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While I am in there...

Help, Advice, Owners' Discussion and DIY Tutorials on Volvo XC90s. The XC90 proved to be very popular, and very good for Volvo's sales numbers, since its introduction in model year 2003 (North America).
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While I am in there...

Post by dnwong » Fri Jun 12, 2020 6:04 am

So, car died and I thought it was the alternator that failed. It turns out that on a 3.2, the coupler bolt that secures the drive sprocket to the engine has come loose. Save me 500 for a new alternator. Loctited the bolt and put the original alternator back.

It was a lot of work getting the intake out so I wanted to see if there was anything else I should address before putting it back together. I see a lot of oil leaking and was wonder where it may be originating from.
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Re: While I am in there...

Post by ogatrulle » Fri Jun 12, 2020 12:51 pm

Could it be the brake booster vacuum pump? Mine started leaking around 120k miles and the oil dripped down around the serpentine belt area forward and rear, and eventually down to the bottom of the transmission and onto the mud shield.

There are rebuild kits available for the vacuum pump. I did mine about a year ago and it was a relatively easy job.
2006 v70 2.5T; 2008 xc90 3.2

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Re: While I am in there...

Post by chitownV » Fri Jun 12, 2020 1:28 pm

That does look exactly like a vacuum pump o-ring leak.
2008 XC90 3.2 AWD - 150k miles, Premium, Versatility 7 passenger, Climate, Convenience, retrofit Morimoto D2S HID bi-xenon, iPd swaybars & poly bushing inserts, Powerflex poly control arm bushings, Bilstein Touring Fr struts, Bridgestone Dueler H/L Alenza Plus 255/55R18, Fr Infinity tweeters & speakers, hardwired cheap $17 Bluetooth to center console aux & pwr, CQuartz UK 3.0 ceramic coated, no oil consumption using Mobil 1 0W-40 even w/ my lead foot

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Re: While I am in there...

Post by pgill » Fri Jun 12, 2020 3:24 pm

Thermostat and
small coolant hose with O-ring


Overdrive pulley for the alternator

Note: when the overdrive (or clutched pulley if you prefer) fails the bolt on the drive pulley becomes loose

The pulley is like a freewheel on a bicycle, it only engages in one direction


You will need a tool to replace the pulley

Good Luck


PS the Serpentine belt also has a clutched pulley, you should be able to move the belt easily in one direction

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