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rattle with engine under load

Discussion in 'Trucks [ Eighteen Wheelers ]' started by deereman6030, Sep 28, 2012.

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  1. Sep 28, 2012 #1
    deereman6030

    deereman6030 Bobtail Member

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    Sep 27, 2012
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    ok this is whats goin on 3 mo ago i had this rattle start, this is what it does oil has 2 get 2 about 150 water gets 150 the truck has 2 get warmed up out on the interstate. when the truck starts 2 pull a grade it will start a rattle around 1500 to 1700 rpm. it sounds like a bearing. checking tolerence on pto today. oh yea truck is pete with n14 super 10 w air leaf suspension. ok this is whats bn replaced. clutch pilot bearing clutch brake. carrier bearing. tranny(used but truck does exact same as b4 swap) any help would be appreciated
     
    deereman6030, Sep 28, 2012
    deereman6030, Sep 28, 2012
    #1
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  3. Sep 28, 2012 #2
    Oscar the KW

    Oscar the KW Going Tarpless

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    Are you sure the rattle is with the engine? Any experience I have had with a bad bearing (gas or diesel) has been a knock not a rattle.
     
    Oscar the KW, Sep 28, 2012
    Oscar the KW, Sep 28, 2012
    #2
  4. Sep 28, 2012 #3
    deereman6030

    deereman6030 Bobtail Member

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    Sep 27, 2012
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    its like shaking a wore out bearing w ur hand how it has alot of slack and its realy loud when im pulling a hill in the higher gears. does it most around 1800 rpm. i think its in the drive train some where. its not a knock or a ringing but kinda in between.
     
    deereman6030, Sep 28, 2012
    deereman6030, Sep 28, 2012
    #3
  5. Sep 28, 2012 #4
    JohnP3

    JohnP3 Road Train Member

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    Rock Creek B.C. Canada
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    When you change the oil punch the oil filter, and let it drain then cut the top off, and look at the paper for metal flakes, also use a magnet. Inspect the drain plug also.
    At an Idle using a bar against you skull, you can listen to the cam boxes for a bad roller.
     
    JohnP3, Sep 28, 2012
    JohnP3, Sep 28, 2012
    #4
    deereman6030 Thanks this.
  7. Sep 28, 2012 #5
    Superhauler

    Superhauler TEACHER OF MEN

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    keep stroking.
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    i went through this a while ago. my rattle ended up being a loose exhaust band clamp.when i would get in a hard pull i thought the truck was going to fly apart.
     
    Superhauler, Sep 28, 2012
    Superhauler, Sep 28, 2012
    #5
    deereman6030 Thanks this.
  8. Sep 28, 2012 #6
    deereman6030

    deereman6030 Bobtail Member

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    Sep 27, 2012
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    oil filter was fine no signs of metal. i realy dont think it is an engine issue. i will check all my exhaust tomarrow. thanks for the suggestions. could the ride height be causing the drive line to bind?
     
    deereman6030, Sep 28, 2012
    deereman6030, Sep 28, 2012
    #6
  9. Sep 28, 2012 #7
    bender

    bender Road Train Member

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    Don't Kid Yourself
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    How about a broken baffle in muffler? I've seen it before and it showed the strongest in top gear in a hard pull.
     
    bender, Sep 28, 2012
    bender, Sep 28, 2012
    #7
  10. Sep 29, 2012 #8
    truckmechanic

    truckmechanic Medium Load Member

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    Jan 14, 2012
    Hi Desert Ca
    0
    Is it a loud knock? Sounds like your about to drop a piston I have chased this down on cummins m11 and n14 a few times its fuel knock its hard to pin point and most of the time they will pass a injector test normally its caused by the injector being damaged internal and a few times I have found injectors with broken springs!!
     
    truckmechanic, Sep 29, 2012
    truckmechanic, Sep 29, 2012
    #8
    deereman6030 Thanks this.
  11. Sep 29, 2012 #9
    deereman6030

    deereman6030 Bobtail Member

    33
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    Sep 27, 2012
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    with the shifter boot out u can hear a slight tapping that follows the rpms. the main problem isnt realy a knock a very loud rattling sound that comes up through the shifter it gets so loud when pulling a hill it will drown out the radio. its not like an exhaust rattle all of that is tight checked today and ride hieght is 12.5 from weld on axle 2 bottom frame rail
     
    Last edited: Sep 29, 2012
    deereman6030, Sep 29, 2012
    deereman6030, Sep 29, 2012
    #9
  12. Sep 30, 2012 #10
    truckmechanic

    truckmechanic Medium Load Member

    534
    140
    Jan 14, 2012
    Hi Desert Ca
    0
    Sounds like might be an injector I went the same thing the first time I came across this problem checked the truck out inspected trans,diffs,suspension,cab mounts its like a realy load rattle its hard to describe let off the long pedal it goes away get back in it and there it is. Might be worth pulling the valve covers and jakes and seeing if you can see a broken injector spring or sometimes you can find it with a heat gun on the manifold might be hotter or colder on that cyl.can you get it to rattle if you put it on gear with brakes set and power brake it?that is how I finally found out where it was coming from
     
    truckmechanic, Sep 30, 2012
    truckmechanic, Sep 30, 2012
    #10
    deereman6030 Thanks this.
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