1HZ squealing fanbelts again

Harrow - have you ever tried rubbing a cake of dry soap on the belt.


A J

Hi
Sorry to hear of your troubles, did Toyota fit the belts?
Have had two 1hz"s and never had a problem.
Lyndon

In the good old days we used to run the belts and rub chalk onto the belts, VERY carefully. A stick of school chalk is good.

Harrow,

I donlt know what kind of belt they are on a 1HZ. However if they are those ribbed or 'grooved' belts and fitted with a similarly riibbed pulley, I had the sanme problem with Suzuku Swift a few years back.

After trying just about everything, including a new water pump and new alternator bearings, I finally figured out what it was.

The pulley had worn slightly and this was causing the 'grooves' in the belt to "bottom out" on the pulley grooves. This prevents the belt from sitting 'proud' in the grooves and it'll slip no matter how hard you tighten it, or no mater how much "Belt Grip" you spray on it.

I fixed mine by first removing the belt and then starting the engine - with a hard, fine, flat file running against the top edges of pulley grooves. I could only run the engine for about 5 minutes as without the one belt, there's no water pump. It is, howver an electric rad fan.

It wore out the file pretty quickly 'cos the pulley is very hard steel - harder than a file!! But it fixed it.

On a Suzi Swift this method was a lot easier 'n cheaper than taking the engnine out to remove the crankshaft pulley - a new pullley was "horrendous dollars" as well! It's an 'east-west' engine on the Suzis.

Bilbo

Harrow,

Putting genuine twin belts on was a good start. They are not ribbed. I change mine every 100,000k and theres no real sign of wear.

I think they are still insufficiently tensioned. The span on those belts is pretty short, so theres not much deflection when they are correctly tensioned. I take it when the belts were off, that the alternator and water pump rolled smoothly?

And I'll assume that you've ruled out noise from the air conditioner belt and idler pulley.

All V belts are designed to be driven from the sides, as one of the post above mentioned about the belt bottoming out, if it bottoms out the belt will be over heated and start to glaze.

I would check all your pulleys to see if the belts are bottoming out and if they are replace the pulley or have ir remachined.

Check also for belt alignment, a belt should have no more then 2mm over a 300mm span.

Using a file is not a good idea because it it very hard to get the right angle of the V.

One other thing is to check the cross section size of the belt, automotive belts come in a range of cross sections 9A, 10A, 11A, 13A, and 15A before you start going into B,C and Poly Groove belts.

Always make sure you use a belt designed for automotive applications....these belt are designed more for high speed.

Regards Richard

Dry soaps the go, works every time.

New belts usually need a retension after 1000kms, it sounds like they need a nip up, this fixes mine when my 1HZ belts squeal, same with the air con belt when you turn it on for the first time after winter

If your pulley is worn, maybe consider a belt with a slightly wider profile ? .......in the same length..... might be available.

Harrow,
You have a bunch of suggestions for slipping belts and a bunch for belts that are not slipping, but making noise. Hitting a slipping belt with the soap trick will only make it worse.

So what do you think? Is the belt slipping or not?

Usually if it makes noise at startup only, its slipping, and needs tightening.

Excellent thread! I have same problem and now I have food for thinking. Thanks everyone!

Thanks Guys

Sprayed on belt grip , lasted 24 hours

Given that 1000 km since install, tried retension , keeping in mind short deflection distance (still cautious about overtightening)

Squealing gone

So looks like you haveto be aggressive on belt tension

Regards

Bruce