Well, that was short lived - about 10-12 miles - and then back to squealing. I’ll pull the belt off and soap it down and try to rig up something better to sand the groove on the lower pulley.
Fan belts squealing - can’t seem to solve
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My 1968 GTX with AC has belts squeals because I don’t have the 1968 power steering pump brackets on it (I have the 1969 version). I have the correct brackets now, but not installed due to a rod knock that developed a few years ago. Good luck with your issue!
themechanic
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Was it rpm sensitive as mentioned above or a constant squeal?
Unkle Krusty
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The belt on my boat was squealing. Had to tighten it too much to stop the noise. New made in China belts, two of them. Put on a used made in USA and the noise stopped.
I suspect the belt quality is a problem.
I suspect the belt quality is a problem.
themechanic
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That is probably the source of my belt squeal. All new pulleys from Bouchillon Performance Engineering are powder coated. Only squeals above 2300 RPM.
Any chance your belts are Gates? Reason I ask, is a few years ago I went trough the same deal. I had bought Gates belts all my life thinking they were the best. Never a problem until a few years ago. I think I tried 8 different Gates from different sellers and they all squealed. Ended up trying some Oreilly house brand, and they were perfectly quiet. Been using that brand ever since.
It starts when the rpm’s get into the 2500-3000 rpm range with moderate acceleration. Cruising at 55-60 at steady throttle it’s quiet - not sure about higher speed. Cruising along at 25 - 35 mph in drive I can just goose the throttle and it squeals. I have a looser than stock converter so the rpm’s are probably flashing to 2500+ rpm’s when I do it.
Buying someone else’s semi-restored (rebuilt better term) car is so much fun. After owning for 20 years I realized the lower brace from the alternator to the idler pulley mount was missing. So I bought that and installed thinking it might help - but not. And then last year I realized the rear part of my Federal PS pump was missing and just the front bracket piece was mounting it. So I bought a new reproduction mount installed hoping it might help in some way - but again, no bueno.
Going back to trying one of my old Quanta’s show poodle old-style belts to see if it helps.
Soaped it up good first. Will see what this does this afternoon.
I’ve accumulated a good number of unused and low use belts by now.
Soaped it up good first. Will see what this does this afternoon.
I’ve accumulated a good number of unused and low use belts by now.
cudamark
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When I had a belt squeal problem, I would run the RPM's up to where it made the noise and then used a spray bottle with water in it to see which "belt" was making the noise. It was almost always the pulley causing it, so, off with the pulley and into the bead blaster it went. A little spray paint and back on with no squeal now.
lemondana
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What is the brand and number on the belt that you are using now? Is it the wide belt?
The belts are all 3/8” (15 mm) except for the PS pump which is sized for a 1/2”(17 mm) belt. Those are the stock belt sizes for the year. I tried fitting a 1/2” belt on the water pump pulleys but they stick out of the pulleys quite a bit. I’ve been running Dayco Top Cog belts but I switched back to one of my old Quanta’s Mopar Restoration belts on the water pump to if soaping its sides might fix it.
lemondana
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I've been following your belt problems. So which belt do you believe is the squealer?
Are the contact faces of the offending belt glazed at all??? Or are there cords showing on the faces?
Roughing it up a touch with some fine sandpaper might change the noise - at least you'll hear a difference.
Maybe the belt is just a poor-quality part off the line.
Geoff 2
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I would be looking at what accessories/devices these belts are driving. P/S & A/C? Belt squeal with all these different belts is not normal. Maybe one of the driven accessories is failing internally, building up a lot of friction/resistance.
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I'm curious where you found the weird conversion chart that shows a 3/8" to be 15 millimeters.
and 1/2" to be 17mm.
That’s my mistake. Dayco starts their numbering out for 3/8” belts with a 15 and with a 17 for a 1/2” belt. So a 3/8” by 36” belt is #15360, a 1/2” x 40-1/2” belt is #17405, etc. So no, it apparently can’t be a metric figure with 25.4 mm/inch. Not sure what it represents.
It’s the water pump belt with idler due to factory AC. I accidentally referred to it earlier as the PS belt but it’s the water pump belt. Too many belts on the thing.
It’s the water pump belt with idler due to factory AC. I accidentally referred to it earlier as the PS belt but it’s the water pump belt. Too many belts on the thing.
lemondana
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The 3/8 were the 13/32" series belts which all Mopars and GM's used back in the day. There are still a very few 13/32" belts made anymore. Somewhere in the late 80's, early 90's all the belt companies phased out the narrow belts replacing them with the 15/32" belts the 15 belts. Most all of you actually have the wrong belts on your cars. Go to a car show and look at the Mopars and GM's and 90% of them have the wrong belt on them. Belts are not supposed to stick up out of the pulley at all, should be flush across the top. Fords usually used the 15/32" and the 17/32" belts.
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