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Oily Residue

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BobbyPaulk(at)comcast.net
Guest

Posted: Mon Mar 19, 2012 12:27 pm Post subject: Oily Residue

p { margin: 0; }List 

We have two Jabiru 3300 in my area and both have shown a brown oily residue at the bottom six o'clock position middle of the cylinder. It is right at the point where the head joins the cylinders.The substance looks like oil but is a little more sticky and has blackened spots in it. It is on 5 of my cylinders ( 146 hrs ) and only on the #4 and #6 of the other engine with only 28 hrs. I believe it to be burnt oil leaking between the heads and cylinders. Has anyone else experienced this and know what it is. Should we be concerned???



Bobby  ( age 73 )

Zodiac 601 XL "B"

Jabiru  3300  S/N  1141

Sensenich 64" x 51" Prop

Bing Carb 260 Main & 285 Needle Jet

Status - Flying  146 hrs. 

 [quote][b]

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matronics(at)rtist.nl
Guest

Posted: Mon Mar 19, 2012 12:47 pm Post subject: Oily Residue

That's blow by. Your head-to-cylinder surface is leaking. Perhaps     your heads are not properly torqued up or they are warped due to     overheating. 

     

     Rob

     

     On 3/19/2012 9:25 PM, BobbyPaulk(at)comcast.net (BobbyPaulk(at)comcast.net) wrote:     [quote]       p { margin: 0; }                p { margin: 0; }         List           

           We have two Jabiru 3300 in my area and both have shown a brown           oily residue at the bottom six o'clock position middle of the           cylinder. It is right at the point where the head joins the           cylinders.The substance looks like oil but is a little more           sticky and has blackened spots in it. It is on 5 of my           cylinders ( 146 hrs ) and only on the #4 and #6 of the other           engine with only 28 hrs. I believe it to be burnt oil leaking           between the heads and cylinders. Has anyone else experienced           this and know what it is. Should we be concerned???

           

           Bobby  ( age 73 )

           Zodiac 601 XL "B"

           Jabiru  3300  S/N  1141

           Sensenich 64" x 51" Prop

           Bing Carb 260 Main & 285 Needle Jet

           Status - Flying  146 hrs. 

         

       

        	  Quote: 	
		  

	
     [b]

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dons701

Joined: 22 May 2009
Posts: 80
Location: Hershey, PA

Posted: Tue Mar 20, 2012 7:18 pm Post subject: Re: Oily Residue

Rob, Not long after purchasing my plane 3 years ago with 50 hours, I had noticed the same staining on the bottom of two cylinders. I found that these heads are easy to remove for inspection and cleaning. Once removed, gently scrape to remove the crusty oil deposits from the end of the barrel and inside the receiver groove of the head. On assembly I use a very thin film of an nickel anti-seize on the end of the barrel and on the head bolts and torque to spec. I have not had any problems ever since, just watch your head temps.  Hope this helps...DonB

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_________________
Zenith 701 #76120
Jabiru 2200A #2456 95 hours
Sensenich Wood 64-PJ-36 Prop

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