oil consumption after overhaul

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by 4noReason, Aug 10, 2020.

  1. 4noReason

    4noReason Road Train Member

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    i just had a overhaul on my 12.7 liter detroit 60 series. no egr. i seen my oil drop full to half on stick. should i worry? my shop said first 30k miles it will use oil.
     
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  3. lester

    lester Road Train Member

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    Have you been idling a lot? New engine needs to be ran hard to seat the rings, dont baby it and avoid idle
     
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  4. 4noReason

    4noReason Road Train Member

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    low idle. not much. i am driving a lot daily.
     
  5. Trucking in Tennessee

    Trucking in Tennessee Road Train Member

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    Takes a few miles to get the rings seated. If you are on the Interstate try to vary your RPM a bit. If it continues to lose oil I would have a compression check done.
     
  6. Rideandrepair

    Rideandrepair Road Train Member

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    It’ll burn oil, even push unburned oil, and slobber it out of exhaust connections, and blow it out of the stacks sometimes, at first. It’ll go away, as the rings wear into the cylinders and match up with the cylinder sleeves. Best to work the engine, even a little lugging is better that higher RPMs, because it causes heat, and puts more side force on the pistons. Could take up to 70k miles to fully break in. Watch fuel economy. Once the rings get seated good, It will increase, noticeably. Sometimes it’s like throwing a switch, As much as 1 mpg. New 12.7s were notorious for that, right at 70k, almost like clockwork. I’ve heard story of one that wouldn’t seal up, untill it overheated once, and after that it finally sealed up. The heat is the key, that’s why you need to work it hard.
     
    Last edited: Aug 12, 2020
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  7. 4noReason

    4noReason Road Train Member

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    hmm maybe i should go otr over hills and mountains in cali to get it hot
     
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  8. Rideandrepair

    Rideandrepair Road Train Member

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    That’s what they say, not too hot obviously. I recall a Guy once, with a old Cummins, running with a winter front, partially closed in summertime. When I asked why? He said he just did an OH, and was breaking it in. I’m not suggesting that, but from what I’ve read, more force is put on the sides of the cylinders at lower hard working RPMs. You can look it up yourself. It’s interesting.
     
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  9. Rideandrepair

    Rideandrepair Road Train Member

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    You should change oil first time at 4-6k, though, to get any debris out left behind.
     
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