aux belt failure x5 40d

mr angry · Post by **mr angry** » Wed Dec 21, 2022 5:01 pm

2010 X5 40D

Started car this afternoon and went to drive away and felt/heard a thud. Noticed loss of power steering so had a peek under the bonnet to see that the aux belt had come off. Due to it getting dark I just parked it up after a cursory look. It is not easy to see the idlers and tensioner from the top, but could see that the crank pulley looked to be intact and still in place.

Had a quick look online for an aux belt kit with idlers and tensioner but struggling to find any. Also struggling to find any posts relating to such a failure on this engine. Has anyone experienced this issue and /or purchased a new aux belt kit?

X5Sport · Post by **X5Sport** » Wed Dec 21, 2022 5:26 pm

Not seen such yet. The only value kit shown is for cars with adaptive suspension. What the actual difference is I can’t see from the RealOEM data.

The good book suggests you need to get the electric fan & cowl off and there’s a special tool (a long steel pin) that has to be inserted in the tensioner to get it out of the way (by rotating the pulley below it clockwise thereby increasing the spring loading on it) and for some slack before fitting a replacement belt.

It doesn’t look difficult but there’s very little room to play with. It might be possible to get into the gap without removing the fan cowl.

: 94973121-8A05-437C-BF44-DBFE65060835.jpeg (103.01 KiB) Viewed 4300 times

Image for X6 with the same engine.

Leslie · Post by **Leslie** » Wed Dec 21, 2022 5:53 pm

Did it have the recall for the bolt on a tensioner that could shear off ?

mr angry · Post by **mr angry** » Wed Dec 21, 2022 6:09 pm

Had a look online and this only seemed to be for M57 engine

mr angry · Post by **mr angry** » Wed Dec 21, 2022 6:10 pm

X5Sport wrote: ↑Wed Dec 21, 2022 5:26 pm Not seen such yet. The only value kit shown is for cars with adaptive suspension. What the actual difference is I can’t see from the RealOEM data.

The good book suggests you need to get the electric fan & cowl off and there’s a special tool (a long steel pin) that has to be inserted in the tensioner to get it out of the way (by rotating the pulley below it clockwise thereby increasing the spring loading on it) and for some slack before fitting a replacement belt.

It doesn’t look difficult but there’s very little room to play with. It might be possible to get into the gap without removing the fan cowl.

94973121-8A05-437C-BF44-DBFE65060835.jpeg

Image for X6 with the same engine.

Seems odd it only lists cars with adaptive suspension

X5Sport · Post by **X5Sport** » Wed Dec 21, 2022 7:28 pm

Sorry I meant Adaptive Drive (which I think is the same thing), and I still would expect a kit for those without. Perhaps there’s a hard service interval for that variant - not that it’s mentioned. The belt’s the same!

mr angry · Post by **mr angry** » Thu Dec 22, 2022 2:33 pm

Just had a look and lower crank pulley has failed. Looking at eurocarparts they want £499…wtf

sapphireblack · Post by **sapphireblack** » Thu Dec 22, 2022 4:20 pm

Blimey, wounded rhino time it seems, commiserations.

Leslie · Post by **Leslie** » Thu Dec 22, 2022 5:13 pm

Damn is it gold plated

mr angry · Post by **mr angry** » Thu Dec 22, 2022 9:54 pm

: BC0FB37D-40CA-4A43-93CC-D7D858927C10.jpeg (118.55 KiB) Viewed 4199 times

sapphireblack · Post by **sapphireblack** » Thu Dec 22, 2022 10:17 pm

I confess I'm not sure exactly what those images depict but it sure looks broken

mr angry · Post by **mr angry** » Thu Dec 22, 2022 10:22 pm

Its basically the crankshaft pulley which has split into two parts where the rubber joining them has deteriorated, split then separated.

sapphireblack · Post by **sapphireblack** » Thu Dec 22, 2022 10:45 pm

And that item is basically £500 ? Life is increasingly a pi$$ take in so many ways, with so many ways to be ripped off.

Hell, I'll be joining all the strikers soon

mr angry · Post by **mr angry** » Thu Dec 22, 2022 10:51 pm

I managed to find one on ebay for £200 but the seller uses royal mail who are striking. Guess the car will be off the road til next year

sapphireblack · Post by **sapphireblack** » Thu Dec 22, 2022 10:54 pm

Saving £300 is probably worth a bit of inconvenience

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