,cb radio, 4" suspension lift, 33x12.5's on 8" Pro Comp wheels.

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post #17 of 35 (permalink) Old 03-17-2017, 02:56 AM
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Quote:
Originally Posted by B-man View Post
So,
I replaced the tensioner. I can turn it over and now no squeal. Although, I still think my belt may be a tad too long. I am not sure if the belt can cause this but, seems to me the rig just doesn't have as much umphh to it as it did before I switched out the belt and tensioner. I kinda think maybe I was more spot on with the other belt I tried.

Can the wrong size belt affect the performance or acceleration of the rig? I would think so, but, not sure.
Not really, but an increased load on the alternator from a partially discharged battery plus the additional power needed to turn the Saginaw can decrease usable engine power. One reason why Ford didn't just fit Saginaws or Saginaw-equivalents to all their vehicles is that the C2 pump was lighter and consumed less engine power. Ford only used the Saginaw (which, if you didn't know, was made by a division of General Motors, as is the four bolt steering box!) in applications where they thought it was absolutely needed.

Another possible explanation is bad bearings in some engine driven accessory - is the Saginaw pump new, used or rebuilt? How about the alternator? Did you replace or disturb any idler or other pulleys?

The only possible way that a badly sized belt can kill power is if it was ridiculously tight to the point where you have to shoehorn and really pry the belt on over the pulleys even without the tensioner pressing on it. That can cause issues with too much friction in rotating assemblies.
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post #18 of 35 (permalink) Old 03-17-2017, 09:49 AM Thread Starter
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Thanks for the response back. It is an older, tired motor. Ran better this morning. The previous belt was a lot tighter to get on. It wasn't driven much, so, hopefully inner bearings and such are okay. Alt and Sag are new.

I think it was just me. I am going to leave as is and see how it rolls tomorrow going out to the desert.

1992 XLT, 5.8 w/ E40D transmission, TTB D44 in front, 8.8 rear, 4.88 gears w/ Eaton Posi, Gibson exhaust/headers,cb radio, 4" suspension lift, 33x12.5's on 8" Pro Comp wheels.

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post #19 of 35 (permalink) Old 03-17-2017, 09:57 AM
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first off, to determine if the squeak is caused by the belt or something else you can remove the belt and crank the engine. only run it for a few seconds but if the belt is the cause, it wont squeak since the belt and pulleys arent spinning.

second, as a note, 93-96 broncos use the side mount alternator. the tensioner pulley is located under the alternator and theres an idler pulley in between the alternator and a/c compressor. on the 87-92 broncos like the OP's, the tensioner is between the alternator and the a/c compressor. the point is that the belt sizes are different between the years so keep that in mind.
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post #20 of 35 (permalink) Old 03-17-2017, 01:42 PM Thread Starter
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Right on. Thanks man.

1992 XLT, 5.8 w/ E40D transmission, TTB D44 in front, 8.8 rear, 4.88 gears w/ Eaton Posi, Gibson exhaust/headers,cb radio, 4" suspension lift, 33x12.5's on 8" Pro Comp wheels.

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