Steve,
The carb flange life is dependent on care and how well your plane is tuned.
A tuned Rotax places little vibration on the carbs. A properly supported
airbox prevents any further vibration. A bit of care during carb removal
at a two year carb rebuild prevents damage also, so I too have a perfectly
good set of 5 year old carb flanges on the shelf collecting dust as spares
if I crack one of mine during maintenance. I won=92t change the flanges on
the carb until one gets cracked during a carb overhaul or service.
As for the other rubber. Heat and shielding and mechanical damage determin
es the mean time between failure. A Rotax, in-cowled, kept outside on a mi
crolight needs a 5 year change for sure, as it is exposed to UV. The lower
coolant hoses, just above the exhaust, I change at 5 years unless they are
silicone and shielded, due to heat exposure.
The 914 vent tubes can crack in 5 years, so I bite the bullet and keep spar
e hose on hand and change it out at 5 years.
The oil sump line on the bottom banjo (even though it is shielded) I check
every 25 hours, as the reflective heat on that stupidly close fitting makes
it suspect. I wish that was a solid steel line. I may make one someday.
Otherwise, if you have rubber hoses on top of the engine, I think 10 years
is a reasonable time change. If you have silicone hose, definitely 10 year
s. Proper silicone hose is very good, I even put a torch to one to see how
long it would last at 1500F. It got white and held pressure.
That is my opinion after doing a few 5 year hose changes.
Best Regards,
Bud Yerly
Sent from Mail<https://go.microsoft.com/fwlink/?LinkId=550986> for Window
s 10
________________________________
From: owner-europa-list-server@matronics.com <owner-europa-list-server@matr
onics.com> on behalf of Steven Pitt <stevenwpitt@me.com>
Sent: Tuesday, November 7, 2017 4:28:13 PM
Subject: Europa-List: Carburetor flange on 912S
I am biting the bullet and renewing various items on my Rotax 912S.
I have kept photo records of the flanges at each service, and not noticed a
ny wear as the carburettors and airbox seem well supported.
So what is the common view on changing the flanges as time expired products
?
Rotax bulleting SB-912-030R1 seems to suggest only certain engines need cha
nging but what is the perceived wisdom from the Rotax owners out there?
Also where does one acquire these at the eyewaterinw price that I have seen
on the internet?
Thanks
Steve Pitt
912S on a trigear
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