Today's Message Index:
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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
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| Subject: | 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 <goldsteinindustrial@gmail.com> 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
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| Subject: | Re: What did you do with your Europa this week 10/01/25 |
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
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