What is making this squeaking noise?
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More Turbo
Joined: Jan 2013
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What is making this squeaking noise?
At first I thought it was the idler pulley. So I replaced it. Still squeaked. Got another one. Still squeaked.
I was about to replace the water pump, but then I noticed that the squeak is not in time with the pulley rotation - it is in time with the belt rotation. Every time the printed decal on the back of the belt goes past the idler, it squeaks.
I tried putting a drop of dish soap on the idler pulley - no change.
Could it be the tensioner itself squeaking as the thicker part of the belt goes by? I would not think the decal substrate was that thick.
I know it's not the water pump as when I remove the belt the water pump keeps turning from the other belt and it's silent.
I used a mechanic's stethoscope (what a neat gizmo!) and it's definitely coming from the idler mechanism - not the power steering pump and not the AC compressor.
Steve
I was about to replace the water pump, but then I noticed that the squeak is not in time with the pulley rotation - it is in time with the belt rotation. Every time the printed decal on the back of the belt goes past the idler, it squeaks.
I tried putting a drop of dish soap on the idler pulley - no change.
Could it be the tensioner itself squeaking as the thicker part of the belt goes by? I would not think the decal substrate was that thick.
I know it's not the water pump as when I remove the belt the water pump keeps turning from the other belt and it's silent.
I used a mechanic's stethoscope (what a neat gizmo!) and it's definitely coming from the idler mechanism - not the power steering pump and not the AC compressor.
Steve
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More Turbo
Joined: Jan 2013
Posts: 623
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OK, I did some googling and low and behold, this video let me trouble shoot it immediately. It's definitely the belt.
I was about to replace the whole tensioner mechanism. Now I see it's cheap belts.
Steve
I was about to replace the whole tensioner mechanism. Now I see it's cheap belts.
Steve
Fleet Owner
Joined: Aug 2010
Posts: 21,253
Likes: 1,656
From: Reynoldsburg, Ohio
I've used both Motorcraft and NAPA serpentine belts with good success---never a squeak or failure in over 200K miles three different 5.4's. Also used Motorcraft tensioners with similar results.
BTW Motorcraft can be had fairly priced through eBay and/or Amazon---well worth looking at when needing such things.
BTW Motorcraft can be had fairly priced through eBay and/or Amazon---well worth looking at when needing such things.
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More Turbo
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Does anyone know the Motorcraft part number for the belts for a 1990 E350 460 CID EFI engine?
One belt does fan, alternator, air pump.
Other belt does fan, AC, power steering.
One belt does fan, alternator, air pump.
Other belt does fan, AC, power steering.
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Fleet Owner
Joined: Aug 2010
Posts: 21,253
Likes: 1,656
From: Reynoldsburg, Ohio
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