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Replacing front main seal on 3406 Cat, possibly the Front timing cover.

Discussion in 'Trucks [ Eighteen Wheelers ]' started by truckman29801, Dec 5, 2013.

  1. Dec 5, 2013 #1
    truckman29801

    truckman29801 Medium Load Member

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    Mar 10, 2013
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    My front main seal drips , doesnt leave a puddle. How do i change the front main seal on a 3406E CAT and is it like any other engine front main? does the front cover have to come off? and will i need any special tools? and will i have to retime the Engine? Its not a priority but i would like to keep a tight truck. Ive done a Detroit 12.7 before. Oh does the 3406 Leak at the front cover alot? it might not be the seal because when i let it run at about 1500 rpms its not leaking nor wet, but right under the seal is wet
     
    truckman29801, Dec 5, 2013
    truckman29801, Dec 5, 2013
    #1
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  3. Dec 5, 2013 #2
    wore out

    wore out Numbered Classic

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    CHASIN THE DEVIL'S HERD
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    If you have done a detroit you can do a cat same procedure just different size tool. Yea the covers will leak I might really get a good look before I put a seal in.
     
    wore out, Dec 5, 2013
    wore out, Dec 5, 2013
    #2
  4. Dec 6, 2013 #3
    Lewis9698

    Lewis9698 Bobtail Member

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    Dec 2, 2013
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    I agree with wore out there is a Cat front specific seal tool I just did mine along with the Bull gear and Idlers 1.5 million on it. Doing just the seal is a job only because of where it is ie. NO ROOM good luck
     
    Lewis9698, Dec 6, 2013
    Lewis9698, Dec 6, 2013
    #3
  5. Dec 6, 2013 #4
    truckman29801

    truckman29801 Medium Load Member

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    Mar 10, 2013
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    Well i was gonna take the nose off real quick and pull the harmonic balancer and pull the other one out. Im not entirely sure its the Front main though.
     
    truckman29801, Dec 6, 2013
    truckman29801, Dec 6, 2013
    #4
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