Oil leak in cylinder head

by Miguel Reyes in 912 / 914 Technical Questions 11 years ago

I have a 912 ULS mounted on a Tecnam Eaglet with 100 hrs. Apparently there is a small leak where the oil return tube enters the valve cover area in cylinder #2. From what I have been told I have to replace the oil return tube and apply Loctite sealant to correct this. Any suggestions before doing this?

Re: Oil leak in cylinder head

by Rob Seaton » 11 years ago

Rob Seaton

3 1.32k 251

The tube can be re-used but they are pretty easy to damage during removal.
-remove the head and heat the tube/head area with a propane torch or heat gun until the loctite turns dark- approx 250F. Use a thick leather glove to twist the tube and pull out gently. Try not to bend the tube. scrap/clean all the old loctite off both surfaces, this is an important step. Apply a small amount of 648, do not substitute with anything else, to the tube and insert fully into head. verify the tube has bottomed out by looking into the bore from the rocker arm side. If the tube does not fit snugly you can swell it up slightly with a socket. Let it sit undisturbed for 12 hours to cure.
For re-installation make sure the o-rings are placed onto the tube AFTER sliding the tubes past the cylinder fins (so they don't get damaged/cut by the fins). Squeeze the head and cylinder together and push both into place, at the same time keep an eye on the o-rings so they don't poop out.
Of course there is a lot more to re/re the head but this is just a few tips for the tube itself.

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