That is known as "Staking" the valve. Pretty common practice to fix a leaky valve if it has a deposit built up on the face. As Bob said, sometimes you have to soak them up in MMO to loosen the deposits.
Jeff Scott On Sat, 26 Nov 2005 17:58:37 -0600 "Robert L. Stone" <rsto...@hot.rr.com> writes: > Netters, > I had a pre-buy inspection done on my Cessna 152 and during > the > compression check the mechanic found one cylinder was showing only > 47 > pounds. Another mechanic did something I have never heard of > before. He > said that sometimes there will be a carbon buildup on the seal of > the > exahust valve and cause it to not close all the way and seal on the > > compression stroke as it is supposed to do. He took a large rubber > mallet > and smacked the roker arms a few times after removing the cover of > course > and now that cylinder is showing 74 pounds. Just a few strokes with > a > rubber mallet was all it took to jar the carbon off of the seal. I > could > see an expensive repair bill for grinding valves, replacing rings or > > possibly the entire cylinder so I thought you guys aught to know > about this > fix. > > Bob Stone, Harker Heights, Tx > rsto...@hot.rr.com
