In reference to the pushrod tube leaks, if the leak is at the head there is a special tool that re-swedges the linside of the tube and eliminates the leaks. Works great but you have to be careful not to overdo it and crack the boss.
Bill
From: [EMAIL PROTECTED]
Reply-To: [EMAIL PROTECTED]
To: [email protected]
Subject: [COUPERS-TECH] Nose High oil leak
Date: Fri, 24 Feb 2006 11:37:31 -0600
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>My 415-C with C-75-12 has always leaked oil, mainly through the starter push
>tube, but also from the pushrod tubes.
>(Since I started using AV blend, the reduction in oil level reservoir after
>each flight dropped dramatically to the point that before using AV blend I was
>adding oil after every flight and after using AV Blend I needed to add oil
>only after every third flight or so...)
>
>Yesterday, after flying 2.5 hours, the oil leak was visibly more than usual,
>and the dipstick level had dropped more than a quart, from 3.5 to less than
>2.5 quarts!!!! The only difference with yesterday's flight is that I flew for
>the longest time ever practicing SLOW FLIGHT, with the nose of the aircraft
>pointing high. I have found that nose high attitudes really increase the
>starter oil leaks. I am hoping it is just that.
>
>My AP and myself agreed to take the cowling off and do a visual inspection
>before my next flight (we did not have time yesterday). If we dont' find
>anything obviously wrong, I will keep a close eye on oil levels, while
>avoiding extended nose high flight to see if the oil loss behaves as before.
>This will either confirm or discard the "nose high" explanation for the
>increased oil loss of yesterday.
>
>Last anual was done by the previous owner, and he had the pull starter gasket
>replaced, in an obviously unsuccessful attempt to reduce this leak.
>
>Does anybody have a suggestion for me to try to reduce this source of leak????
>
>Eliacim Cortes
>N87071
>
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