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  1. #1
    Join Date
    Jun 2015
    Location
    Los Angeles
    Posts
    122

    Default What chewed up my timing belt?

    I have a 2001 V70XC, and I was replacing the VVT solenoid when I noticed the timing belt was all chewed up, as shown in the pictures.

    Any idea what caused this?


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  2. #2
    Join Date
    Dec 2010
    Location
    Cumbria, UK. Maine USA.
    Posts
    493

    Default

    Only removing the timing cover is going to reveal what caused that? seems to be offset on the cam gears,

  3. #3
    Join Date
    Jun 2013
    Location
    Northeast
    Posts
    521

    Default

    Manually rotate the crankshaft with a large socket and extension and try to see what the belt is rubbing up against? In that first pic, it looks like the housing might also be damaged. Was the belt rubbing against that or the timing belt cover?
    2007 XC70, 206,000 miles
    2002 V70XC, 130,000 miles, parts car

  4. #4
    Join Date
    Aug 2017
    Location
    Pleasanton CA USA
    Posts
    412

    Default

    It looks like the belt has been drifting towards the engine block while under load. If you've used a belt sander, you know what belt drift looks like.
    It only takes a tiny imbalance in belt tension from one side of the belt to the other to induce drift. How could that occur? The TB idler and/or tensioner are the likely culprits. As they get old and worn, they lose perfect perpendicularity to the belt.....then belt creep occurs. That's why these parts are always replaced with the TB change. You're lucky the drift was inward....if it were outward, the belt would have come completely off, and you'd be looking at bent valve stems.

  5. #5
    Join Date
    Aug 2017
    Location
    Pleasanton CA USA
    Posts
    412

    Default

    Can you share how many miles (kms) this belt served for? I've always been curious how conservative Volvo is being recommending
    10-years or 120K miles? Anyone ever seen a histogram of TB failures for these Volvo engines?

  6. #6
    Join Date
    Jun 2015
    Location
    Los Angeles
    Posts
    122

    Default

    Quote Originally Posted by pbierre View Post
    Can you share how many miles (kms) this belt served for?
    I've only had the belt on for 20-30 thousand miles.

    Something is clearly chewing it up, however, so I don't think it's the fault of the belt.

    I'm going to take it apart tonight, so hopefully I can find what is eating it up.

  7. #7
    Join Date
    Oct 2011
    Location
    Northshore - Great Lakes
    Posts
    803

    Default

    A possible suspect is the metal belt protector that goes over the crank pulley. Either incorrect install (seating) of this protector, missing or the longer bolt may be the cause.

    The belt protector #1 goes around item #13 in the following diagram:
    Last edited by Xheart; 04-02-2018 at 05:59 PM.
    2001 V70XC - Nautic Blue/ 2-tone Sand/ Premium/ Instant MPG 12 - 63/ Pirelli P4 12/32" - 740/ Duracell 48/ MOBIL-3309/ Pennzoil EURO 5W-40/ Zimmerman Z-coated/ Akebono/ 190K-mi/ Great Lakes

  8. #8
    Join Date
    Feb 2010
    Location
    Virginia Beach
    Posts
    3,869

    Default

    Somebody put the wrong length bolt in somewhere - the belt shield (#1 in the diagram) has a screw in it, I think and the back side of the engine has a screw or bolt that holds on the axle bearing and some shielding... If someone wasn't careful about using the correct length, I could see a bolt sticking into the path of the belt.
    Current Fleet:
    2016 Tundra Crewmax 4WD 1794
    2005 MB S600 (100K, Michelin AS3+, M1 0W40)
    2002 V70-XC (238K, Castrol Edge 0W40)
    2002 V70-T5 (195K, IPD bars, Bilsteins)
    2001 V70-T5 (76K)
    1932 Packard Sedan (straight 8, dual sidemounts, original paint and interior, Shell Rotella 15W40)

  9. #9
    Join Date
    Dec 2010
    Location
    Cumbria, UK. Maine USA.
    Posts
    493

    Default

    Quote Originally Posted by sabbates View Post
    I have a 2001 V70XC, and I was replacing the VVT solenoid when I noticed the timing belt was all chewed up, as shown in the pictures.

    Any idea what caused this?


    Click image for larger version. 

Name:	IMG_4727.jpg 
Views:	103 
Size:	97.8 KB 
ID:	8520
    Click image for larger version. 

Name:	IMG_4728.jpg 
Views:	79 
Size:	96.9 KB 
ID:	8521
    We are all waiting for your findings as to what caused this, we are running out of probabilities, please end our suspense and report back after you get the covers off, most interested in the cause of this.

  10. #10
    Join Date
    Feb 2013
    Location
    Boston, MA
    Posts
    1,155

    Default

    No one noticed it's all covered in oil? A drop of Pentosin on a serpentine belt w/ 4k miles only was enough to warrant it's destruction the next morning.
    2002 V70 (sold)
    2005 XC70 (Telos Road took it. Did a chassis swap)
    2016 XC60

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