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  1. #1
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    Correct torque spec for cylinder head bolts - 250 EFI

    1B043974 Port
    1B105624 Stbd

    2005-ish 250EFI

    The service manual I have access to shows 2 different specs in 2 different places... They both agree in tightening in stages (10 lb feet in the correct pattern, then 20, etc), but for final torque, One says 20 lb feet plus 90 degrees, the other says 30 lb feet plus 90 degrees. Which is actually Correct?

  2. Mercury 3L/4 Stroke/Verado Moderator EuropeanAM's Avatar
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    Apr 2008
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    Greenville, SC (US)
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    #2
    Final two stages:

    - 20 lbs/ft

    - Additional 90 degrees

    Always use NEW head bolts.


    Dual Mercury Master Technician- for Mercury Outboards, Mercruiser and Mercury Racing at European Marine in Greenville, SC.
    Still consider myself a "Marine Apprentice" after 47 years (learn something new every day).
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  3. Member
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    Dec 2020
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    Merritt Island, FL
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    #3
    Thanks Don. I have 20 new OEM bolts in hand. Appreciate the info!