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Showing results for tags 'valve lapping'.
Found 2 results
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I've posted an article on how to lap a valve in situ before. This past weekend Mike had to do it and created this very good instructional video for the team on how to do it. He also had it posted on Facebook, so I thought I'd post it here too. Hopefully, many will find it helpful. Mike shows how to clean the valve face at the end, but be sure to clean the valve and seat as best you can to prevent imprinting some of the compound into the seat. One would think all the compound would immediately blow out the exhaust but wouldn't want to take the chance. Also don't recommend rinsing the compound out/off (by spraying solvent or LPS) because all that grit runs into the cylinder and can find it's way to the piston rings. Can't say how likely either of these issues are but wouldn't want to risk it. This is done without dropping the exhaust since on older/higher time pistons its not that uncommon that a stud comes out when pulling the exhaust nuts and all of sudden in your in for a much larger job. But with the exhaust off, its makes it much easier to apply the lapping compound and clean the valve face since you don't have to go through the spark plug hole.
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Did a very quick/brief search to see if this was recently discussed...but read the Jan issue of AOPA Pilot about borescopes, low compressions, and valve lapping. https://www.aopa.org/news-and-media/all-news/2022/january/pilot/savvy-maintenance-cylinder-rescue https://resources.savvyaviation.com/wp-content/uploads/savvy_pdf/exhaust-valve-lapping-paul-new.pdf Great info that prompted me to venture further down the rabbit hole of learning. After a lot of reading I came across this video that I thought was just really informative for the non-mechanic pilot! I found it interesting about the rotocoils/rotator caps and this definitely gave me another thing to keep an eye on at annual and with maintenance moving forward. I found it well worth the time to watch.
