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cat oil pump

Discussion in 'Trucks [ Eighteen Wheelers ]' started by bean farms, May 6, 2012.

  1. May 6, 2012 #1
    bean farms

    bean farms Light Load Member

    118
    3
    Feb 25, 2011
    red boiling springs tn
    0
    i was wondering if you could shim the oil pump relief spring on a 3406c model it holds about 20 psi at idel i would like to see it at 30 psi at idel how do i need to go about doin this thanks
     
    bean farms, May 6, 2012
    bean farms, May 6, 2012
    #1
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  3. May 6, 2012 #2
    SL3406

    SL3406 Medium Load Member

    550
    1,492
    Jan 10, 2011
    Oklahoma
    0
    Yes I have always shimmed the spring on all of mine with washers. Unfortunately it's trial and error to get the pressure where you want it.
     
    SL3406, May 6, 2012
    SL3406, May 6, 2012
    #2
  4. May 6, 2012 #3
    bean farms

    bean farms Light Load Member

    118
    3
    Feb 25, 2011
    red boiling springs tn
    0
    what does one washer do far as pressure goes id like to get 10 psi at idel is what im goin for and the spring is the one sticking out toward the back of the motor isnt it
     
    bean farms, May 6, 2012
    bean farms, May 6, 2012
    #3
  5. May 6, 2012 #4
    SL3406

    SL3406 Medium Load Member

    550
    1,492
    Jan 10, 2011
    Oklahoma
    0
    Yes it's the spring that sticks out the back of the oil pump. I put the washers on the plunger end of the spring. It depends on how thick the washers are obviously, but it will probably take more than one to raise it 10 pounds. 20 pounds of pressure at idle is really low for a Cat. How many miles are on your rod and main bearings?
     
    SL3406, May 6, 2012
    SL3406, May 6, 2012
    #4
  7. May 7, 2012 #5
    Semi Crazy

    Semi Crazy Road Train Member

    3,033
    2,046
    May 13, 2011
    Middle Tennessee
    0
    15 is minimum spec. at operating temp.
     
    Semi Crazy, May 7, 2012
    Semi Crazy, May 7, 2012
    #5
  8. May 9, 2012 #6
    booboo

    booboo Bobtail Member

    39
    4
    Jan 17, 2009
    gainesville,ga
    0
    What rpm is it truning at idle?
     
    booboo, May 9, 2012
    booboo, May 9, 2012
    #6
  9. May 9, 2012 #7
    little cat 500

    little cat 500 Road Train Member

    2,055
    1,100
    Jan 17, 2010
    Abbottstown PA
    0
    my cat runs about 25 lbs at hot idel fresh rebuild 65 on the road
     
    little cat 500, May 9, 2012
    little cat 500, May 9, 2012
    #7
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