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  #1  
Old 12-12-2011, 08:00 PM
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Question Another intake question

50 more hours on new O-320 time to change the oil. Total 150 since new. Engine was run hard during these last 50 hours and consumed close to two quarts but oil temperature rare went to 170F mostly 150-160 I have larger cooler and plenum.

Discovered interesting phenomenon three out of four intakes had these strange oily tracks. It's not exactly pure oil but a strange tar like substance. It's easy to clean with 100LL. What is it?














All 8 intake bolts need to be tightened. There are two washers on each flat and crush. What proper torque values are for those?

I burned some gallonage of unleaded fuel 90+ octane mixed with 100LL if it helps. Running lean most of the time.


In this thread http://www.vansairforce.com/communit...ht=intake+leak there is a suggestion of push rod tubes leak but I doubt I have 3 cylinders pushrod tubes leaking. Any explanation and advice appreciated.
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Last edited by Vlad : 12-12-2011 at 08:03 PM.
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  #2  
Old 12-13-2011, 11:07 AM
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Hello Vlad,

If it’s not the push tubes, maybe some assembly/preservative oil finally warmed up enough to run down out of there ? with the help of a little gas if the nuts are a bit loose ?

Just guessing, haven’t heated up my new Lycoming yet, be interesting to see what you find. Like post #4 in the thread you list says, there should not be oil in the intake tube.

pk
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  #3  
Old 12-13-2011, 11:28 AM
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Have you checked the oil return lines from rockers? Clamps of mine were not tightened enough. For a while I thought I had cylinder base leak. I even replaced a o-ring for nothing.
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  #4  
Old 12-13-2011, 12:01 PM
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Check with your engine builder, but I suspect this to be some kind of gasket prep used on the intake gasket. I know Aerosport does not prep the gasket, they just put them in dry as many builders do, but some do use gasket sealer. It would likely melt down and leave a sticky substance after trail as you are witnessing.
Just a guess.
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  #5  
Old 12-13-2011, 04:10 PM
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Changed oil, tightened intake bolts. Ground run with cowling off OAT 40F. Got oil temp to 120F and did couple of high speed taxi runs. Tiny streaks of dark liquid appeared again Gaskets look dry and hard. Engine is still on warranty will call Lycoming tomorrow and post the results.
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  #6  
Old 12-13-2011, 04:12 PM
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Quote:
Originally Posted by tc1234c View Post
Have you checked the oil return lines from rockers? Clamps of mine were not tightened enough. For a while I thought I had cylinder base leak. I even replaced a o-ring for nothing.
I didn't check them Ted. Will do on Friday.
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  #7  
Old 12-13-2011, 04:39 PM
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I'm in the boat with Ted, check those rocker returns.
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  #8  
Old 12-13-2011, 06:01 PM
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Looks like there is some of the same stuff running down around the base of the bottom spark plug in the last picture.
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  #9  
Old 12-13-2011, 06:07 PM
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Quote:
Originally Posted by Zero4Zulu View Post
Looks like there is some of the same stuff running down around the base of the bottom spark plug in the last picture.

Steve, brown around the base of the plug is different. It was there from the very beginning it's baked preservative oil I believe. Completely dry and very dark brown color.
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  #10  
Old 03-06-2012, 04:57 PM
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Default No intake leaks anymore

I replaced intake gaskets about 40 hours ago and there are no leak streaks on intake tubes anymore

I ordered new gaskets from Sky Ranch they are very cheap. I also read somewhere on the Web somebody used a sealant. I bought some too and first installed gasket with light application of the sealant. Several people cautioned me on that and their arguments were valid. I scraped off the nasty goo and put gaskets dry. It's very easy job to replace intake gaskets.









Old gaskets were dry and crumbling.







La Comedia Finita






Thank you all for good advice!
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