Let'sgoflying!
Touchdown! Greaser!
So more and more people are running engines past TBO it seems; I wanted to poll the experiences of the group to find out what the most likely symptom was, of a failing engine.
Especially with regards to bottom end failure - not cylinders, as they are to me not really a sign of engine end-of-life.
We've all heard of lot of predictions and suppositions about what a person might expect, "making metal", "high oil consumption", "not making power", "internal component failure", etc etc (add yours supposition here if you must)
But if we were to accumulate data it would be actual experiences, not predictions.
Have you had an engine (or been closely involved with an engine) which ran past TBO and then failed, or was removed from service because of end-of-life symptoms? What was/were the symptom(s)?
Not saying we don't want to hear your hypotheticals and other thoughts on the topic, but I was truly looking for first- or maybe second-hand experiences with the above paragraph.
I'd like to list these actual, real-life observed symptoms for failing old engines in a list:
ie (this is merely an example of what I think a final list would look like)
1-45% most likely is spun or seized a main bearing, eng would not start or run properly
2-20% second most likely is could not maintain oil pressure
3-10% third by likelihood was case crack noted
4th-5% metal in filter
5th 5% loss of prop control due to metal in gov screen
6th 5%cam lobe failure, cylinder would not fire
7th 2% no symptoms but multiple accessory/cylinder failures forced the issue
Maybe we don't have access to enough data, but I thought I'd try.
Sort of like the medics do with older people! We like to know how we are going to 'go'!
Especially with regards to bottom end failure - not cylinders, as they are to me not really a sign of engine end-of-life.
We've all heard of lot of predictions and suppositions about what a person might expect, "making metal", "high oil consumption", "not making power", "internal component failure", etc etc (add yours supposition here if you must)
But if we were to accumulate data it would be actual experiences, not predictions.
Have you had an engine (or been closely involved with an engine) which ran past TBO and then failed, or was removed from service because of end-of-life symptoms? What was/were the symptom(s)?
Not saying we don't want to hear your hypotheticals and other thoughts on the topic, but I was truly looking for first- or maybe second-hand experiences with the above paragraph.
I'd like to list these actual, real-life observed symptoms for failing old engines in a list:
ie (this is merely an example of what I think a final list would look like)
1-45% most likely is spun or seized a main bearing, eng would not start or run properly
2-20% second most likely is could not maintain oil pressure
3-10% third by likelihood was case crack noted
4th-5% metal in filter
5th 5% loss of prop control due to metal in gov screen
6th 5%cam lobe failure, cylinder would not fire
7th 2% no symptoms but multiple accessory/cylinder failures forced the issue
Maybe we don't have access to enough data, but I thought I'd try.
Sort of like the medics do with older people! We like to know how we are going to 'go'!