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aeroquip

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sportypilot(at)stx.rr.com
Guest

Posted: Sat Apr 01, 2006 3:25 pm Post subject: aeroquip

I have a quick question, I have steel aeroquip hose fittings on my engine 

oil in and out fittings and

wanted to know if the aluminum hose fittings will work ok with the steel 

fittings.. and also steel on the

oil cooler 7 row vans type.. or will this cause problems ? they are both the 

same brand and degree..

just one is half is steel and the hose fitting is aluminum.. any ideas ?



Danny..

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jackanet(at)hotmail.com
Guest

Posted: Sat Apr 01, 2006 4:02 pm Post subject: aeroquip

Danny,



No known problem mixing al and steel oil fittings as long as your respect 

torque limits... my humble opinion. You may be thinking of dissimilar metal 

problems mating copper and aluminum in electrical circuits.



Jack,   N-8VZ



 	  Quote: 	
		  From: "Sportypilot" <sportypilot(at)stx.rr.com>

Reply-To: rv-list(at)matronics.com

To: <rv-list(at)matronics.com>

Subject: aeroquip

Date: Sat, 1 Apr 2006 17:18:35 -0600

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pitts_pilot(at)bellsouth.
Guest

Posted: Sat Apr 01, 2006 4:49 pm Post subject: aeroquip

AFAIK, the only problem occurs with crossthreading ..... easy to do with 

steel fittings and aluminum nuts.  The prime reason for using steel 

under the cowl is it's higher melting point in case of a fire in the 

cowl.  I'm not a purist here either .... I've used whatever I had on 

hand to get the job done.

Linn

do not archive

Sportypilot wrote:



 	  Quote: 	
		  



I have a quick question, I have steel aeroquip hose fittings on my engine 

oil in and out fittings and

wanted to know if the aluminum hose fittings will work ok with the steel 

fittings.. and also steel on the

oil cooler 7 row vans type.. or will this cause problems ? they are both the 

same brand and degree..

just one is half is steel and the hose fitting is aluminum.. any ideas ?



Danny..

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chaztuna(at)adelphia.net
Guest

Posted: Sat Apr 01, 2006 5:47 pm Post subject: aeroquip

Linn,

  Steel fittings are used under the cowl more for their resistance to 

fatigue. Remember, we have that wet dog named Lycoming sitting up 

there, impersonating a paint mixing machine!  A cracked aluminum 

fitting could get really expensive if an oil or fuel fitting fails in flight.

Charlie Kuss

 	  Quote: 	

AFAIK, the only problem occurs with crossthreading ..... easy to do with

steel fittings and aluminum nuts.  The prime reason for using steel

under the cowl is it's higher melting point in case of a fire in the

cowl.  I'm not a purist here either .... I've used whatever I had on

hand to get the job done.

Linn

do not archive

Sportypilot wrote:

 >

 >

 >I have a quick question, I have steel aeroquip hose fittings on my engine

 >oil in and out fittings and

 >wanted to know if the aluminum hose fittings will work ok with the steel

 >fittings.. and also steel on the

 >oil cooler 7 row vans type.. or will this cause problems ? they 

 are both the

 >same brand and degree..

 >just one is half is steel and the hose fitting is aluminum.. any ideas ?

 >

 >

 >

 >Danny..

 >

 >

 >

 >

 >

 >

 >

 >

 >

 >

 >

 >

 >

 >

 >

 >

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Larry Bowen

Joined: 09 Jan 2006
Posts: 802
Location: NC, USA

Posted: Sat Apr 01, 2006 6:18 pm Post subject: aeroquip

Mine has worked ok so far.  Same setup.



-

Larry Bowen

Larry(at)BowenAero.com

http://BowenAero.com

 



[quote] --

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_________________
Larry Bowen
RV-8 SOLD,
RV-7QB in progress...

pitts_pilot(at)bellsouth.
Guest

Posted: Sat Apr 01, 2006 6:34 pm Post subject: aeroquip

Valid point, I guess.  I've never seen a cracked aluminum fitting (in my 

limited experience) due to vibration .  I've balanced a few REALLY 

out-of-balance props and have seen stress cracks in aluminum and some 

steel.  The only AN fittings that were cracked came from a gorilla with 

a wrench!  In one case, there were impressions left in the flat of the 

aluminum nut from the wrench.

Linn

Charlie Kuss wrote:

 	  Quote: 	

Linn,

  Steel fittings are used under the cowl more for their resistance to 

fatigue. Remember, we have that wet dog named Lycoming sitting up 

there, impersonating a paint mixing machine!  A cracked aluminum 

fitting could get really expensive if an oil or fuel fitting fails in flight.

Charlie Kuss

>

>

>AFAIK, the only problem occurs with crossthreading ..... easy to do with

>steel fittings and aluminum nuts.  The prime reason for using steel

>under the cowl is it's higher melting point in case of a fire in the

>cowl.  I'm not a purist here either .... I've used whatever I had on

>hand to get the job done.

>Linn

>do not archive

>Sportypilot wrote:

>

>    

>

>>

>>

>>I have a quick question, I have steel aeroquip hose fittings on my engine

>>oil in and out fittings and

>>wanted to know if the aluminum hose fittings will work ok with the steel

>>fittings.. and also steel on the

>>oil cooler 7 row vans type.. or will this cause problems ? they 

>>      

>>

>are both the

>    

>

>>same brand and degree..

>>just one is half is steel and the hose fitting is aluminum.. any ideas ?

>>

>>

>>

>>Danny..

>>

>>

>>

>>

>>

>>

>>

>>

>>

>>

>>

>>

>>

>>

>>

>>

>>      

>>

>

>

>    

>

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chaztuna(at)adelphia.net
Guest

Posted: Sat Apr 01, 2006 7:27 pm Post subject: aeroquip

Linn,

  Yes, improper installation goes a long way towards ruining aluminum 

hydraulic fittings. Actually, most certified aircraft use the steel 

fitting on anything that actually goes on the engine or moves with 

the engine. Items on the firewall don't shake to much.

Charlie

 	  Quote: 	
		  



Valid point, I guess.  I've never seen a cracked aluminum fitting (in my

limited experience) due to vibration .  I've balanced a few REALLY

out-of-balance props and have seen stress cracks in aluminum and some

steel.  The only AN fittings that were cracked came from a gorilla with

a wrench!  In one case, there were impressions left in the flat of the

aluminum nut from the wrench.

Linn

Charlie Kuss wrote:



 >

 >

 >Linn,

 >  Steel fittings are used under the cowl more for their resistance to

 >fatigue. Remember, we have that wet dog named Lycoming sitting up

 >there, impersonating a paint mixing machine!  A cracked aluminum

 >fitting could get really expensive if an oil or fuel fitting fails 

 in flight.

 >Charlie Kuss

 >

 >

 >

 >

 >>

 >>

 >>AFAIK, the only problem occurs with crossthreading ..... easy to do with

 >>steel fittings and aluminum nuts.  The prime reason for using steel

 >>under the cowl is it's higher melting point in case of a fire in the

 >>cowl.  I'm not a purist here either .... I've used whatever I had on

 >>hand to get the job done.

 >>Linn

 >>do not archive

 >>Sportypilot wrote:

 >>

 >>

 >>

 >>>

 >>>

 >>>I have a quick question, I have steel aeroquip hose fittings on my engine

 >>>oil in and out fittings and

 >>>wanted to know if the aluminum hose fittings will work ok with the steel

 >>>fittings.. and also steel on the

 >>>oil cooler 7 row vans type.. or will this cause problems ? they

 >>>

 >>>

 >>are both the

 >>

 >>

 >>>same brand and degree..

 >>>just one is half is steel and the hose fitting is aluminum.. any ideas ?

 >>>

 >>>

 >>>

 >>>Danny..

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Vanremog(at)aol.com
Guest

Posted: Sun Apr 02, 2006 12:39 am Post subject: aeroquip

In a message dated 4/1/2006 3:26:31 P.M. Pacific Standard Time,  

sportypilot(at)stx.rr.com writes:



I have a  quick question, I have steel aeroquip hose fittings on my engine 

oil in  and out fittings and

wanted to know if the aluminum hose fittings will work  ok with the steel 

fittings.. and also steel on the

oil cooler 7 row  vans type.. or will this cause problems ? they are both the 

same brand and  degree..

just one is half is steel and the hose fitting is aluminum.. any  ideas ?



===============================

 

I used stainless nipple fittings on the engine and aluminum fittings on the  

AQP hoses.  A light coating of Fuelube on just the sealing facets  and threads 

probably couldn't hurt (unless you reduce the friction so much that  the 

fitting vibrates loose) and it may eliminate the galling that can occur even  when 

using aluminum pipe threads into aluminum.

 

Once again, the theory is generally to avoid dissimilar metals combinations  

that are farthest apart on the galvanic table and keep them dry.  It is  

possible that, with new fittings, the anodizing may have some galvanic blocking  

effect, effectively breaking up the galvanic couple between any dissimilar  

parent metals.  



GV (RV-6A  N1GV O-360-A1A, C/S, Flying 777hrs, Silicon Valley, CA)

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