hoses 5 yr changeout

[Dave12]

IMO the coolant hoses are the most vulnerable of the Rotax hoses. They are fairly close to the exhaust pipes and are not sleeved. I think it would be prudent to use the best quality and best fitting hoses we can find and I also think 5 years is an appropriate life cycle. Regarding oil hoses, I am comfortable stretching the change intervals. I am not advocating 15 or 20 years, but I am comfortable with 10. If fuel hoses are Teflon, I am comfortable with 10 also.

[Sink]

Many tell me in class that they put heat shielding on the coolant hoses that are close to the hot exhaust. You can either take some fire sleeve (3"-5") and split it up the middle or buy some regular fire insulation and wrap either around the affected area. This will help considerably. Over the years I have seen too many oil and coolant hose burnt through inflight because the hoses were touching hot exhaust pipes. Burn a coolant hose through and you can still have reduced power for up to 30 minutes. Burn an oil hose through and you most likely bought a new engine.

p.s.
I have also seen several oil hoses in fire sleeve that had touched the hot exhaust and there was a small amount of damage to the outside of the fire sleeve and the inner oil hose got burned through. You really can't inspect fuel or oil hose in fire sleeve unless they are removed.

[RFSchaller]

I wouldn't obsess over a few hundredths of an inch considering the hose is elastic and has a clamp

[jnmeade]

Originally Posted by Sink

Many tell me in class that they put heat shielding on the coolant hoses that are close to the hot exhaust. You can either take some fire sleeve (3"-5") and split it up the middle or buy some regular fire insulation and wrap either around the affected area. This will help considerably. Over the years I have seen too many oil and coolant hose burnt through inflight because the hoses were touching hot exhaust pipes. Burn a coolant hose through and you can still have reduced power for up to 30 minutes. Burn an oil hose through and you most likely bought a new engine.

p.s.
I have also seen several oil hoses in fire sleeve that had touched the hot exhaust and there was a small amount of damage to the outside of the fire sleeve and the inner oil hose got burned through. You really can't inspect fuel or oil hose in fire sleeve unless they are removed.

Roger, give us a number for how many is "too many" hoses that got burned through. Did these get reported to the FAA?

When you say "I have seen", do you mean you saw them personally? Was this in engines that you worked on, examples held up in class, pictures in a book? I'm trying to get an understanding of the number of these instances. These would seem to me to be so serious that we'd all have seen a lot of information about them if this problem was endemic.

Or is this an expression of "one is too many" and the actual number to your own personal knowledge may be one or two?

If any of these resulted in an accident report, maybe you could pass on the information and wew could research further.

[todehnal]

I don't know how many Roger has seen, but I check my hoses regularly. My buddy, who was building at the same time as me had a problem. When he did his 25 hour oil change, he found the oil cooler hose, VA-214 that makes a tight turn at the right front of the engine was almost burned through. He replaced the line, and I think that he even shortened the little standoff strap. I saw the hose, and it was a bit scary.............tom

[funflying]

I too was concerned about how close that particular hose was to the exhaust pipe and wrapped some heat shield material around the fire sleeve where it was close to the pipe. I used stainless tie wraps to secure the heat shield material.

I ordered this silver colored asbestos material from one of the aftermarket providers of stuff for RV's and so far so good. It seems to protect this section of oil line and it has always been on so I don't know any other condition since it was never exposed.

[dick seiders]

Patrick, do you mean asbestos looking material or is it really asbestos? if so get rid of it. The fibers in asbestos are lethal, and it's no longer environmentally legal to use it. Since about 1978 I think.
dick seiders 120093

[dick seiders]

MMiller, Lockwood no longer supplies the 956143, nor the 956141 11mm hose. They sell 956140 (11mm) for both of the old numbers. It comes in bulk but they'll sell you enough for the two lengths required for about $17.
All your other hose info was right on. Thanks.
BTW, Leaf says they don't have any?? So Lockwood is the place to go for those needing them.
dick seiders 120093


Oops! that was in your post, but they will sell half of the length you mentioned for the $17.

[N223JH]

Pre-planning the 5-year ordeal... Got my order in to TS Flightlines for the fuel and oil hose assemblies. Looking at the Lockwood 5-year parts list for the cooling system wondering how well the larger diameter hose negotiates the bends. They show it as 25.4mm, i.d., I presume.

I could be wrong but the person I spoke to at Lockwood did not seem to be aware of RV-12 differentiation from other 912 configurations and assured me the parts list was all I needed.

What has been the experience among the 100 or so RV-12's certified before mine regarding the applicability of the aforementioned hose? Also, are y'all re-using the original clamps or retrofitting with conventional clamps?

TIA
Jim
#264 flying since 12/10

[rvbuilder2002]

Originally Posted by N223JH

Pre-planning the 5-year ordeal... Got my order in to TS Flightlines for the fuel and oil hose assemblies. Looking at the Lockwood 5-year parts list for the cooling system wondering how well the larger diameter hose negotiates the bends. They show it as 25.4mm, i.d., I presume.

I could be wrong but the person I spoke to at Lockwood did not seem to be aware of RV-12 differentiation from other 912 configurations and assured me the parts list was all I needed.

What has been the experience among the 100 or so RV-12's certified before mine regarding the applicability of the aforementioned hose? Also, are y'all re-using the original clamps or retrofitting with conventional clamps?

TIA
Jim
#264 flying since 12/10

I can't comment on the applicability of the Lockwood kit, but the spring clamps are used for a very specific reason, so I recommend not substituting screw clamps.