As I mentioned yesterday, no jeep work today. My wife’s 153K mi 2017 BMW X3 has had a developing oil leak for at least a year. I initially noticed some oil coming from somewhere higher in the engine several oil changes ago. It wasn’t enough to drop the level or even hit the floor so, since I didn’t easily see the source, I watched and waited for it to declare itself. It ultimately did. A couple of weeks ago, a burning oil smell began to be noticeable, suggesting oil hitting the exhaust. Another look still wasn’t immediately revealing (here’s the N55 3.0 turbo 6 with the cover off):
I’ll talk about the yellow arrow in a sec but you can see how much stuff on top of the engine needs to move to pull the valve cover. It is leaned over to passenger with that being the hot side. The internet said valve cover gasket leaks are fairly common in aged N55s and that made sense since it would dump oil on the exhaust manifold and turbo. I don’t have a good pic but it seemed like there was some seepage at least in the area. So I ordered an OEM gasket set (only $43, if you can believe that). 2 hours in, here’s the cover off:
The red arrow shows the low side with oil pretty much covering the head outside the gasket (and draining down to the exhaust manifold and turbo). I was feeling good about my diagnosis at this point.
Now back to the yellow arrow in the first pic. There were about a million electrical connectors and vacuum lines plus the fuel rail and coil packs to remove. This is not my first rodeo so I knew something, or multiple somethings would break on this old thing, no matter how careful I was. Fortunately, the only casualty was a breather from the intake to the valve cover. VERY brittle.
But, no matter, a little 3/4” hose fixed the issue.
And its all back together. No oil or gas leaks. No codes. I warmed it up and then changed the oil. I’ll leave the engine cover off for a few days while I monitor for fuel or oil leaks and any other issues.
Now back to the TJ…