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3300A Induction System

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mhcrowder

Joined: 10 Jan 2006
Posts: 42
Location: Cary, NC

Posted: Mon Jun 22, 2009 6:21 pm Post subject: 3300A Induction System

Well, after 28 hours I'm still battling high EGT's on Cylinders 3 & 5. during WOT.  I've tried rotating the carburetor to try and compensate for the higher EGT temps on #3 and #5.  On take-off I'm seeing 1450F+.  As soon as I pull power back the temps drop to manageable levels although #3 & #5 are always the highest.



I've decided the next time I'm out at the airport I want to check/inspect the induction path on cylinders #3 & #5 for leaks.  The Operator's manual and parts manual don't describe the process of removing the induction tubes from the induction plenum.  So I have somewhere to start, has anyone removed the lower induction tubes and are there any "gotchas" I need to worry about?  The parts manual mentions an O-Ring at this interface?  I don't want to damage anything.  Anyone have any pictures they'd care to share?



Thanks,

Michael

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Lynn Matteson

Joined: 10 Jan 2006
Posts: 2778
Location: Grass Lake, Michigan

Posted: Tue Jun 23, 2009 4:24 am Post subject: 3300A Induction System

Yes, there are o-rings where the tubes plug into the plenum, and my  

engine, when new, had a bit of sealant around the tubes at that point  

also. When I rebuilt my engine, I smeared a bit of RTV around the  

tubes where they enter the plenum, just to be sure of no leaks.



Lynn Matteson

Kitfox IV Speedster, taildragger

Jabiru 2200, #2062, 681.2 hrs

Sensenich 62x46 Wood prop

Electroair direct-fire ignition system

Status: flying





On Jun 22, 2009, at 10:21 PM, sonex293 wrote:



 	  Quote: 	
		   

 <sonex293(at)gmail.com>



 Well, after 28 hours I'm still battling high EGT's on Cylinders 3 &  

 5. during WOT.  I've tried rotating the carburetor to try and  

 compensate for the higher EGT temps on #3 and #5.  On take-off I'm  

 seeing 1450F+.  As soon as I pull power back the temps drop to  

 manageable levels although #3 & #5 are always the highest.



 I've decided the next time I'm out at the airport I want to check/ 

 inspect the induction path on cylinders #3 & #5 for leaks.  The  

 Operator's manual and parts manual don't describe the process of  

 removing the induction tubes from the induction plenum.  So I have  

 somewhere to start, has anyone removed the lower induction tubes  

 and are there any "gotchas" I need to worry about?  The parts  

 manual mentions an O-Ring at this interface?  I don't want to  

 damage anything.  Anyone have any pictures they'd care to share?



 Thanks,

 Michael





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_________________
Lynn
Kitfox IV-Jabiru 2200
N369LM

wypaul

Joined: 08 Jun 2007
Posts: 24

Posted: Tue Jun 23, 2009 5:50 am Post subject: Re: 3300A Induction System

Michael,



If you have the old style of exhaust with the gaskets at the head these will be likely suspects.  An easy way to check for manifold leaks is to spray carb cleaner at all connects and joints while the engine is running.  If you have a leak there will be a drop in RPM and the engine will run rough.  I had the old style exhaust and mine would blow gaskets within a couple of hours of being replaced.  I finally had the heads machined to take the new exhaust.



Paul Spackman

Q2 Jabiru 3300 #278

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_________________
Paul Spackman
Q-2 Jabiru 3300

Clive J

Joined: 03 Nov 2007
Posts: 340
Location: UK

Posted: Fri Jun 26, 2009 10:43 am Post subject: 3300A Induction System

I had new gaskets blow in a 3300 after only a few hours, the holes

weren't machined deep enough so the set screws were bottoming out.

Thicker washers under the screws and it was OK.

Regards, Clive



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