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FH12-D12D-420 Crankcase Pressure Problem

Discussion in 'Volvo Forum' started by Amushonga2000, Mar 19, 2014.

  1. Mar 19, 2014 #1
    Amushonga2000

    Amushonga2000 Bobtail Member

    16
    0
    Jan 26, 2014
    Johannesburg, South Africa
    0
    Truck starts and runs well but when sufficiently warmed up, crankcase sensor reports and shuts down the engine. I have had the truck serviced recently and changed the crankcase sensor and the oil pressure sensor - no change. What are the possible causes, any pointers?
     
    Amushonga2000, Mar 19, 2014
    Amushonga2000, Mar 19, 2014
    #1
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  3. Mar 19, 2014 #2
    bad-luck

    bad-luck Road Train Member

    3,379
    6,262
    Nov 16, 2013
    Baltimore, Maryland
    0
    How many miles? It could possibly be excessive blow by.
     
    bad-luck, Mar 19, 2014
    bad-luck, Mar 19, 2014
    #2
  4. Mar 19, 2014 #3
    jameslawton

    jameslawton Light Load Member

    257
    65
    May 1, 2013
    Tulsa OK
    0
    Is there a crank case filter on the truck if they get full of oil it will turn on check engine light
     
    jameslawton, Mar 19, 2014
    jameslawton, Mar 19, 2014
    #3
  5. Mar 19, 2014 #4
    Amushonga2000

    Amushonga2000 Bobtail Member

    16
    0
    Jan 26, 2014
    Johannesburg, South Africa
    0
    Mileage is about 500000 miles
     
    Amushonga2000, Mar 19, 2014
    Amushonga2000, Mar 19, 2014
    #4
  7. Mar 21, 2014 #5
    Pablo-UA

    Pablo-UA Road Train Member

    7,604
    1,642
    Oct 11, 2010
    Borispol, Ukraine
    0
    first of all check crancase vent tubes, if they are ok I sugest bad crankcase sensor ore bad wiring. Usually bad sensor, spring inside it goes weak and it reads more pressure.

    really U can disconnect this sensor and ignore fault code, but if crankcase vent is clogged u may get valve cover blown)))
     
    Pablo-UA, Mar 21, 2014
    Pablo-UA, Mar 21, 2014
    #5
    Amushonga2000 Thanks this.
  8. Mar 21, 2014 #6
    Amushonga2000

    Amushonga2000 Bobtail Member

    16
    0
    Jan 26, 2014
    Johannesburg, South Africa
    0
    Will check wiring - replaced oil pressure sensor, crankcase sensor, put in new oil pump, checked bearings as well. It has to be an electrical fault, it's reporting crankcase pressure, oil pressure and lack of oil. Will have harness checked. Thanks Pablo.
     
    Amushonga2000, Mar 21, 2014
    Amushonga2000, Mar 21, 2014
    #6
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