---------------------------------------------------------- Europa-List Digest Archive --- Total Messages Posted Fri 01/17/25: 2 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 03:07 AM - Re: Re: What did you do with your Europa this week 10/01/25 (D McFadyean) 2. 02:18 PM - Re: What did you do with your Europa this week 10/01/25 (Area-51) ________________________________ Message 1 _____________________________________ Time: 03:07:12 AM PST US From: D McFadyean Subject: Re: Europa-List: Re: What did you do with your Europa this week 10/01/25 By comparison, the exhaust valve head seats of my 700hr 20year old ULS look like they were cut yesterday. It's had an easy life (generally run at 50% or less) but not hangared in ideally dry conditions. Duncan McF > On 17/01/2025 07:58 GMT Area-51 wrote: > > > > Thanks Bud, that pretty much sums aviation up in a nutshell. In a previous life I once asked an old guy "which motorbike brand is the most reliable one", his response was gold, "they are all only as reliable as the person working on them"... A few days ago I was reading a question posted on a rotax forum, "who has any experience with a rotax engine failure during flight"; I was shocked and dismayed by the multitude of responses. But the plentiful failure situations is not what shocked me. What shocked me was these story tellers admitting that the engine failures were all direct a result of their own failure to maintain the engine or land the aircraft when they "heard something weird going on"... Bore scopes work great, on this occasion the bore scope was not leaving me convinced with enough information... > > Duncan's question... the 914 was a complete engine situation stored on a shelf for 20years. The pitting on the exhaust valves was not a result of atmospheric exposure and inconsistent with the rest of the unit's condition.. The 912ULS had been removed from a very well maintained and cared for Tecnam, wrapped in plastic and stored correctly in the factory crate with factory sealing plugs. The wetness of oil residue within the combustion chambers was not a conducive environment for rust to form and cause the degree of pitting found in the time provided. To be honest I am not going to try and work out the why or how. I will simply be removing heads at 1000hrs for vapour blasting and servicing as part of my Line Maintenance schedule. > > It's important to keep in mind these rotax units are designed to reach their TBO at 80% power all the way while following the provided factory Line Maintenance schedule. There is no shortcomings in the factory's strategy. The engine will reach its TBO, its job is complete as advertised and the unit is then required to be either "retired", or, "returned to an authorised rotax service center for overhaul". Running the engine further "on condition" has nothing to do with the factory and is all now upon the owner operator. Zero timing a TBO'd unit requires replacement of the crankshaft assembly, along with everything else the service centre is required to do... > > Federal Mogal Valve Assessment pdf attached. An old one but a good one... > > > > > Read this topic online here: > > http://forums.matronics.com/viewtopic.php?p=515230#515230 > > > > > Attachments: > > http://forums.matronics.com//files/federal_mogul_valve_information_card_111.pdf > > > ________________________________ Message 2 _____________________________________ Time: 02:18:59 PM PST US Subject: Europa-List: Re: What did you do with your Europa this week 10/01/25 From: "Area-51" Duncan its important to consider the exhaust valve heads are made of inconel and they could probably be left on a seaside boatshed bench for 20 years and still look brand new after wiping off the dust. Any pitting on the valve head itself will not be from normal atmospheric exposure. So deterioration of the inconel will be due to the introduction of some other heat/chemical/electrical/plasma induced corrosive element. The 914 was being used in a humid coastal environment; the ULS a rural outback dry environment. Read this topic online here: http://forums.matronics.com/viewtopic.php?p=515232#515232 ------------------------------------------------------------------------------------- Other Matronics Email List Services ------------------------------------------------------------------------------------- Post A New Message europa-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/Europa-List.htm Web Forum Interface To Lists http://forums.matronics.com Matronics List Wiki http://wiki.matronics.com Full Archive Search Engine http://www.matronics.com/search 7-Day List Browse http://www.matronics.com/browse/europa-list Browse Digests http://www.matronics.com/digest/europa-list Browse Other Lists http://www.matronics.com/browse Live Online Chat! http://www.matronics.com/chat Archive Downloading http://www.matronics.com/archives Photo Share http://www.matronics.com/photoshare Other Email Lists http://www.matronics.com/emaillists Contributions http://www.matronics.com/contribution ------------------------------------------------------------------------------------- These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.