trucking251 Posted November 4, 2023 Share Posted November 4, 2023 I have a 2005 CV713 with AI400 motor. I have oil spraying all over passenger side under turbo. I clean it all up and run it and don't see a drop of oil, but then drive it for awhile and everything covered again. I've replaced o-ring on down tube from turbo, almost positive that's where it's coming from. I believe it's a very intermittent pressurized release of oil from there. What would cause random pressure in the motor? Turbo was replaced 60,000 miles ago. Quote Link to comment https://www.bigmacktrucks.com/topic/73499-mack-granite-oil-blowing-from-turbo-down-tube/ Share on other sites More sharing options...
Joey Mack Posted November 5, 2023 Share Posted November 5, 2023 take the overboard breather out and see if its plugged with sludge.. have you replaced the oval gasket where the oil return tube bolts to the turbo? What shape is the oil feed hose to the top of the turbo? Nice picture, I have been to the top of Mt. Washington twice.. not hiking,, driving the auto road.. Once on a motorcycle.. Awesome !! Quote Link to comment https://www.bigmacktrucks.com/topic/73499-mack-granite-oil-blowing-from-turbo-down-tube/#findComment-541442 Share on other sites More sharing options...
trucking251 Posted November 5, 2023 Author Share Posted November 5, 2023 I've checked breather several times, I got the factory o'ring where down tube goes into oil fill tube. I just don't think it's meant to hold any kind of pressure there, just if oil splashed up. Quote Link to comment https://www.bigmacktrucks.com/topic/73499-mack-granite-oil-blowing-from-turbo-down-tube/#findComment-541482 Share on other sites More sharing options...
Joey Mack Posted November 5, 2023 Share Posted November 5, 2023 its not pressurized. it just returns oil from the turbo bearings.. Can you take pictures and post them? The only pressurized oil line is the feed line to the turbo, on that side of the engine.. the lower exhaust studs leak after a while. Quote Link to comment https://www.bigmacktrucks.com/topic/73499-mack-granite-oil-blowing-from-turbo-down-tube/#findComment-541484 Share on other sites More sharing options...
trucking251 Posted November 6, 2023 Author Share Posted November 6, 2023 I understand that. It's acting like it's randomly getting pressurized, like crankcase pressure. you can Idle for an hour after washing oil off and not see a drop, but then drive for awhile and be covered again. It's not a constant. Quote Link to comment https://www.bigmacktrucks.com/topic/73499-mack-granite-oil-blowing-from-turbo-down-tube/#findComment-541505 Share on other sites More sharing options...
Joey Mack Posted November 6, 2023 Share Posted November 6, 2023 Pictures would be helpful... Quote Link to comment https://www.bigmacktrucks.com/topic/73499-mack-granite-oil-blowing-from-turbo-down-tube/#findComment-541507 Share on other sites More sharing options...
Onyx610 Posted November 6, 2023 Share Posted November 6, 2023 O-ring is torn Quote Link to comment https://www.bigmacktrucks.com/topic/73499-mack-granite-oil-blowing-from-turbo-down-tube/#findComment-541510 Share on other sites More sharing options...
trucking251 Posted November 6, 2023 Author Share Posted November 6, 2023 what O-ring? I put brand new one on down tube from dealer. I will take pictures Today. Quote Link to comment https://www.bigmacktrucks.com/topic/73499-mack-granite-oil-blowing-from-turbo-down-tube/#findComment-541522 Share on other sites More sharing options...
fjh Posted November 6, 2023 Share Posted November 6, 2023 I think you will find that your turbo is fubar ! Regardless of its age! we had run into this on many occasions ! when warm / hot Pressure builds up on the exhaust side of the turbo under load and moves down the turbo shaft to the drain tube causing base pressure! But another question ! have you been backing up hill alot ! if so there is a kit to move the breather to the valve cover for cases like this happened a lot with mixer trucks and some dump apps when working on adverse! just sayin! 2 Quote Link to comment https://www.bigmacktrucks.com/topic/73499-mack-granite-oil-blowing-from-turbo-down-tube/#findComment-541530 Share on other sites More sharing options...
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