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Thread: Timing belt question

  1. #1
    Join Date
    Aug 2018
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    NH
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    2

    Default Timing belt question

    Hi all,
    I just completed allot of work on my 2004 XC70 AWD. I replaced the Head gasket and all timing components. I noticed the my timing belt tensioner moves back and forth while the engine is running. Is this normal? Also, does anyone know what the normal engine temp is when the engine has been running for awhile?

    Thanks,
    Frank

  2. #2
    Join Date
    Mar 2005
    Location
    Pacific Northwest
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    1,892

    Default

    Thermostat opens around 180-190F and I've seen ATF (heat matches coolant via heat exchanger) around 90C (in VIDA) after warm up so I would guess around 190-195F+

    Don't know about TB tensioner movement. Usually have the cover back on and can't see after the TB job.
    Past Volvos : 01 V70 T5, 01/02 V70XC, 02 V70 NA, 00 V70XC
    Past Others : 01/03 VW MK4 Turbo/NA/01M. Gen1 Prius, Gen1 CRV, Gen2 Rav4, 05 Accord, 08 Element, 02 Town&Country, 06 Corolla, 04 e320
    Current EV/Hybrid : 13 Tesla S85, 11 Gen3 Prius
    http://www.freewebs.com/howardsvolvos/

  3. #3
    Join Date
    Feb 2010
    Location
    Virginia Beach
    Posts
    3,633

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    Timing belt tensioner is intended to move with heat/cool cycle. Tension must be set at 20C. Details in the resources section.
    Current Fleet:
    2016 Tundra Crewmax 4WD 1794
    2005 MB S600 (96K, Michelin AS3, M1 0W40)
    2002 V70-XC (233K, AltiMax RT43, Castrol Edge 0W40)
    2002 V70-T5 (195K, IPD bars, Bilsteins, Contis, Mobil 1 0W30)
    1932 Packard Sedan (straight 8, dual sidemounts, original paint and interior, Shell Rotella 15W40)

  4. #4
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    Aug 2018
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    NH
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    Thanks for the replies, I really appreciate the help. I realize the tensioner is supposed to move based on heat but mine throttles back and forth like a clock ticking counter clock-wise from the 12 o'clock position to the 11 o'clock position then back to the 12 position. I also made sure I tensioned the belt correctly upon installation. Everything seems to be running fine, I just noticed the movement and was curious. Like howardc64 said I normally have the cover back on and never seen one until now. I just want to make sure im not setting up my new components to fail prematurely. Thanks again for the help.

  5. #5
    Join Date
    Feb 2010
    Location
    Virginia Beach
    Posts
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    Ah, I see...

    I've not run the engine without the accessories in place, so I haven't watched the timing belt, or tensioner while running. It's reasonable to assume that the spring will allow it to move while running. Serpentine belt tensioners do that while running.
    Current Fleet:
    2016 Tundra Crewmax 4WD 1794
    2005 MB S600 (96K, Michelin AS3, M1 0W40)
    2002 V70-XC (233K, AltiMax RT43, Castrol Edge 0W40)
    2002 V70-T5 (195K, IPD bars, Bilsteins, Contis, Mobil 1 0W30)
    1932 Packard Sedan (straight 8, dual sidemounts, original paint and interior, Shell Rotella 15W40)

  6. #6
    Join Date
    Mar 2005
    Location
    Pacific Northwest
    Posts
    1,892

    Default

    Quote Originally Posted by gtacs View Post
    mine throttles back and forth like a clock ticking counter clock-wise from the 12 o'clock position to the 11 o'clock position then back to the 12 position.
    Whenever rotating the crank by hand, it required uneven rotational force due to compression stroke. There might be uneven rotational force required to turn the cams lobes against the valve stem as well but probably much less. Not sure what are the variation of rotational forces while idling but if exist and large enough to overcome the tensioner spring force, I'd imagine we'd see what you observe. Can't confirm this is what in fact happens but thought could be a potential explanation. I guess the confirmation is to see another car. Not too hard to pull the serp belt + timing cover to see the TB tensioner in action.
    Past Volvos : 01 V70 T5, 01/02 V70XC, 02 V70 NA, 00 V70XC
    Past Others : 01/03 VW MK4 Turbo/NA/01M. Gen1 Prius, Gen1 CRV, Gen2 Rav4, 05 Accord, 08 Element, 02 Town&Country, 06 Corolla, 04 e320
    Current EV/Hybrid : 13 Tesla S85, 11 Gen3 Prius
    http://www.freewebs.com/howardsvolvos/

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