Cannot tighten flywheel bolts anymore

Discussion in 'Ask An Owner Operator' started by MyLotion, Jun 29, 2022.

  1. MyLotion

    MyLotion Bobtail Member

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    Per the Volvo service manual of a 2006 D16 Volvo VT880, the flywheel bolts should be torqued to 44ft +- ft/lb and then another 120 +- 10 degrees. I am only able to make it to about 60 degrees after applying the 44ft/lbs of torque.

    Is this fine? Am I to apply blue loctite to these bolts as well?
     
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  3. roundhouse

    roundhouse Road Train Member

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    You using new bolts ?
    Or reusing the old bolts ?

    Do the specs call for new bolts ?
    Alot of the later model stuff requires new bolts because the old ones are designed to stretch .
     
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  4. AModelCat

    AModelCat Road Train Member

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    Not to be a smart### but if it says 120 degrees, I'd make sure its 120 degrees. If 60 degrees were fine, the manual would have said 60.
     
  5. MyLotion

    MyLotion Bobtail Member

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    I am using the old bolts
     
  6. MyLotion

    MyLotion Bobtail Member

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    And nothing in the manual calls for new ones
     
  7. MyLotion

    MyLotion Bobtail Member

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    You dont sound like a ######## at all. I agree with you. I feel like I'm going to snap a bolt if I go any farther.
     
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  8. REALITY098765

    REALITY098765 Road Train Member

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    What is a torque-to-yield bolt? It is a one-time-use fastener that is designed to stretch during the torquing process (installation). Because of this stretching, the integrity of the bolt is compromised. These bolts cannot and should not be reused due to the stress caused to the bolt during its first installation.Feb 12, 2020
     
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  9. Elroythekid

    Elroythekid Road Train Member

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  10. Nostalgic

    Nostalgic Road Train Member

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    Another thing to add, since I have no clue how much experience or knowledge you have, but 120 degrees is just 2 flats. I may or may not know a guy that got confused on that stuff in his younger years and wondered why he was breaking bolts lol. 44ft lbs and 2 flats is probably going to land somewhere around 150-200 ft lbs if my guestimation is close.
     
  11. buddyd157

    buddyd157 Road Train Member

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    those are "torque to yield" fasteners (or bolts) they came out decades ago, when i was turning wrenches, and many mechanics were reusing them, and had HUGE problems with them breaking.......

    always buy FACTORY NEW from the dealership NEVER from eBay or anyplace else that might sell you Chinese made ones.
     
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