Water pump pulley squeaking

BigBlue05 · Mar 17, 2017

I've been doing some research on what pulley may be squeaking on my truck and I've read that the water pump pulley will squeak when accelerating. Is this true. I only hear the squeak when accelerating. But I just had my water pump replaced by the dealership a month ago. And I believe I'm correct in saying water pumps come with a new pulley.

SilverStreak88 · Mar 17, 2017

The only thing that I can think of that would squeal on a WP is when the bearing is going out (which, it being new you shouldn't have to worry about). It doesn't take much for a pulley to be off alignment for it to wear the belt into a squeak, the idlers and tensioner are a good place to start.

BigBlue05 · Mar 17, 2017

Would the tensioner only squeal while accelerating?

SilverStreak88 · Mar 17, 2017

It depends... You can usually tell it's toast if you can move it back and fourth with little effort, the tensoning spring usually goes and causes slippage of the belt on other pulley's making think that component is going bad when it's really just fine. I always replace the tensionor and all the idler pulley's together. You can do the string test to make sure all of your pulley's are centered as supposed to be and rule that out. The tensionor would be my first guess.

JPT · Mar 17, 2017

The only real way to tell, is to remove the belt (you dont have to take it off of the truck, just off of the tensioner). Then hand rotate each pulley. If any of them are bad, you will be able to hear the bearings as you rotate it.

My tensioner and alternator bearings were going bad. After replacing these, I still had a different (much quieter) squeal, turns out it was the belt.

I suggest checking each pulley AND a new belt.

CostaRam · Mar 17, 2017

When it squeaks when you accelerate (and sometimes not) then it's the belt slipping.
A dying bearing would squeal always, even when idle but probably less loud.
There is a belt conditioner spray, they can help, but a new belt would be the safer fix.
Chris

BigBlue05 · Mar 20, 2017

CostaRam said:
When it squeaks when you accelerate (and sometimes not) then it's the belt slipping.
A dying bearing would squeal always, even when idle but probably less loud.
There is a belt conditioner spray, they can help, but a new belt would be the safer fix.
Chris

Even though the belt brand new from the dealership

blackbeautyhemi · Mar 20, 2017

If you change the water pump you might as well change the other pulleys to. They don't cost that much.

BigBlue05 · Mar 21, 2017

blackbeautyhemi said:
If you change the water pump you might as well change the other pulleys to. They don't cost that much.

The water pump and the belt have already been changed. Before the squeaking started.

Water pump pulley squeaking

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