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Old 08-14-2022, 07:25 AM
david.perl's Avatar
david.perl david.perl is offline
Join Date: Dec 2010
Location: Watford UK
Posts: 154
Default what are the risks of lapping an exhaust valve in place?

My inspector has advised against exhaust valve lapping in place - to quote him he "would only do this if stuck somewhere remote or in the third world". He says as its not a lycoming approved procedure so it can't be right.

Savvy aviation have recommended this as my next step. My inspector is saying i am introducing contaminants into the cylinder and valve guide and that can't be good.

If done a ton of reading around this and cant seem to find many negatives. In medicine, when a new procedure comes along, its well researched and the findings published. I cant see to find any published research for airplane engine procedures of this nature.

the more i read, the more im confused.

What am i missing that my inspector is seeing?
SB RV 7A IO360 lycoming and Hartzell CS prop
First flight October 2015
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