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Leaky PS pump V8

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).
TXMatti
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Year and Model: 2009 xc90
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TXMatti

Leaky PS pump V8

Post by TXMatti » Sun Jan 26, 2020 1:16 pm

Allright, lets get real specific here...

So the patient is a 2009 XC90 with the V8. Issue is that it keeps puking power steering fluid from up top near the pump. Judging by previous posts on this forum, could be very likely it's a blown O-ring up there.

So, here's my question... Do I have to take the upper plenum out and open up the cooling system to do this, or is there a way to wrangle new o-rings in there without tearing the whole place apart?

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ggleavitt
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ggleavitt

Re: Leaky PS pump V8

Post by ggleavitt » Mon Jan 27, 2020 5:40 pm

See photo, you can probably get to the high pressure side in place (O-ring is PN 988119). Power steering pump (exch) is PN 36000748, will be happy for you if it's only the o-ring. Plenum upper gasket are PNs 30720327 and 30720328 and if top comes off, you'll need to drain some coolant (good time to swap out with OE). My seeping was from the back seam, replaced before it got worse and still have the original pump- if someone knows where to get them quality rebuilt, let me know. When pump comes off belt comes off. If the vehicle is over 100k and the tensioner and idlers have already not been replaced, probably good time to do them all together. Keep the tensioner bracket if you do replace, you'll use it again some day.
IMG_2971.JPG
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2005 2.5T AWD-198k
2008 V8 AWD Sport-129k

Sunstar33
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Sunstar33

Re: Leaky PS pump V8

Post by Sunstar33 » Fri Jan 31, 2020 8:28 am

Dealer wont sell specific o-ring . so heading to autoparts and finding a correct size is a easy fix for about 5 bucks.

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ggleavitt
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ggleavitt

Re: Leaky PS pump V8

Post by ggleavitt » Fri Jan 31, 2020 12:08 pm

The steering rack side (high pressure) o-ring is readily available, PN 988119 as noted above. Reservoir (pump fluid input) side o-ring is not a replaceable PN on it's own, see photos for reference. I took a micrometer to the o-ring: approximate measurements are 14mm ID, 17mmOD, and 2-3mm thick (mine are flat on the sides).
IMG_3032.JPG
IMG_3034.JPG
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2005 2.5T AWD-198k
2008 V8 AWD Sport-129k

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