colorado squealing sound

G'day Croc,

Even though the belts appear good, they may still be the cause. Put a small amount of water onto them & the pulley's when the engine is switched off & cold - start the car & go for a drive.

If the noise has gone, you now know the cause. If it hasn't, you've eliminated belts as the issue.

Good luck with it!

Kevin.

Check for a cat.

Alternator bearing perhaps

Croc
Does it ONLY do it while driving???
IF only while driving then it is most likely the outer CV's where they enter the suspension/axle support. If only while driving then spray some Lanolin in where the cv disappears into the hub/axle unit. The seals run dry and squeals. Very common on Collies BT50 and Dmax.

If it squeals with engine running and not driving then it will most likely be the belts. Pre 2012 Collies, like Dmax, have a 7PK belt and a v belt. After some wear approx 40,000km the v belt wears and tries to run at a different speed to the 7PK. The wide 7rib belt wins every time and because they both are driven off the crank pulley the v belt is now made to slip and it squeals. Stupid design. If left and a new belt not fitted it will be destroyed because of the mismatch in speeds.

Depending on when it happens these are the two most likely. Depending which one, it is no use to spray stuff on the belts to check, One happens with driving and the other happens with a few revs. If it is the belt option then ONLY replacement will stop it for a while until it too wears. There is an alternative to fit a different shorter belt if required.

Ross M

In my 09 Collie, a squeal has happened a few times - at about 80Klicks and lasted a few Ks only - does not seem related to either road speed or revs ?? - did not last long enough to find where originates - belt sound way less expensive than CV ?

Richard

Thanks for the replys, v belt is new and as it only happens while driving im leaning towards the cv suggestion. Will try some lube spray and let you know how it goes.

Cheers Croc

First you have to workout when the noise starts...... sure I know it's above 40kph, does it happen in all gears, when you turning or driving straight, when you hit a bump, what happens when you apply the brakes, increase or decrease your revs, have it in a different gear, coast in neutral, wobble the steering wheel, air con off and on, headlights heated rear window and inside fan on high speed, fresh or recirculated air.

Does the noise change in the wet or dry, is it an induction or road induced noise, could it be wind noise, is the noise being transferred from another area?

I know I have asked some stupid questions but they all help in diagnosing what, where and how the noise is being generated.

Croc, I know this may be a completley different set of facts but I get a high pitched noise when my Prado is in idle. Three dealers later it remained. After walking around the rear and placing my foot on the exaust it stopped. It appears that some rubber buffer onto some part just give it a chance to annoy the crap out of me. A quick spray of silicone keeps it quiet for a couple of months and away it goes again. Underneath to repeat the procedure and problem solved for the time being. I am still not sure what bracket it is though Cheers RodnEls

Croc


Could it be escaping exhaust gas? Cracked manifold, broken manifold stud etc

Bob

Croc nsw, My Colorado does the same thing. Our local dealer mechanic showed me how to spray CRC/WD40 on the inside of front hubs. The seals appear to get dust & more particularly after rain, squeal like hell. It fixes the problem for a while, usually til the next rain.

Ross M, thanks your suggestion seems to have worked, thanks too to everyone else for your input, incl Reesman. Hopefully I wont need the other info but glad to have it if needed in the future. Don't know about the "Bee Gees" suggestion, lol.