Jabiru oil leak resolved

Jabiru 2200 / 3300 discussions

Jabiru oil leak resolved

Postby fastj22 » Wed Mar 25, 2020 6:25 pm

For years, I've chased a small oil leak on my Jabiru3300. The symptom was a misting oil somewhere near the prop hub and would mess up the cowl and all things past it. Not much, just a mess. I suspected the oil pump cover and removed, cleaned and resealed with the indicated goo. Still no joy. After the B-model conversion and the engine sitting for a year, the leak got worse. now I was blowing an ounce per hour into the cowl. Removed the oil pump cover, resealed with PermaTex. well that worked, not in that it sealed the cover, but blew out and made it very apparent where the leak was coming from. Again remove, clean and apply the correct anaerobic sealant (Loctite 515 and 7649 primer) called out in the manual. This time it worked. Not a drop or a mist. Persistence paid off.

John Gillis
SEL Private, Comm Glider, Tow pilot (Pawnee Driver)
Waiex N116YX, Jabiru 3300, Tail dragger,
First flight, 3/16/2013. 403 hours and climbing.
Home: CO15. KOSH x 5
Flying a B-Model Conversion (Super Bee Baby!)
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Re: Jabiru oil leak resolved

Postby Sonex1517 » Wed Mar 25, 2020 7:55 pm

Thanks for posting this John. I’m suspicious I have a very similar leak. Based on what I see this could be the cause.
Robbie Culver
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First flight 10/10/2015
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Jabiru 3300 Gen 4
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Re: Jabiru oil leak resolved

Postby fastj22 » Thu Mar 26, 2020 10:24 am

There are actually two seals on the cover. The cover itself has an o-ring. The pump plate that the gears orbit in is a metal to metal seal against the case. This is the one that was leaking. If you don't get right amount of goo or the surfaces are not prepped properly or for pete's sake you use the wrong goo, the pressure will blow past this. I suspect the sealant cracks over time and allows a small seep of oil to escape at fairly high pressure thus misting it. Note: read the maintenance manual prior to taking this apart. Things go back together in a specific orientation and there's a woodruff key that will surely try to escape.

John Gillis
SEL Private, Comm Glider, Tow pilot (Pawnee Driver)
Waiex N116YX, Jabiru 3300, Tail dragger,
First flight, 3/16/2013. 403 hours and climbing.
Home: CO15. KOSH x 5
Flying a B-Model Conversion (Super Bee Baby!)
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Re: Jabiru oil leak resolved

Postby Sonex1517 » Mon May 04, 2020 12:57 pm

John

I didn’t find the reference in the maintenance manual. Which section or page should I be looking for?

Thanks
Robbie Culver
Sonex 1517
Aero Estates (T25)
First flight 10/10/2015
375+ hours
Jabiru 3300 Gen 4
Prince P Tip
Taildragger
N1517S
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Re: Jabiru oil leak resolved

Postby sonex892. » Mon May 04, 2020 6:24 pm

Sonex1517 wrote:
I didn’t find the reference in the maintenance manual. Which section or page should I be looking for?


Robbie. Look in the overhaul manual. https://jabiru.net.au/wp-content/upload ... Manual.pdf Pages 49,73 and 158.

Its a new manual hot off the press.

Steve
Sonex 892
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Re: Jabiru oil leak resolved

Postby Sonex1517 » Mon May 04, 2020 7:39 pm

Thanks! That is definitely fresh material!
Robbie Culver
Sonex 1517
Aero Estates (T25)
First flight 10/10/2015
375+ hours
Jabiru 3300 Gen 4
Prince P Tip
Taildragger
N1517S
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Re: Jabiru oil leak resolved

Postby Sonex1517 » Sun Jun 14, 2020 7:38 pm

In case anyone else needs to do this, I thought I’d expand on the explanation of how.

I used ENGINE OVERHAUL, ASSEMBLY AND PARTS BOOK FOR JABIRU GENERATION 4 2200 AND 3300 AIRCRAFT ENGINES
DOCUMENT No. JEM0004-6 Dated – 30/05/2020 (thanks Steve!)

Found here - https://jabiru.net.au/service/manuals/

There are multiple variations of the pump and plates now. The pump has a four lobe version and a six lobe version. My generation 4 engine has a six lobe pump but the back plate does not have the groove and gasket that the latest version apparently has.

I had purchased Loctite 515 and 7649 primer as John mentioned. (It appears Loctite 518 is a suitable replacement) I found removing the prop was the easiest method to get the pump off. Pulled the 4 cap screws and worked the cover off, then carefully removed the oil pump inner and outer gears off. John is quite accurate in his description that the woodruff key is an escape artist. I then worked the pump back plate off.

All of this took less than 30 minutes.

I thoroughly cleaned everything, dried it and removed any residual sealant. Cleaned it again, dried it again, then applied the Loctite primer all over the faces. I put oil on the gears and in the cover per the manual.

Getting the woodruff key and inner gear back on was a bit trying, but I just took my time and it worked.

I smeared a layer of Loctite 515 on and then carefully reassembled things. One important note is the need to only tighten the cap screws finger tight at first, then put the prop back on and rotate it a few turns to ensure the gears and housing are not bound up. Then it’s safe to tighten and torque the cap screws.

After a test flight today, no more seepage. I hope it stays that way.
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Robbie Culver
Sonex 1517
Aero Estates (T25)
First flight 10/10/2015
375+ hours
Jabiru 3300 Gen 4
Prince P Tip
Taildragger
N1517S
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Posts: 1670
Joined: Fri Jun 03, 2011 10:11 am
Location: T25 Aero Estates, Frankston, TX

Re: Jabiru oil leak resolved

Postby fastj22 » Sun Jun 14, 2020 7:50 pm

Excellent work Robbie.
Like old men, excitable women and Harley Davidsons, they tend to leak.

Mine is high and dry until the sealant cracks again.

John Gillis
SEL Private, Comm Glider, Tow pilot (Pawnee Driver)
Waiex N116YX, Jabiru 3300, Tail dragger,
First flight, 3/16/2013. 403 hours and climbing.
Home: CO15. KOSH x 5
Flying a B-Model Conversion (Super Bee Baby!)
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Re: Jabiru oil leak resolved

Postby Sonex1517 » Sun Jun 14, 2020 7:59 pm

Hopeful mine stays the same. Thanks John!
Robbie Culver
Sonex 1517
Aero Estates (T25)
First flight 10/10/2015
375+ hours
Jabiru 3300 Gen 4
Prince P Tip
Taildragger
N1517S
User avatar
Sonex1517
 
Posts: 1670
Joined: Fri Jun 03, 2011 10:11 am
Location: T25 Aero Estates, Frankston, TX


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