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What reducer to use?
- Thread starter crabandy
- Start date
frazitl
Well Known Member
Looks like
you have an AN-8 to an AN-6 reducing union in your photo. It's a tube to tube connection. If the hole in your case is about 5/8" diameter, it is probably a 3/8" pipe thread. Pipe treads are called out based on the nominal ID of the pipe on which the thread would be used. I think you want an AN816-6-6 fitting (Check out this link: http://www.aircraft-spruce.com/catalog/hapages/an816.php . 45 degree fittings are also available to clear the motor mount on the accessory case outlet hole. Install before mounting your engine! I would use steel to prevent galling of the aluminum thread$$ in your accessory case. This fitting is for 3/8" hose fitting and a 3/8" pipe thread. If you're using a cooler with fittings for 1/2" hose (use steel here too), you want AN816-8 fittings in your accessory case.
Doing this from memory without my plane within reach. YMMV
you have an AN-8 to an AN-6 reducing union in your photo. It's a tube to tube connection. If the hole in your case is about 5/8" diameter, it is probably a 3/8" pipe thread. Pipe treads are called out based on the nominal ID of the pipe on which the thread would be used. I think you want an AN816-6-6 fitting (Check out this link: http://www.aircraft-spruce.com/catalog/hapages/an816.php . 45 degree fittings are also available to clear the motor mount on the accessory case outlet hole. Install before mounting your engine! I would use steel to prevent galling of the aluminum thread$$ in your accessory case. This fitting is for 3/8" hose fitting and a 3/8" pipe thread. If you're using a cooler with fittings for 1/2" hose (use steel here too), you want AN816-8 fittings in your accessory case.
Doing this from memory without my plane within reach. YMMV
My O-360's first life was in an enstrom helicopter, HO-360XXX with the single "dual" bendix mag. The current fitting pictured above is AN815-10D, With a 5/8 thread. I haven't found a fitting with 5/8 thread to 8 flare and a 90. I tried a AN912 but I have only found 3/4 and 1/2 to 3/8 flare. Last option would be to see if a 90 on my hose would fit.
More info needed
Andy,
Like Terry, it appears to me that the fitting in the photo you show is a reducer. [straight thread for hose to hose connection] Was this fitting screwed into your accessory case? If so, which end was fitted? What size is the other end?
As Walt mentioned, the accessory cases I've seen are all pipe thread [tapered thread] That does not mean that Enstrom [or a previous mechanic or owner] did not convert your cover to use the current fitting.
Please obtain a thread pitch gauge, to verify the pitch and type of threads in your accessory case. See
http://www.ask.com/wiki/Thread_pitch_gauge
The fitting above "can" be used, providing the case has been tapped for a straight thread. In that instance, an appropriate O-ring must be placed it the non-threaded crook between the threads and the hex section to accomplish a seal. More info needed to give informed advice.
Charlie
Andy,
Like Terry, it appears to me that the fitting in the photo you show is a reducer. [straight thread for hose to hose connection] Was this fitting screwed into your accessory case? If so, which end was fitted? What size is the other end?
As Walt mentioned, the accessory cases I've seen are all pipe thread [tapered thread] That does not mean that Enstrom [or a previous mechanic or owner] did not convert your cover to use the current fitting.
Please obtain a thread pitch gauge, to verify the pitch and type of threads in your accessory case. See
http://www.ask.com/wiki/Thread_pitch_gauge
The fitting above "can" be used, providing the case has been tapped for a straight thread. In that instance, an appropriate O-ring must be placed it the non-threaded crook between the threads and the hex section to accomplish a seal. More info needed to give informed advice.
Charlie
agirard7a
Well Known Member
Oil fittings
I just replaced mine from a 6 to an 8.
Vans specs out 8 hoses to the cooler.
http://www.aircraftspruce.com/catalog/hapages/an816.php
That is the wrong fitting you have shown.
You need a pipe fitting into the case.
Make sure it's steel not alum. Steel has much
Less chance of snapping off should you ever need to take it out.
I just replaced mine from a 6 to an 8.
Vans specs out 8 hoses to the cooler.
http://www.aircraftspruce.com/catalog/hapages/an816.php
That is the wrong fitting you have shown.
You need a pipe fitting into the case.
Make sure it's steel not alum. Steel has much
Less chance of snapping off should you ever need to take it out.
"The fitting above "can" be used, providing the case has been tapped for a straight thread. In that instance, an appropriate O-ring must be placed it the non-threaded crook between the threads and the hex section to accomplish a seal. More info needed to give informed advice."
Charlie, you are correct! The union fitting does have the O-ring and must be straight threads tapped into my accessory case. Are there any reducers/adapters (straight thread with O-ring - 3/8 NPT) for this?
Charlie, you are correct! The union fitting does have the O-ring and must be straight threads tapped into my accessory case. Are there any reducers/adapters (straight thread with O-ring - 3/8 NPT) for this?
A vertiable dirth of information
Yes, there are. However, you still have not answered my question. What size/thread has the accessory case been tapped for? Until you answer that, I can not help you.
Charlie
Yes, there are. However, you still have not answered my question. What size/thread has the accessory case been tapped for? Until you answer that, I can not help you.
Charlie
If your accessory case has already been tapped for 5/8" straight thread, you can not tap it out for 3/8" NPT, as the hole is already larger than the drill size for 3/8" NPT [which is 9/16"] See
http://www.engineershandbook.com/Tables/npttap.htm
Charlie
az_gila
Well Known Member
Perhaps it is this fitting you need?
http://www.jegs.com/i/Magnafuel/665/MP-3017/10002/-1?parentProductId=763113
AN8 flare to AN10 straight - the AN 10 straight portion is a 7/8-14 thread.
It will look pretty on the back of your engine...
It is probably also a AN 920-8-10 part in traditional blue or black, but seems harder to find -
http://www.bonaero.com/Plumbing.htm#BA920
http://www.jegs.com/i/Magnafuel/665/MP-3017/10002/-1?parentProductId=763113
AN8 flare to AN10 straight - the AN 10 straight portion is a 7/8-14 thread.
It will look pretty on the back of your engine...
It is probably also a AN 920-8-10 part in traditional blue or black, but seems harder to find -
http://www.bonaero.com/Plumbing.htm#BA920
Last edited:
az_gila
Well Known Member
That would be an AN921, but it doesn't seem to come in a -8 to -10 mix...
Think I finally found it, for $32.95!! 90 degree AN8 to male 7/8-14 straight o-ring boss fitting.
Hard to tell from the photo. Is the hex section threaded onto the straight threaded section? Or is it fixed. Do you have a part number or a web link for this item?
Charlie
http://m.summitracing.com/parts/ear-949083erl
I had the same question to the tech guy and be assured me it was a swivel and the nut was loose. We'll see....
I had the same question to the tech guy and be assured me it was a swivel and the nut was loose. We'll see....
Andy-----in industrial number you are looking for a 6801-10-08 NWO. The hex nut locks the fitting into place after you index it in the direction you want.
Thats a -10 straight boss, to a -8 flare 90*. Use a steel one. MUCH less expensive and stronger than an aluminum one.
Tom
Thats a -10 straight boss, to a -8 flare 90*. Use a steel one. MUCH less expensive and stronger than an aluminum one.
Tom
Andy,
I'll second Tom's advice to only use steel fittings on the engine. First, aluminum fittings into an aluminum engine promotes galling of the fittings. Most important is the added fatigue strength of steel fittings.
If an oil or fuel line fitting mounted to the engine breaks due to vibration or fatigue, it will ruin your whole day [not to mention your $$$ engine] This is not the place to try to save grams of weight.
Charlie
I'll second Tom's advice to only use steel fittings on the engine. First, aluminum fittings into an aluminum engine promotes galling of the fittings. Most important is the added fatigue strength of steel fittings.
If an oil or fuel line fitting mounted to the engine breaks due to vibration or fatigue, it will ruin your whole day [not to mention your $$$ engine] This is not the place to try to save grams of weight.
Charlie
hgerhardt
Well Known Member
Here's what you need
You mentioned you wanted that same fitting only in 90deg version? That would be a Parker 8-10 C5OX-S. I have one in my IO-360 dual mag engine.
The dual-mag engines DO NOT have NPT oil ports. They are -10 O-ring straight thread. The 8-10 C5OX-S, is -10 on the engine side with adjustment nut and O-ring, and -8 flare on the other for your oil cooler lines. The straight fitting in the OP's blurry pic is also -10 on the engine side and -8 on the hose side.
Here's a vendor with one: http://www.livingstonandhavenstore....-male-jic-by-10-male-sae-90-degree-elbow.html
These are steel, by the way, as all fittings in the oil cooler system should be.
You mentioned you wanted that same fitting only in 90deg version? That would be a Parker 8-10 C5OX-S. I have one in my IO-360 dual mag engine.
The dual-mag engines DO NOT have NPT oil ports. They are -10 O-ring straight thread. The 8-10 C5OX-S, is -10 on the engine side with adjustment nut and O-ring, and -8 flare on the other for your oil cooler lines. The straight fitting in the OP's blurry pic is also -10 on the engine side and -8 on the hose side.
Here's a vendor with one: http://www.livingstonandhavenstore....-male-jic-by-10-male-sae-90-degree-elbow.html
These are steel, by the way, as all fittings in the oil cooler system should be.
