Flexible Oil Pressure Line
Moderators: GAHorn, Karl Towle, Bruce Fenstermacher
Re: Flexible Oil Pressure Line
Anyone put a restrictor on the fitting that leaves the case of the engine? As I was searching around the airport for a mandrel one of my friends recommended I put on a restrictor and be done with it. He told me to make one by soldering a fitting and drilling a smaller hole. Makes sense I guess.
Re: Flexible Oil Pressure Line
A restricter fitting is recommended to restrict the overboard pumping of oil in the event of a pressure line breakage.
BL
- Bruce Fenstermacher
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Re: Flexible Oil Pressure Line
Mike, get an AN 816-2D which is aluminum. Solder it closed. Drill it out with a #60 drill which is .04" or as large as a 1/32" which is .03125".
See this thread for discussion: http://www.cessna170.org/forums/viewtop ... restrictor
Correction: Had a brain fart. I must have found a steel AN 816 or maybe I got lucky and found a brass AN 816-2B. But the solder won't work with the aluminum. I just tried it.
See this thread for discussion: http://www.cessna170.org/forums/viewtop ... restrictor
Correction: Had a brain fart. I must have found a steel AN 816 or maybe I got lucky and found a brass AN 816-2B. But the solder won't work with the aluminum. I just tried it.
CAUTION - My forum posts may be worth what you paid for them!
Bruce Fenstermacher, Past President, TIC170A
Email: brucefenster at gmail.com
Bruce Fenstermacher, Past President, TIC170A
Email: brucefenster at gmail.com
Re: Flexible Oil Pressure Line
Bruce,
What kind of solder do you recommend for closing down the hole in that aluminum fitting?
What kind of solder do you recommend for closing down the hole in that aluminum fitting?
BL
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- Posts: 73
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Re: Flexible Oil Pressure Line
I would think this stuff might work pretty good.
http://www.ebay.com/bhp/hts-2000-brazing-rods
I have a friend that has used it for repairs on his ATV with amazing results???
Gary
http://www.ebay.com/bhp/hts-2000-brazing-rods
I have a friend that has used it for repairs on his ATV with amazing results???
Gary
Re: Flexible Oil Pressure Line
Thanks Bruce! Sounds like what I was told out at the airport today! Thanks for the part number for the fitting.
- Bruce Fenstermacher
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Re: Flexible Oil Pressure Line
I used regular old 60/40. Clean the hole and use flux. Nothing fancy. Same stuff I use on copper water pipe.blueldr wrote:Bruce,
What kind of solder do you recommend for closing down the hole in that aluminum fitting?
CAUTION - My forum posts may be worth what you paid for them!
Bruce Fenstermacher, Past President, TIC170A
Email: brucefenster at gmail.com
Bruce Fenstermacher, Past President, TIC170A
Email: brucefenster at gmail.com
Re: Flexible Oil Pressure Line
Under the circumstances above, I'm amazed that 60/40 lead/tin solder will bond to that aluminum fitting.
BL
- Bruce Fenstermacher
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- Joined: Tue Apr 23, 2002 11:24 am
Re: Flexible Oil Pressure Line
I thought the same thing until I tried it.blueldr wrote:Under the circumstances above, I'm amazed that 60/40 lead/tin solder will bond to that aluminum fitting.
Of course now your making me wonder if I might have used a silver solder. But I don't think that silver would work any bettor or worse than lead/tin. I know one thing I used what was on my bench and I don't have anything exotic there. Now I'm going to have to get a fitting and do it again to be sure I'm reporting correctly.
CAUTION - My forum posts may be worth what you paid for them!
Bruce Fenstermacher, Past President, TIC170A
Email: brucefenster at gmail.com
Bruce Fenstermacher, Past President, TIC170A
Email: brucefenster at gmail.com
- Bruce Fenstermacher
- Posts: 10318
- Joined: Tue Apr 23, 2002 11:24 am
Re: Flexible Oil Pressure Line
BL your sharp as a tack.Bruce Fenstermacher wrote:I thought the same thing until I tried it.blueldr wrote:Under the circumstances above, I'm amazed that 60/40 lead/tin solder will bond to that aluminum fitting.
Of course now your making me wonder if I might have used a silver solder. But I don't think that silver would work any bettor or worse than lead/tin. I know one thing I used what was on my bench and I don't have anything exotic there. Now I'm going to have to get a fitting and do it again to be sure I'm reporting correctly.
Correction: Had a brain fart. I must have found a steel AN 816 or maybe I got lucky and found a brass AN 816-2B. But the solder won't work with the aluminum. I just tried it.
CAUTION - My forum posts may be worth what you paid for them!
Bruce Fenstermacher, Past President, TIC170A
Email: brucefenster at gmail.com
Bruce Fenstermacher, Past President, TIC170A
Email: brucefenster at gmail.com
Re: Flexible Oil Pressure Line
One might also braze a brass fitting. (I believe there's an actual part no. for this restrictor fitting....I'd look in my records but our home desktop computer died and this is the first time I've logged onto (another) new computer and haven't transferred all my data from the old hard drive yet. They keep making things that aren't back-compatible....)
'53 B-model N146YS SN:25713
50th Anniversary of Flight Model. Winner-Best Original 170B, 100th Anniversary of Flight Convention.
An originality nut (mostly) for the right reasons.
50th Anniversary of Flight Model. Winner-Best Original 170B, 100th Anniversary of Flight Convention.
An originality nut (mostly) for the right reasons.
- Bruce Fenstermacher
- Posts: 10318
- Joined: Tue Apr 23, 2002 11:24 am
Re: Flexible Oil Pressure Line
If you have a brass fitting I'd just solder it. In order to braze it you need to melt the brass rod and the heat will likely melt the fitting. All the "factory" parts I've seen are brass with solder. BTW brass AN fittings are not easy to get.
I don't remember if this fitting does have a part number. I know the primer fitting that sprays fuel in the manifold has a part number but that is different.
Here is another solution,
Tap out the fitting for a 1/4-20 set screw. Use lock tight to set the screw then drill it. The AN816-2 fitting I have is already a perfect #7 size hole for the 1/4-20 threads. If you wanted to use a 1/4-28 set screw you would have to drill out the AN816 with a #3 drill according to my charts. You would also need a bottom tap to get enough threads in the fitting to hold the set screw.
I don't remember if this fitting does have a part number. I know the primer fitting that sprays fuel in the manifold has a part number but that is different.
Here is another solution,
Tap out the fitting for a 1/4-20 set screw. Use lock tight to set the screw then drill it. The AN816-2 fitting I have is already a perfect #7 size hole for the 1/4-20 threads. If you wanted to use a 1/4-28 set screw you would have to drill out the AN816 with a #3 drill according to my charts. You would also need a bottom tap to get enough threads in the fitting to hold the set screw.
CAUTION - My forum posts may be worth what you paid for them!
Bruce Fenstermacher, Past President, TIC170A
Email: brucefenster at gmail.com
Bruce Fenstermacher, Past President, TIC170A
Email: brucefenster at gmail.com
Re: Flexible Oil Pressure Line
What do you do when that set screw comes out an drops down into the engine? (Unlikely, I know, but if you recall Voorhees story about the illegal oil restrictor fitting that caused the loss of the airplane..
Maybe put the set screw in the pressure-line side...?
I like the brazing or silver soldering idea best....but I KNOW there's an actual PN for this thing, and who cannot afford the price of airplane parts?
Maybe put the set screw in the pressure-line side...?
I like the brazing or silver soldering idea best....but I KNOW there's an actual PN for this thing, and who cannot afford the price of airplane parts?
'53 B-model N146YS SN:25713
50th Anniversary of Flight Model. Winner-Best Original 170B, 100th Anniversary of Flight Convention.
An originality nut (mostly) for the right reasons.
50th Anniversary of Flight Model. Winner-Best Original 170B, 100th Anniversary of Flight Convention.
An originality nut (mostly) for the right reasons.
Re: Flexible Oil Pressure Line
To make a restrctor fitting, use a brass or steel fitting, either may be bonded with 50/50 or 60/49 solder using a soldering iron and a flux. Silver solder will also do a nice job, but a soldering iron will not produce the necessary heat and a torch will be required to generate enough heat to melt the silver solder. Use of a torch requires diligence to keep from burning the base metal surface which will preclude acquiring a proper bond. A number 60 drill hole will be fine but if you're drilling into lead based solder you must be very careful to keep the little no. 60 drill bit from biteing into the solft solder too quickly and snapping off. Drilling into a soft medium must be done carefully to keep the drill bit from grabbing.
BL
Re: Flexible Oil Pressure Line
Here's how the Stearman guys do it.
http://www.stearman.net/index.php/oil-p ... estrictor/
http://www.stearman.net/index.php/oil-p ... estrictor/
Karl
'53 170B N3158B SN:25400
ASW-20BL
'53 170B N3158B SN:25400
ASW-20BL