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#1
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Damaged/Cracked cylinder
My partner and I just purchased a Piper Warrior from California. All
the compressions on the engine are 72 or better. We test flew for about two hours and found no problems. Just recently she was taken in for the Canadian inspection. The AME in Brampton told us that the compressions were good but one cylinder was cracked. What I would like to know is how can you have good compressions with a cracked cylinder. Also how can you determine that a cylinder is cracked without dismantling the engine. The aircraft is a PA28-151, with a 0-320. If anyone can clairfy this issue I would really appreciate it. Can you fly the plane this way or is it dangerous. Thanx Jurgen.. |
#2
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Damaged/Cracked cylinder
"av8tr" wrote in message oups.com... My partner and I just purchased a Piper Warrior from California. All the compressions on the engine are 72 or better. We test flew for about two hours and found no problems. Just recently she was taken in for the Canadian inspection. The AME in Brampton told us that the compressions were good but one cylinder was cracked. What I would like to know is how can you have good compressions with a cracked cylinder. It is very simple. I did an annual inspection on my 182 before leaving for Oshkosh and on the way home a cylinder cracked to the point that the intake and exhaust manifolds were the only thing holding it onto the engine. Depending on where the crack is, it could be completely below the piston rings (as was mine) and you would never notice it on a compression check. Even with a mirror inspection (as was mine) you could not detect an incipient crack that had not yet broken through the surface of the cylinder wall. Also how can you determine that a cylinder is cracked without dismantling the engine. If the crack is all the way through the cylinder, you can certainly see an oil line that would bear further investigation. If it is NOT through the cylinder, the only way is to do an internal AND external visual AND particle/glow/xray inspection of the part in question (removal from the engine necessary). The aircraft is a PA28-151, with a 0-320. If anyone can clairfy this issue I would really appreciate it. Can you fly the plane this way or is it dangerous. YOu can't be serious, can you? Jim |
#3
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Damaged/Cracked cylinder
In article .com,
"av8tr" wrote: My partner and I just purchased a Piper Warrior from California. All the compressions on the engine are 72 or better. We test flew for about two hours and found no problems. Just recently she was taken in for the Canadian inspection. The AME in Brampton told us that the compressions were good but one cylinder was cracked. What I would like to know is how can you have good compressions with a cracked cylinder. It depends on where the crack is and how extensive it is. One year an IA was "inspecting" my airplane and found two cracked cylinders. Both cracks were very small. I had not noticed any performance issues with the airplane prior to bringing the airplane in for the annual. Also how can you determine that a cylinder is cracked without dismantling the engine. visual inspection. Open the cowling and look at the cylinders. Good luck. -- Bob Noel Looking for a sig the lawyers will hate |
#4
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Damaged/Cracked cylinder
"RST Engineering" wrote in message
... The aircraft is a PA28-151, with a 0-320. If anyone can clairfy this issue I would really appreciate it. Can you fly the plane this way or is it dangerous. YOu can't be serious, can you? Jim If this is his first experience with a cracked cylinder, I'm sure he is serious. How else would one know? |
#5
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Damaged/Cracked cylinder
Having owned a Warrior with the same low powered motor in it I am
willing to bet the crank is in the exhaust port and it is running up toward the guide boss. That crack will not cause compression issues but left unattended it will eventually cause the exhaust seat and or the guide to come loose. Not a good thing.. My guess the A&P saw it when he removed the exhaust system for some reason. Fill us all in on the location of this crack in your new bird please... av8tr wrote: My partner and I just purchased a Piper Warrior from California. All the compressions on the engine are 72 or better. We test flew for about two hours and found no problems. Just recently she was taken in for the Canadian inspection. The AME in Brampton told us that the compressions were good but one cylinder was cracked. What I would like to know is how can you have good compressions with a cracked cylinder. Also how can you determine that a cylinder is cracked without dismantling the engine. The aircraft is a PA28-151, with a 0-320. If anyone can clairfy this issue I would really appreciate it. Can you fly the plane this way or is it dangerous. Thanx Jurgen.. |
#6
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Damaged/Cracked cylinder
av8tr wrote: My partner and I just purchased a Piper Warrior from California. All the compressions on the engine are 72 or better. We test flew for about two hours and found no problems. Just recently she was taken in for the Canadian inspection. The AME in Brampton told us that the compressions were good but one cylinder was cracked. What I would like to know is how can you have good compressions with a cracked cylinder. Also how can you determine that a cylinder is cracked without dismantling the engine. The aircraft is a PA28-151, with a 0-320. If anyone can clairfy this issue I would really appreciate it. Can you fly the plane this way or is it dangerous. Thanx Jurgen.. During an import inspection the mechanic may have seen a bit of exhaust staining on the cylinder head. He would look for a crack during the compression test using a soap and water mix on the head and upper cylinder. Lycoming cylinders can crack between a sparkplug hole and the exhaust port, and it might not leak enough to show up on the compression tester but will sure make some bubbles in the soap. You can't just let it go, either. When we do the Canadian AD that applies to all exhaust systems that take cabin heat from the exhaust system (CF90-03R2), we use the soap and water on all the exhaust components and frequently find small cracks before they get serious (and expensive). Be thankful for a mechanic who keeps you safe. There are a few who will try to rip you off, but most of the rest just don't want to get blamed for overlooking or ignoring something that caused an accident. Dan |
#7
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Damaged/Cracked cylinder
wrote: When we do the Canadian AD that applies to all exhaust systems that take cabin heat from the exhaust system (CF90-03R2), we use the soap and water on all the exhaust components and frequently find small cracks before they get serious (and expensive). We do the same in the U.S. but at annual, not under an AD. -Robert |
#8
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Damaged/Cracked cylinder
as an owner, i've resigned myself to the fact that these things just
shed jugs and that's the way it is. that's one of the reasons i chose to have 6 little bitty jugs instead of 4 big ones. if one of mine gets to feelin pooly it's no big deal. i just replace it, i did not need that thousand-dollars, did i? your ship is grounded till repair. dan av8tr wrote: My partner and I just purchased a Piper Warrior from California. All the compressions on the engine are 72 or better. We test flew for about two hours and found no problems. Just recently she was taken in for the Canadian inspection. The AME in Brampton told us that the compressions were good but one cylinder was cracked. What I would like to know is how can you have good compressions with a cracked cylinder. Also how can you determine that a cylinder is cracked without dismantling the engine. The aircraft is a PA28-151, with a 0-320. If anyone can clairfy this issue I would really appreciate it. Can you fly the plane this way or is it dangerous. Thanx Jurgen.. |
#9
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Damaged/Cracked cylinder
as an owner, i've resigned myself to the fact that these things just
shed jugs and that's the way it is. that's one of the reasons i chose to have 6 little bitty jugs instead of 4 big ones. if one of mine gets to feelin pooly it's no big deal. i just replace it, i did not need that thousand-dollars, did i? Knock on wood, I've had good luck with our Millenium cylinders thus far... They're a little beefier in areas that are known to crack. -- Jay Honeck Iowa City, IA Pathfinder N56993 www.AlexisParkInn.com "Your Aviation Destination" |
#10
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Damaged/Cracked cylinder
houstondan wrote:
i just replace it, i did not need that thousand-dollars, did i? LOL! Just dropped a couple AMUs on AP-related repairs, so your comment is especially timely. -- Peter |
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