Cat 3406B fluctuating oil pressure again.

Discussion in 'Trucks [ Eighteen Wheelers ]' started by Rick Wilmath, Jul 19, 2017.

  1. Jul 19, 2017 #1
    Rick Wilmath

    Rick Wilmath Light Load Member

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    I am driving a 1993 Freightliner with a Cat 3406b and last week the oil pressure would go down to 30psi when it
    was idling and then come back to about 48psi when driving. At the same time the motor started running a little rough.
    I changed the oil and oil filter and the pressure bounced back immediately and the motor was running much smoother-for three carefree days. Today it started doing the same thing. When idling it goes to 30 psi and on the road it goes up to 48psi.

    Any ideas?
    Thanks
     
    Rick Wilmath, Jul 19, 2017
    Rick Wilmath, Jul 19, 2017
    #1
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  3. Jul 19, 2017 #2
    baha

    baha Road Train Member

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    Send off a oil sample to ck for fuel in the oil?
     
    baha, Jul 19, 2017
    baha, Jul 19, 2017
    #2
    Rick Wilmath Thanks this.
  4. Jul 19, 2017 #3
    bigguns

    bigguns Road Train Member

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    When did it last have bearings rolled in?
     
    bigguns, Jul 19, 2017
    bigguns, Jul 19, 2017
    #3
    Rick Wilmath Thanks this.
  5. Jul 19, 2017 #4
    kranky1

    kranky1 Road Train Member

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    Doesn't seem too out of line to me if the engine has any amount of miles/hours on it. Most of them would only run 58psi hot when they were fresh. We used to run them down to 25psi at low idle before rolling shells into them.
     
    kranky1, Jul 19, 2017
    kranky1, Jul 19, 2017
    #4
    Rick Wilmath Thanks this.
  7. Jul 19, 2017 #5
    Rick Wilmath

    Rick Wilmath Light Load Member

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    I recently bought the truck. It has 2million miles on it so I don't have any idea when bearings were last installed.

    I haven't sent in an oil sample yet but that seems like a good idea. I just changed the oil, how long should I wait before I can send in a sample?

    Thanks Kranky1 I would like to get a few more miles out of it before I do an inframe.
     
    Rick Wilmath, Jul 19, 2017
    Rick Wilmath, Jul 19, 2017
    #5
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