XC60 D5 auxiliary belt failure

[TeamG]

Originally Posted by Bonefishblues

With an aux belt failure? Surely not, unless you mean the aux belt takes out the cambelt?.

That’s exactly what happens. Aux belt gets wrapped around the crankshaft pulley and takes out the cambelt.

[Kev0607]

Originally Posted by Bonefishblues

With an aux belt failure? Surely not, unless you mean the aux belt takes out the cambelt?.

Aux belt takes out the cam belt = destroyed engine
Snapped cam belt on its own = destroyed engine

Either way, the outcome isn’t usually a good one.

[Bonefishblues]

Aux belt often doesn't take out the cambelt, as previous posts indicate. Inconvenient only.

I've never heard of a cambelt snapping on a D5. Have you or any others?

That discussion aside, wtaf is going on with these multiple failures at low mileage - again the first time I have heard of this. Tensioner issues?

[Lancee]

Is the issue perhaps mainly with newer stop/start vehicles ?

[Bonefishblues]

Originally Posted by Lancee

Is the issue perhaps mainly with newer stop/start vehicles ?

Possibly, but there's legions of stop start cars out there and I've never heard that about any others suffering?

[GrahamBrown1]

Originally Posted by RDesign4Life

It's a reasonable assumption that these belts are simply not strong enough either inherently so by design or by diminishing quality of manufacture.

Either way what cannot help is the stupidity of stop/start functionality. Pre 2014 XC60s would have tugged on their belts from rest once per trip (when starting the engine). The introduction of stop/start crappery meant the number of occasions of these induced stresses from 0rpm to 750rpm would be increased by several hundred percent every journey which can only serve to shorten the effective life of the item.
This is why I always turn off the stop/start immediately after starting the engine every single journey before I even put the car into drive.

This is most certainly a factor I feel and i also follow this practice for this reason!

The belts are made dayco in Italy as is the tensioner from what I could work out from the genuine parts I last fitted.

[GrahamBrown1]

Originally Posted by Lancee

Is the issue perhaps mainly with newer stop/start vehicles ?

This issue plagued these since this design was introduced. Older engines with the much thicker aux belt didn’t suffer that often tho if they were neglected the aux belt could rip the cambelt tensioner from the block!

When this set up came out in 2007 there was recall after recall for the tensioners as these were failing or wearing the belts out. Why they went to a two belt system I don’t know there was nothing wrong the the thicker single belt set up. Ford cost cutting and no dought so called engine efficiency rubbish.

[Lancee]

Originally Posted by Bonefishblues

Possibly, but there's legions of stop start cars out there and I've never heard that about any others suffering?

I have the impression that D5's seem to have always had the issue of the auxilliary belt occasionally derailing the cambelt. Apparently considered by some to be an achilles heel of this particular model.

I don't perceive it as having been a truly major problem as long as the recommended belt/tensioner/idler changes were carried out at the recommended service intervals (108,000 miles for cambelt, 54,000 miles for the auxiliary ?).

Not sure when the first Volvo (D5) stop/start vehicles were introduced (2009 ish?), but in view of the apparently more regular failures I do wonder if it may be the extra forces applied to the belt/s during stop/start which is increasing the problem ? Indeed I think the auxilliary belt interval may have been reduced at some stage to 54,000 miles by Volvo from what originally may have been, as with the cambelt, 108,000 miles ?

The original question seems to be what is causing the issue ? The above are just some thoughts on my part, but I do appreciate that a little knowledge (again on my part !) can be a dangerous thing.

[Bonefishblues]

Originally Posted by Lancee

I have the impression that D5's seem to have always had the issue of the auxilliary belt occasionally derailing the cambelt. Apparently considered by some to be an achilles heel of this particular model.

I don't perceive it as having been a truly major problem as long as the recommended belt/tensioner/idler changes were carried out at the recommended service intervals (108,000 miles for cambelt, 54,000 miles for the auxiliary ?).

Not sure when the first Volvo (D5) stop/start vehicles were introduced (2009 ish?), but in view of the apparently more regular failures I do wonder if it may be the extra forces applied to the belt/s during stop/start which is increasing the problem ? Indeed I think the auxilliary belt interval may have been reduced at some stage to 54,000 miles by Volvo from what originally may have been, as with the cambelt, 108,000 miles ?

The original question seems to be what is causing the issue ? The above are just some thoughts on my part, but I do appreciate that a little knowledge (again on my part !) can be a dangerous thing.

I was referencing snapped aux belts specifically, which if it's connected to start-stop would surely affect lots of other brands with Dayco OEM belts?

[Lancee]

Originally Posted by Bonefishblues

I was referencing snapped aux belts specifically, which if it's connected to start-stop would surely affect lots of other brands with Dayco OEM belts?

Perhaps auxiliary belts do fail more regularly in other manufacturers stop/start cars, but owners don't have the further repercussion of a wrecked engine ? Not trying to justify my point, just add to my observations..