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#11
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Lycoming SB for soft pin plugs
On Fri, 17 Aug 2007 23:59:42 -0000, "Robert M. Gary"
wrote: The shop is recommending pulling all cylinders and doing a top. Does one cylinder having an issue with pin plugs mean others much (the IA says so, I'm not sure). I'm thinking I just want to replace this cylinder and then fly it. The oil analysis will show if there is another plug wearing. One cylinder having pin plugs issues really doesn't mean a thing with regard to pin plugs in the other cylinders. However @1000 hrs, it's very likely that the e-valve guides in all the cylinders are at or beyond serviceable limits. Am curious what the OP or his tech found that requires cylinder replacement. The IA said the cylinder was "2 one thousands" out of spec. Actually one of the reasons we choose this cylinder to pull ( from the oil analysis we knew we had to pull one of them do to progressively higher AL counts), was that the cross hatching was gone on #1 (this is recent because we boroscoped it at annual and didn't see this). This engine has 1000 SFNEW in 1998 so I was not expecting to have to replace cylinders. The IA did say that the bottom looks like a new engine, no sign of any problems down there (we change the oil about every 30 hours). Anyway, the IA is recommending a full top and I'm not sure that is the way to go. -Robert A lot if it depends on the installation, as in how much stuff has to get yanked off to get at the "one" cylinder. Theshop labor cost for one should not be 1/2 of the labor cost to do 2, or 1/4 of the labor cost for 4. R/R'ing the cylinders is the easy part. Getting all the other stuff out of the way and back on is what takes the time... I would definitely have the two on that side of the engine sent out for " inspection and repair as needed". If the one that you have off already needs to go to an oversized piston, then it's twin on the other side should be punched out also. If you are just going to bolt on a new one, that is not an issue. Been a few years since I shopped for cylinders/repairs. A set of guides, and e-valve and a ring set/hone job used to be relatively inexpensive. If you have to purchase a piston and have the cylinder bored oversize, you might be getting to where a new replacement is more economical. TC |
#12
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Lycoming SB for soft pin plugs
I have taken the opposite tack... On a 1500 hour 0-320 that is burning
a quart every 2.7 hours I have purchased 4 factory new Lycoming cylinder kits... Come annual time (January, when the flying is bad up here) we will pull the old cylinders and inspect the cam and pull one rod bearing to check for wear... If all looks OK then we will just replace the cylinders and call it good for another 1000 hours, or so... If any of the bottom components look bad then we will overhaul the bottom... denny |
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