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Rotax 5 year rubber replacement

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Rex Rodebush

Joined: 10 Jan 2006
Posts: 209
Location: Branson West area, Missouri

Posted: Thu Jun 21, 2018 6:55 am Post subject: Rotax 5 year rubber replacement

Rotax requires a rubber replacement at 5 years for their 912 engines.  Coolant, oil and fuel lines, carburetor diaphragms, flanges , etc.  They also want the fuel pump replaced after 5 years.   Also, my engine mounts are about 9 years old.  (Have about 60 running hours on them over the last 5 years).  They seem OK but wondered if I should go ahead and replace them.  Any comments appreciated.

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John Hauck

Joined: 09 Jan 2006
Posts: 4639
Location: Titus, Alabama (hauck's holler)

Posted: Thu Jun 21, 2018 8:11 am Post subject: Rotax 5 year rubber replacement

I've had good luck with my three 912 series engines.  Never let me down

since 1993 and about 3200 hours.  Only time I ever had one quit on me was

landing at Toad River, BC.  Was determined the idle jets iced up from a long

slow approach down the mountain side to the gravel strip.  Weather was

perfect for carb ice.



This last 912ULS I changed out the coolant hoses around 5 or 6 years.  Used

locally procured Gates hose rather than spend all that money for Rotax

hoses.  Engine oil hoses are super high quality silicone with the blue

outside cover.  They have been on their since my first 912ULS around 2000.

They are steel braid reinforced.  No problem with degradation of the

interior of the oil hoses.



Used to change out a lot of the other rubber stuff, carb diaphragms, etc.,

but haven't bothered with this last engine I mounted in 2007.  I do keep my

eyes on the carb sockets to insure they are not cracking.  If I see a crack

or feel they need changing, I change them.  This last time I changed them

with JBM sockets.  I see they want 76.00 a piece for them now, three times

more than the two stroke sockets.   ???  Hope I don't have to replace the

ones I have, but they have lasted much longer for me than Rotax sockets.



While I am at it I may as well share my feelings for Rotax oil filters at

25.00 a pop, last time I looked.  I have used Fram (oh my God!) Tough Guard

TG-3614 oil filters since day one on all my 912's, about 5.00 a pop.  They

do a good job for me.



I wouldn't tell anyone to not follow procedures established by Rotax for 912

maintenance, I don't recommend anyone doing as I do, but that is the way I

do it with pretty good success.



john h

mkIII

Titus, Alabama





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_________________
John Hauck
MKIII/912ULS
hauck's holler
Titus, Alabama

rickofudall

Joined: 19 Sep 2009
Posts: 1392
Location: Udall, KS, USA

Posted: Sun Jul 01, 2018 11:55 am Post subject: Rotax 5 year rubber replacement

Depends on how you view maintenance, I guess. If you have an SLSA and its

maintenance manual says "service per Rotax", you're stuck with the schedule

AND what you can use in the way of parts. Anything other than Rotax or A/C

manufacturer supplied parts have to have a letter of authorization. The

same would apply I believe if you bought a 912 S instead of the ULS and you

wanted to keep it "certified".

As for what to use if it's your option I highly recommend Silicone hose for

all the coolant lines. Pegasus Racing and others have it in metric and inch

sizes. You buy it once.

Orings and such can be had at McMaster Carr but you'll have to buy in qty

50 or 100. Usually for half what Rotax charges for 1. So you pay less AND

get a lifetime supply. :-}

I went through Rotax 2 and 4 stroke schools in 2007 so I've had a chance to

test this out for the last 11 years. If you rub in a coat of good ole white

lithium grease on hoses, orings and carb sockets they last longer. How much

longer I can't say without knowing your aircraft's environment. For me,

with a hangar, I know it's at least twice as long as stored samples that

dried out.



Rick Girard



On Thu, Jun 21, 2018 at 11:09 AM, John Hauck <jhauck(at)elmore.rr.com> wrote:



[quote] 



 I've had good luck with my three 912 series engines.  Never let me down

 since 1993 and about 3200 hours.  Only time I ever had one quit on me was

 landing at Toad River, BC.  Was determined the idle jets iced up from a

 long

 slow approach down the mountain side to the gravel strip.  Weather was

 perfect for carb ice.



 This last 912ULS I changed out the coolant hoses around 5 or 6 years.  Used

 locally procured Gates hose rather than spend all that money for Rotax

 hoses.  Engine oil hoses are super high quality silicone with the blue

 outside cover.  They have been on their since my first 912ULS around 2000

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The smallest miracle right in front of you is enough to make you happy....

Rex Rodebush

Joined: 10 Jan 2006
Posts: 209
Location: Branson West area, Missouri

Posted: Sun Jul 01, 2018 2:53 pm Post subject: Re: Rotax 5 year rubber replacement

John and Rick, thanks for your comments.  Working now on getting the parts together.  Will replace stuff in November.  Need to get the BRS repacked and probably a new rocket at the same time. Do not archive.

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