2005 Volvo D12D oil level Changes.

Discussion in 'Volvo Forum' started by TruckerIgor, Feb 24, 2015.

  1. TruckerIgor

    TruckerIgor Bobtail Member

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    Feb 24, 2015
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    I have a 2005 volvo vnl670 with D12D and it has over a million miles on it. So recently I had an oil leak coming out above my oil filters, I have changed my oil with filters and the oil is still leaking from their but since then when I check my oil level it sometimes shows normal level and sometimes its lower but not critically just around the half mark. My question is does anybody know why my oil level changes or maybe it might be the problem in oil regulators above the oil filters or did anybody had this problem with their volvo as well. I have searched all over the internet and could not find anything. Now I understand if my oil level would of dropped then that means I have an oil leak but it comes back to normal mark why does that even happen? Now I do have a leak above oil filters but its not major and I can keep it under controll, I also know that It might be common that my head gasket is leaking and oil is mixing with fuel but I have just done an overhaul on my engine and replaced most of the internals so that is most likely not the case. Does anyone also have any diagrams of the whole oil system in D12 that would help a lot. Thanks
     
    Last edited: Feb 24, 2015
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  3. KW Cajun

    KW Cajun Road Train Member

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    If the oil level is at the halfway fill mark (say, down 1/2 gallon) and the next time you check it, it shows at the full line (without adding oil), then are you waiting long enough before checking the oil level after you have shut off the engine? If you check the dipstick too soon, it hasn't had a chance for the oil in the top & walls of the engine to drain into the oil pan yet. You need to wait a consistent amount of time before checking it, such as waiting 5 minutes (at minimum) each time, or better yet 1st thing in the morning when the engine has been sitting overnight. Also, the truck must be level, not on any incline or slant.

    Does the oil smell of fuel? Since you say it was recently overhauled/rebuilt, I suggest also having an oil sample analysis done. As for the filter leak, have you carefully examined the mating surface of where the filter gasket mounts. It should be smooth & clean. Make sure no old gasket material is stuck to that surface.
     
  4. TruckerIgor

    TruckerIgor Bobtail Member

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    As far as checking the oil I have been checking it for over a month, after truck has been sitting for couple of days before starting, and when ever I checked it it showed different results once in truck stop it showed full mark with the engine off for about 5 min.

    But I will for sure check if it smells like fuel.
    can it be possible the the engine has just went through an overhaul and it's kind of it's break in period the d12 do this?

    im in just very curious of why my oil level shows different reading.
     
  5. KW Cajun

    KW Cajun Road Train Member

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    The break-in period should have no effect on the oil level fluctuating. It will only have an effect on oil consumption.
    Was this a complete in-frame overhaul, where you have fresh rings & cylinder liners? How many miles are on it since the overhaul?

    In any case, the only reason that I know of fluctuating oil level would be what I told you (not waiting long enough or unlevel vehicle).

    To rule out oil dilution with fuel, take a close look & smell of the oil. Is it much thinner & 'runnier' than it should be?
    Again, an oil sample analysis may be advisable to make sure the metal contaminants & chemistry in the oil are in normal levels.
    If you rule out all of the above, then if it still fluctuates a small amount (1/2 gallon or less) then it isn't a huge concern or priority.

    Here's a link to another thread where the discussion is on proper break-in procedures. You may get some tips on break-in.
    (But this thread's OP is only concerned with his higher oil consumption during break-in)

    http://www.thetruckersreport.com/tr...r-operator/274533-oil-low-after-overhaul.html
     
  6. TruckerIgor

    TruckerIgor Bobtail Member

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    Feb 24, 2015
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    I did my over haul once she rolled over a million and on the overhaul I have replaced all internals except the pistons, piston rings and crank shaft everything else is new. After driving her for about 60,000 miles I had oil leaking out of my rings Into the combustion but only when the engine is cold, when it's warmed up and remains it's operating temp the leak stops, I did a compression test to prove that and it turned out to be low compression in cylinder 1 and 4.
    I am thinking that maybe the oil sometimes enters the combustion through the rings and that mightn't be the problem. But I still don't understand why sometimes I just have oil on full mark and them it goes away.

    Do you by a chance have oil diagram of d12? so I can see how the system works especially on the filter part.
     
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