XC90 mk2 D5 bearing failure

[Kev0607]

Originally Posted by anthv50

I was doubting myself all night that I should have heard the noise with the belt off. So I've took it off again today, i'm getting MUCH quicker at doing it, and took another video for your viewing pleasure. It definitely sounds very different without the aux belt on. I've gave it a few revs in this one, not too much since it doesn't have the torque bar fitted to the mount. So I am not sure whether the load of the alternator and the turned off air con, would be enough to make it so loud.

It definitely sounds much quieter, which is good news.

I just don't know what would be causing it. The belt is brand new, as is the tensioner. It must be one of the pulley's making a racket.

[anthv50]

Originally Posted by Kev0607

It definitely sounds much quieter, which is good news.

I just don't know what would be causing it. The belt is brand new, as is the tensioner. It must be one of the pulley's making a racket.

I know, it is still a diesel, and it sounds like one when you've got the cover off like in the video, but it's definitely not the same noise. I can get my ear close enough to the alternator to be quite sure it's not that, you would think turning the the air con off would reduce load on that pulley so likely not that. That only leaves the crack pulley, but I don't know how that could make such a noise and it is still spinning when there is no belt. There is nothing else ran off it. I am guessing the power steering pump is electric.

I am at a complete loss.

[Kev0607]

The steering will be electric, being a newer car.

As the noise stopped when you removed the aux belt, it would make you think its pulley/bearing related... I'm also not sure which one would cause such a racket though.

All the same, the noise does sound like a piston hitting a valve (the valve could be stuck on one of the cylinders). However, removing the belt, you'd think that knocking noise wouldn't stop, as the belt wouldn't make a difference to an engine knock.

Tricky... I hope you find the solution. I don't know what else to suggest, apart from getting it in somewhere to diagnose it and fix it as soon as. I hope its not engine knock.

[anthv50]

Originally Posted by Kev0607

The steering will be electric, being a newer car.

As the noise stopped when you removed the aux belt, it would make you think its pulley/bearing related... I'm also not sure which one would cause such a racket though.

All the same, the noise does sound like a piston hitting a valve (the valve could be stuck on one of the cylinders). However, removing the belt, you'd think that knocking noise wouldn't stop, as the belt wouldn't make a difference to an engine knock.

Tricky... I hope you find the solution. I don't know what else to suggest, apart from getting it in somewhere to diagnose it and fix it as soon as. I hope its not engine knock.

me too. I think best case it is the crank pulley, but even then I'm not sure how it would make such a noise. Looks like i'll have to wait until it goes in next wednesday

[GrahamBrown1]

On the older 5 cylinders the crank pulley is also a vibration damper and could fail. I’m not sure if this engine has similar I would suspect so. On larger engines I’ve dealt with the vibration dampers are a solid lump but have fluid inside. They would sometimes crack but you wouldn’t hear any sort of noise. If the pulley on the Volvo engines started to separate it could knock if it’s 2 metal masses tho I haven’t had one in my hand to look at.

[Black dog]

It sure sounds like crank pulley and I've changed a few for the same noise.not cheap either

[anthv50]

Originally Posted by Black dog

It sure sounds like crank pulley and I've changed a few for the same noise.not cheap either

Thanks that's really helpful. A crank pulley is cheaper than a rod bearing!

Have you done one on a XC90? Do you have any advice? Is there a way to lock the engine so you can unbolt it? I remember doing one when I was very young and it involved my ex girlfriend standing on the brake while me and her dad hung off a long breaker bar. That was on a 10 year old Peugeot, I'm not sure if i feel comfortable putting that kind of pressure through the gearbox.

[Black dog]

I've done them on a few xc60 but I just done the centre bolt with an impact gun, there is 4 torx bolts on the outside also but they are not very tight

[johnnyoro]

Hi the engine sounds ok with the aux belt off
Have you spun the alternator and aircon pulleys by hand to check them . Both these pulley have clutches built in to them which can fail. Sounds more like one of these has failed to me .
Hope it's not expensive when you find the cause

[anthv50]

Originally Posted by johnnyoro

Hi the engine sounds ok with the aux belt off
Have you spun the alternator and aircon pulleys by hand to check them . Both these pulley have clutches built in to them which can fail. Sounds more like one of these has failed to me .
Hope it's not expensive when you find the cause

I'm going to buy a new crank pulley from volvo because I can't find any pattern parts for it, that is £270, and get it fitted on Wednesday. If that doesn't cure it then both of those parts will be in the firing line. Im basically going cheapest to move expensive. I kind of ruled out the alternator because its mounted so high up I can pretty much put my ear to it, and it didn't sound like it was coming from that, I ruled out the AC pump because it still did it with the AC turned off. At least that is my wishful thinking that it's not going to cost me anymore money.

I know this is a volvo forum, but I think this issue with the recently parking brake wire failure has made me look around and what I am replacing it with and that time is coming sooner than I had originally planned. I would have considered an electric XC60 but that doesn't seem to be coming anytime soon.