Talk Morgan Forums Morgan Sports Cars Maintenance & Servicing Workshop Note - GDI Oil Breather

Oh, and for all who did not notice yet (hard to follow with all the different threads on this topic): there are two (!) ventilations; one from the where the cam shafts (overhead cams, so on top of the engine) do their work, and another one from the crankcase, at the bottom of the engine, "cold side".

- The first ventilation goes into the fresh air hose just before the throttle body and is pretty much dry, so no threat from that.
- The other one though is all oily, and - as you can see in my video - quite hard to get to.

But it is possible, just follow the instructions (and always disconnect the battery first) and you'll get there. From what I have seen so far, installing an oil catch can makes perfect sense. And by the way, with all that stuff removed from the engine bay, you get a real good chance to do some proper cleaning

Very well done Robert, excellent job & video.

Look forward to the next instalment and hope you have no issues putting it all back together. I saw a video of someone who cleaned the back of the valves one at a time by manually turning the engine until a valve in a cylinder was Closed, then soaking the back of the valve in cleaner (half an hr) and then soaking up the cleaner with paper towels, probably worth doing before you put it back together.

Best Regards.

How does the crankcase breather attach to the manifold Robert? Is is a push fit or a turn and lock? Now I can feel it, there may be scope to make changes from underneath.

Excellent video, and sure to be of use to many others. I was quite surprised at the amount of muck on the valves after less than 10k miles. Yet another reason to go for a Duratech rather than GDI, in the used car market?

I managed to work out the breather connection is a squeeze and pull removal. So today I uncoupled it. Access is tight from above, and working blind after scoping it out with a torch and mirror.

To blank off the hole in the inlet manifold, which is a short plastic tube, I turned down a short length of rubber hose using my electric drill, and some wet and dry. Once that was a snug fit, I glued a bolt and washer over the end to stop the tube getting inside the manifold.

With regard to the disconnected breather tube, access is so tight that it's almost impossible to do much with it, without removing the inlet manifold, so for now I've left it disconnected and venting to atmosphere. It would be simple to reattach if necessary.

But Dave, the environment
Catch can is now installed as well, I'll check after a few hundred kms and let y'all know!

Hi Robert,

very good report and video! I‘m shocked about the valves look! As I also see it‘s a 2018 car. With how many kilometers/ miles at the clock?

It looks like a job for the next hibernation.

Greets René

Rene, this is done in less than a day, trust me! And from some of your posts I have the feeling you do have the skills My Mog's got a little more than 15.000km on the clock, so not really that much - and there were quite a few long distance trips that I have done, so too much short distance travel can't be the major reason.
I am considering a professional walnut blasting now that the catch can is installed, just to get it properly cleaned once. Anyway, looking at the intake valves will now become one of my regular inspections.

Hi, Robert,

15000KMs! My car is also a 2018 with 26.000KMs on the clock. So there would be some bricks on the valves. Sounds not good.

Walnut blasting sounds interesting. So you tow the MOG to a man who can (and will) do it? And for the rebuild: the intake and the throttlebody needs a specific torqueseeting (and a new seal). Which torque? And which seal? Looking for the summer, but a little sceptical.
Next hibernation and undo the head?

Greets René

Could be worse. These were the exhaust valves from the Standard Ten engine in the Fairthorpe Electron Minor I drove in the late-60's.(Surprisingly, the engine would still run). I learned how to lap valves, and kept them as a desk trophy to remind me to fix things before they get really bad !