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JohnF
Joined: 13 May 2010
Posts: 124
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 Posted: Mon Mar 16, 2015 9:38 am Post subject: 5-Year Rotax Rubber Replacement |
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On my RV-12, with Rotax 912ULS I am thinking of replacing all hoses with the Aircraft Specialty (AS) PTFE hoses.
The 5-year replacement "kit" from Cal. Power Systems, seems to have some hoses that duplicate (more or less) those that I will be using from Aircraft Specialty.
I need to know what rubber parts to purchase beyond those from AS, particularly the carb parts.
Can anyone point me in the right direction? Hopefully Roger Lee can help with this....Thanks
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Roger Lee
Joined: 10 Jan 2006
Posts: 1464
Location: Tucson, Az.
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| Posted: Mon Mar 16, 2015 3:45 pm Post subject: Re: 5-Year Rotax Rubber Replacement |
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Just some food for thought. This is certainly a personal preference item.
I have done 7-8 RV12 hose changes.
Those Teflon hoses are expensive, but yes they are the best. If just the fuel aren't they $500+? They are supposed to be a 10 year hose?
If you add oil hoses that has to be up around $1000.
The standard rubber fuel hose would be about $15-$20. If you double that for the 10 year mark that has a pretty big price difference. The standard 13mm (1/2") oil hoses would normally cost around $35-$45 verses over $500+ for Teflon. If you are switching to the Teflon hose and since these are pre-made you will need new fittings for these new hose to fit them to the engine. They may come with them I do not know, you would hope so. They may or may not come with fire sleeve I don't know. There is a good chance they come ready to go with fittings and fire sleeve.
That said you would have labor included for the second hose change and that may be around $500-$800.
Depending on the shop that changes the hoses a normal full hose change parts and labor may cost any where from $2500-$4000. The high end number would be a little more expensive shops.
If you use the Teflon fuel hoses you will still need:
13mm oil hose (from Spruce)
17mm coolant hose from Spruce
25mm (1") coolant hose
90 degree 17mm coolant hose
carb diaphragms
Carb sockets
66mm carb balance tube hose
Oetiker band clamps or fuel injection clamps for standard fuel hose
Fuel injection clamps for the oil line.
Band-It band clamps for the fire sleeve. Fire sleeve may be re-usable if the hose lengths are the same.
The thing with Spruce's kit is they assume you will take certain things apart and will need things like crush washers. The thing is you don't need to disturb the fitting just pull the hose off and replace it. I usually need need as many parts as they want to sell so when I need things I just buy specific parts and that can save quite a bit which I can then pass on to the customer.
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Roger Lee
Tucson, Az.
Rotax Instructor & Rotax IRC
Light Sport Repairman
Home 520-574-1080 TRY HOME FIRST
Cell 520-349-7056 |
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rampil
Joined: 04 May 2007
Posts: 870
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| Posted: Thu Mar 19, 2015 5:23 am Post subject: Re: 5-Year Rotax Rubber Replacement |
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Hi Roger,
Aeroquip 666 is supposed to be a service life unlimited product. Why
assume a ten year replacement, instead of on-condition?
Of course on the rotax we need to use real aerospace 666, not the cheaper
automotive hose lacking the interior conductive carbon strip.
Having said that, I will share a brief cautionary tale.
I removed the crappy VDO oil pressure transducer, replacing it with
a modern, aerospace rated (read expensive) transducer I mounted on the
firewall. I chose Aeroquip666 with appropriate fittings from the block to
the transducer. The hose and the fittings were about $100.
The hose worked great for years until.....I was charging my main battery
and the ground momentarily made contact with the stainless braid of this
hose. Unknown to me at the time, the 20 Amp charge current perforated
the teflon liner. No obvious sign on the ground... About a mile off the
runway, my cockpit filled with smoke from oil spray onto my muffler.
Under engine running oil pressure, that pinhole sprayed quite a bit of oil.
| | - The Matronics RotaxEngines-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?RotaxEngines-List |
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Ira N224XS |
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KeysFox
Joined: 05 Jan 2009
Posts: 137
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| Posted: Fri Mar 20, 2015 3:12 pm Post subject: 5-Year Rotax Rubber Replacement |
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fascinating post
Your event makes me think about going beyond basics that have demonstrated
proven reliability over time
BJ Kitfox IV 912
| Quote: |
Hi Roger,
Aeroquip 666 is supposed to be a service life unlimited product. Why
assume a ten year replacement, instead of on-condition?
Of course on the rotax we need to use real aerospace 666, not the cheaper
automotive hose lacking the interior conductive carbon strip.
Having said that, I will share a brief cautionary tale.
I removed the crappy VDO oil pressure transducer, replacing it with
a modern, aerospace rated (read expensive) transducer I mounted on the
firewall. I chose Aeroquip666 with appropriate fittings from the block to
the transducer. The hose and the fittings were about $100.
The hose worked great for years until.....I was charging my main battery
and the ground momentarily made contact with the stainless braid of this
hose. Unknown to me at the time, the 20 Amp charge current perforated
the teflon liner. No obvious sign on the ground... About a mile off the
runway, my cockpit filled with smoke from oil spray onto my muffler.
Under engine running oil pressure, that pinhole sprayed quite a bit of
oil.
--------
Ira N224XS
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=439591#439591
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B Jones
N154K
443-480-1023 |
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