339A
Well Known Member
This post is an update to the earlier one I called Tool Deathmatch in which I discovered the "cheap" Chinese dental camera.
Well with 339A down for some maintenance (the nose wheel is getting the Anti Splat Bearing Mod, should have it back before LOE. Thanks Allan.) and with some spare time on my hands, I finally managed to perform a Valveoscopy on the H2AD. This engine has a total time of 1810 hours on it, of which 1125 belong to 339A. A compression check before starting the Valveoscopy showed the following: #1 78/80, #2 78/80, #3 78/80, & #4 75/80. #3 exhaust valve, which had been my problem child, still remains good!
With my Chinese Valvescope in hand, I began the surgical procedure and managed to snap the following pictures. What I'm interested in is educated comments/opinions on the internal condition of my engine. I know there are several knowledgeable Engine Gurus on here (you know who you are), and maybe we might all learn something. My internal engine experience is zero, but I didn't notice any cracks or serious discoloration in the valves that concerned me. Although #4 exhaust face looks like it has the measles, and there seems to be a lot of lead buildup on everything? Hopefully this might motivate others with high engine times to take a look and dig a little deeper.
I have created a Picasa Web album instead of trying to post all the pics on here. Here are a few of what I consider to be the more interesting ones.
#1 Exhaust Valve Face
#1 Exhaust Seat
#1 Top Plug Hole
#3 Exhaust Seat
#3 Intake Stem
#4 Exhaust Face looks like it has the Measles.
Thanks for looking, and hopefully some good will come out of this thread.
Regards,
Well with 339A down for some maintenance (the nose wheel is getting the Anti Splat Bearing Mod, should have it back before LOE. Thanks Allan.) and with some spare time on my hands, I finally managed to perform a Valveoscopy on the H2AD. This engine has a total time of 1810 hours on it, of which 1125 belong to 339A. A compression check before starting the Valveoscopy showed the following: #1 78/80, #2 78/80, #3 78/80, & #4 75/80. #3 exhaust valve, which had been my problem child, still remains good!
With my Chinese Valvescope in hand, I began the surgical procedure and managed to snap the following pictures. What I'm interested in is educated comments/opinions on the internal condition of my engine. I know there are several knowledgeable Engine Gurus on here (you know who you are), and maybe we might all learn something. My internal engine experience is zero, but I didn't notice any cracks or serious discoloration in the valves that concerned me. Although #4 exhaust face looks like it has the measles, and there seems to be a lot of lead buildup on everything? Hopefully this might motivate others with high engine times to take a look and dig a little deeper.
I have created a Picasa Web album instead of trying to post all the pics on here. Here are a few of what I consider to be the more interesting ones.
#1 Exhaust Valve Face
#1 Exhaust Seat
#1 Top Plug Hole
#3 Exhaust Seat
#3 Intake Stem
#4 Exhaust Face looks like it has the Measles.
Thanks for looking, and hopefully some good will come out of this thread.
Regards,
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