[TShort]

I'd like input from those with experience.

Lycoming IO-540 D4A5 in my RV-10. 315 tach hours since new.
Compressions fine all >70/80 cold. Runs fine no issues. I run LOP when on XC flights but otherwise ROP. CHTs generally well less than 400, though they will approach 400 on takeoff on a hot day.

I'm interested to see what people think of the borescope pics from annual this year (taken today). They are presented in order, cyl 1 to 6:


The only one that looks odd to me is #1, but I am not sure what to make of it.

Thanks in advance for any input.

 

[BillL]

The look pretty consistent, Tom. That #1 appears to have some oil on the seat that wicked into the surface deposits.

 

[TShort]

Thanks, Bill.

I thought 1 looked different but it didn't look like any of the "bad" valves I've seen. Oil seepage would explain that irregular appearance.

The plugs are still out, I may try and shoot a couple better pics.

Thomas

 

[ShortSnorter]

What type of borescope did you use to capture the images?