Today's Message Index:
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1. 09:10 AM - repair vs new vs overhaul (bjones@dmv.com)
2. 10:08 AM - Re: repair vs new vs overhaul (Pete Christensen)
3. 03:14 PM - Touring USA with folding wing plane and RV (bjones@dmv.com)
4. 03:55 PM - Re: repair vs new vs overhaul (Roger Lee)
Message 1
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| Subject: | repair vs new vs overhaul |
Roger,
My early s/n 912 in a model IV Kitfox shows evidence of right rear exhaust
leakage at the head to exhaust pipe.
Upon removal of the exhaust system I note that both rear exhaust pipes are
sloppy in their fit to the heads, so I suspect an overheat problem, at
least right at the exhaust ports??
So I bet I am in for two new heads (ouch $) and two new exhaust pipe ends
welded onto the existing pipes. Does this sound right?
Oh, the two rear exhaust pipes do not push up into the front head exhaust
ports, probably because of a bit of exhaust crud build up on the old
pipes, however the pipes do look round to my lay person's eye with a bit
of surface crud on the outside where they fit into the exhaust port.
I bought the plane about 15 years ago with 60 hours at that time, have
flown it another roughly 400 and have never seen any indication of
overheating on gauges, no leaking of oil at heads indicating warpage of
heads nor has the coolant boiled over at least since I have owned it?
So next question, what might be the cause? If I put two new heads on is
the problem likely to recur? Any guidance here could be very useful.
Since new heads are expensive, what are the rules of thumb about just
selling the engine and getting a "factory overhaul" if such exists, or
getting aa new engine on exchange from Rotax? I recall hearing that Rotax
offered a "good deal" on new engines in exchange for old engines, if the
case of the old engine is good?
I bet others would be interested in some general guidelines on this from a
trained and experienced Rotax specialist such as yourself.
Thanks in advance for any guidance!
BJ
Kitfox IV 1050, Rotax 912
bjones@dmv.com
443-480-1023
>
> Hi Hugh,
>
> The problem has been that not everyone has a gascolator or a fuel filter
> far enough downstream. the main hose offenders isn't from hose before the
> fuel pump because it has a filter screen inside, but from hose past the
> pump. The fuel hose from the pump pressure side out is a problem at times.
> Some 912's have the stainless steel lines mounted from the fuel
> distribution block mounted on the carb balance tube, some don't. Some have
> the red Teflon fuel line from this point and some have just rubber fuel
> line right out of the pump to the carbs.
>
> Read this and you'll get a better handle on what some of the issues have
> been. My original post here was to just give you another tool in your
> mental toolbox for the "just in case" scenario.
>
> http://www.rotax-owner.com/rotax-blog/item/21-rotax-5-year-rubber-replacement-the-installation-considerations
>
> --------
> Roger Lee
> Tucson, Az.
> Light Sport Repairman - Maintenance Rated
> Rotax Repair Center - Heavy Maint. Rated
> Home 520-574-1080 TRY HOME FIRST
> Cell 520-349-7056
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=399964#399964
>
>
Message 2
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| Subject: | Re: repair vs new vs overhaul |
Your not flying enough. ;-)
Pete
On May 29, 2013, at 11:09 AM, bjones@dmv.com wrote:
>
> Roger,
>
> My early s/n 912 in a model IV Kitfox shows evidence of right rear exhaust
> leakage at the head to exhaust pipe.
>
> Upon removal of the exhaust system I note that both rear exhaust pipes are
> sloppy in their fit to the heads, so I suspect an overheat problem, at
> least right at the exhaust ports??
>
> So I bet I am in for two new heads (ouch $) and two new exhaust pipe ends
> welded onto the existing pipes. Does this sound right?
>
> Oh, the two rear exhaust pipes do not push up into the front head exhaust
> ports, probably because of a bit of exhaust crud build up on the old
> pipes, however the pipes do look round to my lay person's eye with a bit
> of surface crud on the outside where they fit into the exhaust port.
>
> I bought the plane about 15 years ago with 60 hours at that time, have
> flown it another roughly 400 and have never seen any indication of
> overheating on gauges, no leaking of oil at heads indicating warpage of
> heads nor has the coolant boiled over at least since I have owned it?
>
> So next question, what might be the cause? If I put two new heads on is
> the problem likely to recur? Any guidance here could be very useful.
>
> Since new heads are expensive, what are the rules of thumb about just
> selling the engine and getting a "factory overhaul" if such exists, or
> getting aa new engine on exchange from Rotax? I recall hearing that Rotax
> offered a "good deal" on new engines in exchange for old engines, if the
> case of the old engine is good?
>
> I bet others would be interested in some general guidelines on this from a
> trained and experienced Rotax specialist such as yourself.
>
> Thanks in advance for any guidance!
>
> BJ
> Kitfox IV 1050, Rotax 912
> bjones@dmv.com
> 443-480-1023
>
>
>
>
>>
>> Hi Hugh,
>>
>> The problem has been that not everyone has a gascolator or a fuel filter
>> far enough downstream. the main hose offenders isn't from hose before the
>> fuel pump because it has a filter screen inside, but from hose past the
>> pump. The fuel hose from the pump pressure side out is a problem at times.
>> Some 912's have the stainless steel lines mounted from the fuel
>> distribution block mounted on the carb balance tube, some don't. Some have
>> the red Teflon fuel line from this point and some have just rubber fuel
>> line right out of the pump to the carbs.
>>
>> Read this and you'll get a better handle on what some of the issues have
>> been. My original post here was to just give you another tool in your
>> mental toolbox for the "just in case" scenario.
>>
>> http://www.rotax-owner.com/rotax-blog/item/21-rotax-5-year-rubber-replacement-the-installation-considerations
>>
>> --------
>> Roger Lee
>> Tucson, Az.
>> Light Sport Repairman - Maintenance Rated
>> Rotax Repair Center - Heavy Maint. Rated
>> Home 520-574-1080 TRY HOME FIRST
>> Cell 520-349-7056
>>
>>
>>
>>
>> Read this topic online here:
>>
>> http://forums.matronics.com/viewtopic.php?p=399964#399964
>
>
>
>
>
>
Message 3
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| Subject: | Touring USA with folding wing plane and RV |
Pete,
You are right, I don't fly enough.
On the flip side of that coin the flying that I do in the Kitfox is pretty
unusual and spectacular. Each year I spend several weeks at a time in
great flying locations, flying low and slow down in the scenery in
Monument Valley, Canyon Lands, Valley of the Gods, Lake Powell, the
Florida Keys, the Down East Maine coast line, in the Grand Canyon, along
the Texas Gulf Coast playing on those desolate beaches, among many other
beautiful spots.
For the last ten years or so, I have towed the Kitfox in an enclosed car
trailer-mobile hanger-shop behind a slick little motorhome, flying at
these great locations when the weather is near perfect and enjoying
touring by road in the little motorhome otherwise.
(With over a decade of doing this I have learned a lot in terms of trailer
selection, protecting the plane while towing, accessing airports or
"getting thru the airport gate after 911", quick and easy loading and
loading the plane from the trailer, saving on costs and where to enjoy
flying. At the suggestion of EAA's Sport Plane representative, Ron
Wagner, and EAA's senior magazine editor, Mary Jones, I recently started
sharing my love of flying by doing forums at Sun N Fun, Sebring Sport
Plane Expo, etc. on "Tips On How To Tow Your Folding Wing Plane and Tour
The USA By LSA And Chevrolet". )
Being retired - Life Is Good!
BJ
Kitfox IV 1050 Rotax 912 80hp
> <pchristensen10@austin.rr.com>
>
> Your not flying enough. ;-)
>
> Pete
>
>
> On May 29, 2013, at 11:09 AM, bjones@dmv.com wrote:
>
>>
>> Roger,
>>
>> My early s/n 912 in a model IV Kitfox shows evidence of right rear
>> exhaust
>> leakage at the head to exhaust pipe.
>>
>> Upon removal of the exhaust system I note that both rear exhaust pipes
>> are
>> sloppy in their fit to the heads, so I suspect an overheat problem, at
>> least right at the exhaust ports??
>>
>> So I bet I am in for two new heads (ouch $) and two new exhaust pipe
>> ends
>> welded onto the existing pipes. Does this sound right?
>>
>> Oh, the two rear exhaust pipes do not push up into the front head
>> exhaust
>> ports, probably because of a bit of exhaust crud build up on the old
>> pipes, however the pipes do look round to my lay person's eye with a bit
>> of surface crud on the outside where they fit into the exhaust port.
>>
>> I bought the plane about 15 years ago with 60 hours at that time, have
>> flown it another roughly 400 and have never seen any indication of
>> overheating on gauges, no leaking of oil at heads indicating warpage of
>> heads nor has the coolant boiled over at least since I have owned it?
>>
>> So next question, what might be the cause? If I put two new heads on is
>> the problem likely to recur? Any guidance here could be very useful.
>>
>> Since new heads are expensive, what are the rules of thumb about just
>> selling the engine and getting a "factory overhaul" if such exists, or
>> getting aa new engine on exchange from Rotax? I recall hearing that
>> Rotax
>> offered a "good deal" on new engines in exchange for old engines, if the
>> case of the old engine is good?
>>
>> I bet others would be interested in some general guidelines on this from
>> a
>> trained and experienced Rotax specialist such as yourself.
>>
>> Thanks in advance for any guidance!
>>
>> BJ
>> Kitfox IV 1050, Rotax 912
>> bjones@dmv.com
>> 443-480-1023
Message 4
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| Subject: | Re: repair vs new vs overhaul |
Hi BJ,
I doubt that high temp issue caused this. The most likely cause is the pulsation
from the exhaust causes the tubes to vibrate and move which wears down the metal.
Some wear completely through. I would bet your engine is just fine and wouldn't
think about a new one or rebuilding. I would however replace the exhaust.
The joints should be lubed every couple hundred hours with copper anti seize.
Also make sure any nuts, bolts and springs on the exhaust are tight and or
up at torque. This will help eliminate the wear.
--------
Roger Lee
Tucson, Az.
Light Sport Repairman - Maintenance Rated
Rotax Repair Center - Heavy Maint. Rated
Home 520-574-1080 TRY HOME FIRST
Cell 520-349-7056
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=401548#401548
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