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  1. #1
    Seaman Apprentice
    Join Date
    Jul 2001
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    wiltshire,england
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    40

    Default Torque settings for mercruiser 120?

    any help greatfully recivedhave a 1978 153 CID mercruiser inboard which i am stripping down to overhaul, but have no manual for torque setting.if you can help i needhead settings and sequencebig end and mains settingsinlet and exhaust valve clearance and how to set (hot/cold running or static)the book code the ISBN no. of the back of a manual next to the bar code, for this engine would be even better as i can order onethanks again

  2. #2
    Seaman Apprentice
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    Jul 2001
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    wiltshire,england
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    40

    Default Re: Torque settings for mercruiser 120?

    sorry forgot to mention its a GM 4 cyl.

  3. #3
    Captain
    Join Date
    Nov 2001
    Location
    Southern Alabama
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    3,333

    Default Re: Torque settings for mercruiser 120?

    Cylinder head torque is 93 ft lbs.10 6 2 3 79 5 1 4 8Valve setting is one turn down from zero lash.Valve face angle is 45 degrees for both. Seat angle is 46 degrees.Main bearing cap 65 ft lbsManifold to head 23 ft lbsRods (11/32-24) 33 ft lbsRods (3/8-24) 40 ft lbsWhat else you need?

  4. #4
    Seaman Apprentice
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    Jul 2001
    Location
    wiltshire,england
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    40

    Default Re: Torque settings for mercruiser 120?

    thanks for you help can you run me through the valve clewrance setting as most of the engines ive worked on have been overhead cam with hydralic tappits.the last thing i worked on with ohv was about 15 years ago

  5. #5
    Petty Officer 1st Class
    Join Date
    Aug 2002
    Location
    Brookfield, WI
    Posts
    271

    Default Re: Torque settings for mercruiser 120?

    getting a manual before an overhaul would be ideal since all of this info and more is in there. I have the same motor and invested in the service manual.

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