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Guy Buchanan
Joined: 16 Jul 2006
Posts: 1204
Location: Ramona, CA
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 Posted: Thu Mar 27, 2014 6:25 pm Post subject: Oil Lines and Aluminum AN Fittings |
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Anybody using aluminum AN fittings on their oil lines on a 912? With an
oil cooler? For approximately how many hours? I've been told I must
convert to steel for all the oil line end fittings. Tough to do with AN
fittings and decent routing.
Next: Anybody using AN non-banjo fittings to attach fuel lines to the
carbs? I found an 8mm male to -3 AN male steel adapter, but have 1/4"
fuel lines so need to convert to -4. I can only find -3 AN to -4 AN
converters in aluminum.
Guy Buchanan
Ramona, CA
Kitfox IV-1200 / 912-S / Warp 3cs / 500 hrs. and grounded
Now a glider pilot, too.
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Guy Buchanan
Deceased K-IV 1200
A glider pilot too. |
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lcfitt(at)sbcglobal.net
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| Posted: Thu Mar 27, 2014 8:33 pm Post subject: Oil Lines and Aluminum AN Fittings |
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I am curious where the advice came from. It is the first time I have
heard this after almost 20 years on various lists and forums. To your
specific question - 912 UL 900 hours. I wonder about the wisdom and
more specifically the reason for using steel fittings on an aluminum
engine block.
Lowell
Model IV-1200
912 UL
On 3/27/2014 7:24 PM, Guy Buchanan wrote:
| Quote: |
Anybody using aluminum AN fittings on their oil lines on a 912? With
an oil cooler? For approximately how many hours? I've been told I must
convert to steel for all the oil line end fittings. Tough to do with
AN fittings and decent routing.
Next: Anybody using AN non-banjo fittings to attach fuel lines to the
carbs? I found an 8mm male to -3 AN male steel adapter, but have 1/4"
fuel lines so need to convert to -4. I can only find -3 AN to -4 AN
converters in aluminum.
Guy Buchanan
Ramona, CA
Kitfox IV-1200 / 912-S / Warp 3cs / 500 hrs. and grounded
Now a glider pilot, too.
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markdonahue
Joined: 16 Dec 2012
Posts: 16
Location: bainbridge island washington
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| Posted: Fri Mar 28, 2014 9:51 am Post subject: Oil Lines and Aluminum AN Fittings |
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Guy,
I thought a little more about this. I remember reading articles in
Kitplanes on LO coolers, and that the cooler manufacturer recommended steel
fittings to the cooler as alumuminum fitting to the alum cooler would tend
to gall the threads, causing an issue if the cooler needs to be repaired.
They said removing the aluminum fitting from the cooler would probably
damage the cooler. I am builing an RV 9a and purchased the firewall forward
parts from Vans. In the kit the lube oil hoses have AN 818 fittings that
are steel or stainless steel (slightly magnetic) on the ends that goes to an
AN 822 fitting that screws into the cooler. In this case Vans supplied an
aluminum AN 822 fittings.
I used proper dope when assembling so I presume I could get the alum fitting
out of the cooler without damage should the need arise in the future, but
who knows.
It is not that big of a deal to use the steel AN fitting in leu of the
aluminum, but I don't know of any reason other than the above to do it.
Hope this helps.
Mark Donahue
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Mark Donahue |
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7suds(at)chartermi.net
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| Posted: Fri Mar 28, 2014 2:39 pm Post subject: Oil Lines and Aluminum AN Fittings |
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Would brass be an option?
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brubakermal(at)yahoo.com
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| Posted: Fri Mar 28, 2014 3:12 pm Post subject: Oil Lines and Aluminum AN Fittings |
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i need a aftermarket starter for my rotax 582 i herd napa has one anyone have the Part # please. mal
Malcolm & Jeanne Brubaker
Michigan Sport Pilot Repair
http://michigansportpilotrepair.com/
LSRM-A, PPC, WS
Great Sails - Sailmaker
for Ultralight & Light Sport
(989)513-3022
From: Lloyd Cudnohufsky <7suds(at)chartermi.net>
To: kitfox-list(at)matronics.com
Sent: Friday, March 28, 2014 6:28 PM
Subject: RE: Oil Lines and Aluminum AN Fittings
--> Kitfox-List message posted by: "Lloyd Cudnohufsky" <7suds(at)chartermi.net (7suds(at)chartermi.net)>
Would brass be an option?
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jrevens
Joined: 21 Nov 2013
Posts: 34
Location: Arvada, CO
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| Posted: Fri Mar 28, 2014 3:43 pm Post subject: Oil Lines and Aluminum AN Fittings |
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I believe the practice of using steel fittings in these applications comes directly from experience with Lycoming, Continental, & other common aircraft engines, probably filtering down to other engine types. The reason for using steel is because of the potential for an aluminum fitting to crack/fail in these critical applications. I’ll grant you that it is probably rare, but there have been documented cases of that happening. There doesn’t seem to be a particular problem with steel & an aluminum case… there are usually all kinds of steel parts attached to & used on most engines by the manufacturer – fittings & other hardware. The steel fittings should be aircraft quality (AN or MS).
[b] [/b][b]John Evens [/b][b] [/b]
[quote][b]
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John Evens
Thorp T-18 N71JE (sold)
Kitfox SS7 N27JE (built & flying) |
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lcfitt(at)sbcglobal.net
Guest
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| Posted: Fri Mar 28, 2014 4:29 pm Post subject: Oil Lines and Aluminum AN Fittings |
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I find this discussion fascinating. I guess I will stick by my opinion
- not an A&P or engineer, just an inveterate tinkerer. I would think
that there might be a possible issue with coolant as it is potentially
corrosive, but oil or fuel" Maybe fuel due to the hydrophilic ethanol,
but I have aluminum AN Fittings there with aluminum nuts to secure the
flared tubing and did so in the 900 hour IV. Logic would tell me that
if aluminum to aluminum was an issue, the fitting would be aluminum and
the nut would be stainless, from the manufacturer. Both my oil cooler
and the heater core have large hex bosses on both. I always secure
these with a wrench before putting a wrench on the AN fitting. Again,
not an expert - just still wondering about the Whys.
Lowell
On 3/28/2014 3:28 PM, Lloyd Cudnohufsky wrote:
[quote]
Would brass be an option?
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n223rv(at)wolflakeairport
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| Posted: Fri Mar 28, 2014 6:08 pm Post subject: Oil Lines and Aluminum AN Fittings |
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Actually the issue is aluminum fittings on an aluminum oil cooler will gall and bind together making the fittings impossible to remove. If you try, it strips the threads on the oil cooler. I lost a $200 oil cooler trying to re tighten the fittings.
Sent from my iPhone
On Mar 28, 2014, at 7:32 PM, "John Evens" <jrevens(at)comcast.net (jrevens(at)comcast.net)> wrote:
[quote]
I believe the practice of using steel fittings in these applications comes directly from experience with Lycoming, Continental, & other common aircraft engines, probably filtering down to other engine types
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jrevens
Joined: 21 Nov 2013
Posts: 34
Location: Arvada, CO
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| Posted: Sat Mar 29, 2014 3:48 pm Post subject: Oil Lines and Aluminum AN Fittings |
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I’ve used aluminum fittings successfully with oil coolers. Galling can be a problem, but doesn’t have to be. Aluminum AN fittings are hard anodized, and oil coolers usually are not. As long as you use a good thread sealing/lubricating compound, & don’t over-tighten (most important), you won’t gall the threads. Bare aluminum against bare aluminum is much more of a problem, but the anodized fitting can be successfully used with aluminum that is not. The admonition to use steel fittings on carburetors, oil pressure lines, etc. is definitely rooted, at least partially, in the fact that there is a lot of vibration on & around an engine, and steel is much stronger, heat resistant, & less prone to fatigue and cracking.
Brass also work hardens & can be prone to cracking. Anodized aluminum is fine as far as compatibility with fuel is concerned.
John Evens
Time: 07:08:51 PM PST US
Subject: Re: Oil Lines and Aluminum AN Fittings
From: Michael Kraus <n223rv(at)wolflakeairport.net>
Actually the issue is aluminum fittings on an aluminum oil cooler will gall a nd bind together making the fittings impossible to remove. If you try, it s trips the threads on the oil cooler. I lost a $200 oil cooler trying to re t ighten the fittings.
Sent from my iPhone
[quote][b]
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John Evens
Thorp T-18 N71JE (sold)
Kitfox SS7 N27JE (built & flying) |
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