Oil leak from alternator decoupler pulley seal...again
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    1. #1
      Junior Member
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      Apr 2013
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      Toronto, Canada
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      Oil leak from alternator decoupler pulley seal...again

      Hi,
      I popped of my undercarriage tray this morning in prep for my annual krown rustproofing and got a bit of a surprise with oil residue on tray on drivers side just to the front of trans. Took a good look around and it looks like oil is coming down from from left of engine near top. I had previously changed the seal in behind the decoupled pulley a few years back and Iím thinking that it is leaking again. I suppose I could have put it in wrong but donít think so. Last time it started leaking was shortly after a very long road trip and coincidentally we just finished two road trips to NYC last month. Just wondering: with the P2ís I would not hesitate to replace PCV at this stage just to make sure I was not getting any positive cc ventilation. My understanding with the P3 is that PCV will whistle if it needs replacing and is fine otherwise. Is this correct?


      2002 V70XC, 2003 V40, 2004 S60, 2010 V70
      2010 V70 3.2 125,000miles
      2002 V70XC, 175,000 miles
      2004 S60 2.5T, 160,000 miles

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    3. #2
      Member
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      Aug 2017
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      3,185
      You sure it isn't the vacuum pump?

    4. #3
      Junior Member
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      Dec 2015
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      136
      Sorry to hear you are faced with this again. My understanding of PCV is that P2 has excess pressure when PCV system fails where the P3 generates excess suction to the crankcase.
      Last edited by Steve H; 08-29-2019 at 08:18 PM.

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    6. #4
      Junior Member
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      Quote Originally Posted by Tech View Post
      You sure it isn't the vacuum pump?
      Pretty sure but will definitely check when Iíve got all the annoying plastic bits off.


      2002 V70XC, 2003 V40, 2004 S60, 2010 V70
      2010 V70 3.2 125,000miles
      2002 V70XC, 175,000 miles
      2004 S60 2.5T, 160,000 miles

    7. #5
      Junior Member
      Join Date
      Apr 2013
      Location
      Toronto, Canada
      Posts
      900
      Quote Originally Posted by Steve H View Post
      Sorry to here you are faced with this again. My understanding of PCV is that P2 has excess pressure when PCV system fails where the P3 generates excess suction to the crankcase.
      Thanks, Steve. I was thinking same.


      2002 V70XC, 2003 V40, 2004 S60, 2010 V70
      2010 V70 3.2 125,000miles
      2002 V70XC, 175,000 miles
      2004 S60 2.5T, 160,000 miles

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