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Thread: Cat thirty head gasket nut torque

  1. #1
    Join Date
    Nov 2006
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    Default Cat thirty head gasket nut torque

    Does anyone have a good figure for the torque? I have seen some general charts, but thinking that these 3/4" old nuts/studs don't need the full torque of a modern engine.
    What would be sensible?
    D2 5u & 3J
    212 9T
    RD4
    D4 7J & 7U
    R4 4G
    Gas 35's
    Diesel 35
    Diesel 40
    Gas 50's 5A
    Diesel 50 1E1755
    Diesel 75
    D 8800 power unit 9J 6113SP
    LeTourneau D4 tournapull/Q Carryall
    Letourneau D Carryall's
    LaPlant-Choate CAB-97

  2. #2
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    Pioneer Valley, Western MA
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    Stephen, I find that the settings Cat used years ago matched a grade 5 torque That is what I put on my 30 when I did it.
    Herb
    USA M2 5E3562SP

  3. #3
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    Default

    Quote Originally Posted by HFDZL View Post
    Stephen, I find that the settings Cat used years ago matched a grade 5 torque That is what I put on my 30 when I did it.
    Herb, do you recall what was that grade 5 torque figure ?
    Thanks
    D2 5u & 3J
    212 9T
    RD4
    D4 7J & 7U
    R4 4G
    Gas 35's
    Diesel 35
    Diesel 40
    Gas 50's 5A
    Diesel 50 1E1755
    Diesel 75
    D 8800 power unit 9J 6113SP
    LeTourneau D4 tournapull/Q Carryall
    Letourneau D Carryall's
    LaPlant-Choate CAB-97

  4. #4
    Join Date
    Apr 2007
    Location
    Pioneer Valley, Western MA
    Posts
    215

    Default

    Here is the secret Cat specs 'Do not divulge to mere mortals that do not own Caterpillar !!!'

    The second list is the Cat one, the first is general torque settings
    Attached Images Attached Images
    Last edited by HFDZL; 06-05-2019 at 04:02 PM.
    Herb
    USA M2 5E3562SP

  5. #5
    Join Date
    Nov 2007
    Location
    NW Ohio
    Posts
    3,232

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    That does not apply to all Cat bolts though! Later machines have different torques for certain applications. I just installed a track frame on a late 955L, the service manual called for 630 +- 50 ft lbs torque for the 7/8" bolts.

  6. #6
    Join Date
    Nov 2006
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    McBEE, SC
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    Default

    Quote Originally Posted by Rome K/G View Post
    That does not apply to all Cat bolts though! Later machines have different torques for certain applications. I just installed a track frame on a late 955L, the service manual called for 630 +- 50 ft lbs torque for the 7/8" bolts.
    That is what I'm saying "horses for courses "
    D2 5u & 3J
    212 9T
    RD4
    D4 7J & 7U
    R4 4G
    Gas 35's
    Diesel 35
    Diesel 40
    Gas 50's 5A
    Diesel 50 1E1755
    Diesel 75
    D 8800 power unit 9J 6113SP
    LeTourneau D4 tournapull/Q Carryall
    Letourneau D Carryall's
    LaPlant-Choate CAB-97

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