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D12D Engine Leak

Discussion in 'Volvo Forum' started by 8080, Sep 7, 2011.

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  1. Sep 7, 2011 #1
    8080

    8080 Bobtail Member

    23
    3
    Aug 19, 2011
    Dallas, Texas
    0
    I have a 2007 780 with a D12D motor with a pretty serious coolant leak on top of the motor. Several weeks ago I had a new radiator installed. After it was installed a series of leaks began. I replaced all hoses that I can find that are pressure hoses dealing with the cooling system. The motor idles with no leaks. When I get under a load, or even when empty, and start putting stress on the motor coolant begins to blow from the motor. When opening the hood, I can see spray on the inside of the hood right over the top cover, or rocker arm cover; I call it.

    Is there another pressure line for the coolant system that I have missed that would put coolant on top of the motor? Right now I am losing about 1/4 gallon of coolant daily.
     

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    8080, Sep 7, 2011
    8080, Sep 7, 2011
    #1
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  3. Sep 8, 2011 #2
    The_Judge

    The_Judge Light Load Member

    257
    68
    May 25, 2008
    Montreal, Quebec
    0
    To me it looks like oil splash not coolant. But anyway, try to let the hood open somewhere into an empty truckstop or some wide open space and apply the trailer brakes and start moving the truck slow(like it would be a loaded trailer) and then go to the engine and check which pipe is leaking.
    The way it looks in the pics there is a biiiiig hole somewhere not a leak.
    Did u check the EGR cooler? I replace two of them on my truck and I know there are very leak-able and break-able.
     
    The_Judge, Sep 8, 2011
    The_Judge, Sep 8, 2011
    #2
    8080 Thanks this.
  4. Sep 8, 2011 #3
    Pablo-UA

    Pablo-UA Road Train Member

    7,604
    1,640
    Oct 11, 2010
    Borispol, Ukraine
    0
    it looks like bad front cranck seal, ore valve cover. It must be a big leak! So many drops everywhre becouse fan blows))

    I use to put some powder on oil and run engine to see the point of leak. Do not use high pressure wash there!
     
    Pablo-UA, Sep 8, 2011
    Pablo-UA, Sep 8, 2011
    #3
  5. Sep 10, 2011 #4
    8080

    8080 Bobtail Member

    23
    3
    Aug 19, 2011
    Dallas, Texas
    0
    I appreciate your replies. I have a small oil leak on the top cover. I was told it wasn't worth the 1800 dollar fix. Just found that my water pump is blowing the water out the side of the motor. The fan comes on and catches it all and makes a serious mess. Engine runs fine despite looking so ugly.
     
    8080, Sep 10, 2011
    8080, Sep 10, 2011
    #4
  7. Sep 12, 2011 #5
    Manny129

    Manny129 Light Load Member

    150
    25
    Aug 16, 2010
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    You should be able to find a new oil cover at a junkyard.
     
    Manny129, Sep 12, 2011
    Manny129, Sep 12, 2011
    #5
    8080 Thanks this.
  8. Sep 13, 2011 #6
    Pablo-UA

    Pablo-UA Road Train Member

    7,604
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    Oct 11, 2010
    Borispol, Ukraine
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    it is made of plastic and may be fixed with polyether. But clean well, remove oil with solvent for paint
     
    Pablo-UA, Sep 13, 2011
    Pablo-UA, Sep 13, 2011
    #6
  9. Sep 14, 2011 #7
    8080

    8080 Bobtail Member

    23
    3
    Aug 19, 2011
    Dallas, Texas
    0
    Thanks guys. Just found that it is not even the water pump. Its not the egr cooler neither. And I had all hoses replaced. I guess replacing the resevoir is next. I ran the truck at the maintenance shop for 8 hours at high idle. No leak showed up. Frustrating :biggrin_25510:
     
    8080, Sep 14, 2011
    8080, Sep 14, 2011
    #7
  10. Sep 15, 2011 #8
    motormania

    motormania Bobtail Member

    3
    2
    Aug 16, 2011
    montreal, quebec
    0
    Take a look at the thermostat housing as well. There are 3 long bolts keeping the thing tighten onto the gasket and it takes a Volvo tool to install it or you can use a pry bar instead.
    On top of the tank you can install a cap with a tire valve and pressurize the cooling system at about 14-15 PSI and check for leaks.
     
    motormania, Sep 15, 2011
    motormania, Sep 15, 2011
    #8
    8080 Thanks this.
  11. Sep 17, 2011 #9
    8080

    8080 Bobtail Member

    23
    3
    Aug 19, 2011
    Dallas, Texas
    0
    Thanks for your reply Mania. I think you got it right on point. The thermostat gaskets is what everyone, to include myself, has been over looking. I think ill just take it to volvo and tell them to seal my cooling system. Im losing alot of money atm trying to run short to stay near home. We will see what happens tomorrow or monday morning. Thanx again.
     
    8080, Sep 17, 2011
    8080, Sep 17, 2011
    #9
  12. Sep 23, 2011 #10
    8080

    8080 Bobtail Member

    23
    3
    Aug 19, 2011
    Dallas, Texas
    0
    Hello everyone,
    I fixed the leak which was blowing water all over the motor. However, I am still losing water from my resevoir. I am not getting any white smoke from the exhaust pipes or any water leaking on the ground. My question is.. What coolant leak can occur with absolutely no visible signs. Also, I had a test done on my coolant system and it shows there is no fuel or oil contamination and there is no water in my oil system.

    Injector cups maybe? If so, how difficult is it to change them out myself and what are the procedures?
     
    8080, Sep 23, 2011
    8080, Sep 23, 2011
    #10
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