@bkspero
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As I read Lycoming SB388C it seems to say that the minimum passing wobble measurement is 0.010 inches (10 thousandths). The max passing is 0.035 inches (35 thousandths). But all 4 of the measurements done on that engine last year were under 10 thousandths and there was no red flag. So I must be reading the SB wrong. What are acceptable readings in the valve wobble test? Mine were measured last year at about 700 hrs SMOH and they were in the ballpark of 15-30 thousandths…but I’m not confident that our shop is really familiar enough with the test to give reliable results.
Is 30 thousandths in 700 hrs cause for concern?
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Roscoe, how close do you think that valve was to failure? And if it still was showing good compression, was there any other symptoms? For example, what was the wobble for that valve when it got the wobble test 4 years ago and how did it compare to the others? What was the compression on that cylinder last year? Finally, did you look at that valve with a borescope while the cylinder was still installed and what did you conclude from that? Barry Speronello
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Thanks, Roscoe. So I should expect that the shop should remove the wing strips, antennas and fairings as well as wings and wing roots?
What about removing the nose gear? They would have to do that to remove the nose gear wheel pant anyway, right? And if they are doing that, the cowl is not much more work.
Barry
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Jim/Roscoe, I’m getting close to pulling the trigger on a paint job for my 76 Tiger and have some questions so when I speak with the shop I can speak from a position of knowledge. They have painted several Grummans, but that doesn’t necessarily mean they used the best practices.
First, you mention pulling the wings and wing walks, but the photos show the plane being painted with them attached. How important is it to pull the wings and wing walks?
Second, I see from the photos that you paint the plane with the dorsal fin, horizontal stabilizer fillets, sump covers, and antennas still attached. My antenna bases were painted on the last repaint and they could use some sanding and repainting. Plus it would seem to be easier to work on the plastic parts off of the plane. What are the advantages/disadvantages of stripping/painting off or on the plane?
Third, the text doesn’t specifically address the strips on the wings that cover the bond lines between the wing sections. I would guess that they need to be removed, stripped separately, primed, painted, and then re-attached. Is that correct?
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