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> Could someone enlighten me as to what is typically done during a 'top' > overhaul? Cylinders or cylinder components are repaired or replaced as necessary. A thorough job should include new pistons and rings and a new exhaust valve guide at a minimum. Valves and seats are ground. The exhaust valve may require replacement, depending on condition, and the intake valve may also if it's been ground before. The cylinder may need to be ground oversize, especially in light of the time sitting. The cylinder may be no good or a bad risk if this is not it's first or second run to TBO. Spending money to overhaul cylinders of unknown pedigree is a waste, in my opinion. For the same reason, exchange cylinders are a form of Russian roulette and you have no way of knowing how many bullets are in the gun. All cylinders eventually crack, if not discarded for other reasons. Cracked cylinders are not worth reapiring, IMHO. > Does anyone know a ball-parkish figure on how much it costs to have > this work done? > Well, a new cylinder assembly goes about $750.00, so that's sort of the top of the top. Figure 3-4 hours labor to take one off and on, and there's economy in numbers, so the whole set would be less than 4 times a single one. Now, having said that, if your engine hasn't been apart since Carter was president, you might want to consider opening the case and looking around inside, especially if you don't know much more about its history other than there was a long period of inactivity.... YMMV John ========================================================================== ==== To leave this forum go to: http://ercoupers.com/lists.htm Search the archives on http://escribe.com/aviation/coupers/
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