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Piston Rings 2200A Gen 1

 
Jabiru Engines
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Jabiruyank
 Jabiruyank
(@jabiruyank)
Estimable Member
Joined: 4 years ago
Posts: 64
Topic starter 21/03/2024 1:22 am  

Greetings Jab Support,

This is a follow up to my previous post. I have a Gen 1 2200A with 200 TT. Due to a failed leak down of #2 from leaking exhaust and intake valves, and after removing the cylinder heads from #2 & #4, I noticed that the cylinder bores are glazed. I will measure bore diameters first before honing with a 240 grit bottle honing tool to break the glaze -and taking bore measurement after honing as well. I'll carry out the rest of the checks as per the rebuild manual to determine serviceability of the piston and cylinder before assembly.
  1. Should I order new rings given that it has been apart?
  2. I've read that a ridge is formed from the rings on the cylinder at TDC on most engines and that it needs to be reamed so as not to damage new rings. Is that so with the 2200? I don't see mention of that in the overhaul manual.
Thanks and as always, I do appreciate all the assistance you've given through the years!
 
Alex R.
 
PS: The aircraft is registered as Experimental category in the US.

 


   
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 Jabiru Support
(@jabiru-support)
Member Admin
Joined: 4 years ago
Posts: 192
21/03/2024 12:59 pm  

Hello Alex,

When we hone we always put new rings. This also means back onto run in oil (like Aeroshell 100) for the next 25 hours. Then back to the regular running oil afterwards.

Regarding the ridge – I don’t think I’ve seen anything to suggest that the ridge would damage the rings. Hone and clean up as well as can be and also within tolerances without sacrificing too much material where the ridge is concerned.


   
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Jabiruyank
 Jabiruyank
(@jabiruyank)
Estimable Member
Joined: 4 years ago
Posts: 64
Topic starter 08/04/2024 11:02 pm  

Greetings Jabsupport. Rodger that, 25 hours with straight mineral oil. Is there a specific procedure I should follow on first start? Jabiru recommends a ground run but not sure if a honing & rings only would require that. Thanks!

Sincerely,

Alex R.


   
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 Jabiru Support
(@jabiru-support)
Member Admin
Joined: 4 years ago
Posts: 192
18/04/2024 7:39 am  

@jabiruyank No specific procedure.  Ground run to confirm everything is fine and then fly.


   
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