EDM830 Oil pressure transducer installation

[Martin S.]

Evening gents,

thinking how to install the EDM 830 oil pressure transducer to the existing oil pressure line in an elegant way. Current solution would be to insert an AN824 tee to original oil pressure line, right before the original transducer and connecting a new 303 hose to the tee and to the EDM transducer on the other side with the EDM transducer being mounted to the firewall. Anybody fotos of their install for inspiration?

 

Greets,

 

Martin

[DCarlton]

7 hours ago, Martin S. said:

Evening gents,

thinking how to install the EDM 830 oil pressure transducer to the existing oil pressure line in an elegant way. Current solution would be to insert an AN824 tee to original oil pressure line, right before the original transducer and connecting a new 303 hose to the tee and to the EDM transducer on the other side with the EDM transducer being mounted to the firewall. Anybody fotos of their install for inspiration?

 

Greets,

 

Martin

Great question. I believe my transducer is currently mounted directly to the T and the transducer is clamped to the engine mount.  I’ll see if I have a pic.  The folks that make the EDM will not offer a recommended solution or T fitting.   My first installation resulted in leaks.  Too many joints, too many small adapter fittings, too much vibration and torque on the fittings and you’ll have a leak.  

[Guest]

This is what I’ve done in the past.  The hole for each transducer goes straight through, the bottom is drilled and taped for fittings and hoses.

[Martin S.]

5 hours ago, M20Doc said:

This is what I’ve done in the past.  The hole for each transducer goes straight through, the bottom is drilled and taped for fittings and hoses.

That looks pretty nice. Already saw this in another post of yours. The EDM830 transducers are secondary. As such, this configuration requires three dedicated (additional) hoses from the respective original lines to the "tripple board". I´m hestitating between this setup and one where the EDM830 sensors are directly connected to Tees, without intermediate hoses.

[DCarlton]

Here's a pic of my original EDM transducer installation which resulted in oil leaks.  I'm not an aviation mechanic (only an aircraft owner / engineer), but I believe the small adapter fittings caused the leak.  There was simply too much vibration and torque on those small fittings for them not to loosen and leak.  We ended up replacing all of the blue fittings with a single T that connects directly to the hoses and transducer without the small adapter fittings. I was really surprised that JPI offered no help or solution whatsoever for their transducer installation; no recommended hardware; and no fittings.  Unfortunately I don't have a picture of the T that was eventually used but I haven't had a leak in over a year.  Again, I'm not a mechanic or expert, only a owner / pilot with some personal experience in this issue.  I'm really surprised there's not a clear best answer to what must be a common installation challenge.  Please post a pic of your solution.  Good luck.  

[jetdriven]

We use those AN tee fittings and -AN nipples all the time.  Works great. They are NPT pipe fittings and will leak if you don’t use a sealer like fuel lube or permatex aviation sealer. 

[DCarlton]

29 minutes ago, jetdriven said:

We use those AN tee fittings and -AN nipples all the time.  Works great. They are NPT pipe fittings and will leak if you don’t use a sealer like fuel lube or permatex aviation sealer. 

I'm sure, but in this case after looking at the physical arrangement of the hose and the way the transducer was mounted, I could see why it leaked.  Way too much twisting on the hose when the engine vibrated. I'm sure it could have been resolved but I liked the idea of reducing the number of threaded connections to result in less potential for leaks.  We also changed the way the transducer was mounted to the engine mount. IMO, JPI should offer a T fitting (or at least a P/N) with two male connections for the hoses and one female connection for the transducer.  

[Guest]

17 hours ago, Martin S. said:

That looks pretty nice. Already saw this in another post of yours. The EDM830 transducers are secondary. As such, this configuration requires three dedicated (additional) hoses from the respective original lines to the "tripple board". I´m hestitating between this setup and one where the EDM830 sensors are directly connected to Tees, without intermediate hoses.

Be sure to mount the transducer on a section of hose, hard mounting directly to the engine shortens their life. Aircraft Spruce also has some mounting options available.

[Martin S.]

Thanks for your comments and fotos everyboy. Dcarlton, looks like your initial setup had a female tee with 2 male adapters to flare (for connection to the hoses). I believe the AN824 male tee (https://www.aircraftspruce.com/catalog/hapages/an824.php?clickkey=11741) allows skipping these adapters. Will try it this way and hook a hose from the tee to the EDM transducer, as suggested by @M20doc. Will share a picture when its finally done one day. 

Edited November 26, 2022 by Martin S.

[jetdriven]

You can’t connect the transducer to the an824 tee. It is a flare while the transducer is NPT 

[Martin S.]

3 hours ago, jetdriven said:

You can’t connect the transducer to the an824 tee. It is a flare while the transducer is NPT 

Oh true, thanks for pointing to it. Should have been more precise. I meant an824, followed by adapters, followed by transducers.

[jetdriven]

Then you still have three threaded connections. Just in different places.  They also don’t make an adapter with an AN flare female.  So you gotta put a hose section on it. Then a AN nipple to a NPT pipe coupler. 
 

ww had a plane in the shop the other day for a prebuy. It had a race car shop male-femal adapter on it and the OP sender screwed into the side of it. Now this was also a 45 degree car flare fitting so they just over torqued the hell out of it to get it to fit.  Now this was a swivel fitting so it could have snapped in two at any point. The JPI was installed a couple years ago. Passed a couple annuals at esteemed Mooney shops.  Anyways. 
 

 

 

ir also had this beauty …..ugly but functional  

[Martin S.]

1 hour ago, jetdriven said:

Then you still have three threaded connections. Just in different places.  They also don’t make an adapter with an AN flare female.  So you gotta put a hose section on it. Then a AN nipple to a NPT pipe coupler. 
 

ww had a plane in the shop the other day for a prebuy. It had a race car shop male-femal adapter on it and the OP sender screwed into the side of it. Now this was also a 45 degree car flare fitting so they just over torqued the hell out of it to get it to fit.  Now this was a swivel fitting so it could have snapped in two at any point. The JPI was installed a couple years ago. Passed a couple annuals at esteemed Mooney shops.  Anyways. 
 

 

 

ir also had this beauty …..ugly but functional  

True. Looks like there`s no way to reduce the number of adapters then.

[DCarlton]

5 hours ago, Martin S. said:

True. Looks like there`s no way to reduce the number of adapters then.

You guys made my point.  It's a shame the companies selling the transducers don't offer a viable elegant alternative or an alternative manufactured to an AN spec.  It's a common installation challenge.  They won't even make a recommendation if you contact tech support.  

There needs to be something in the configuration below made to a spec the aviation community is comfortable using (I believe the fitting below is actually made to an SAE spec even though it's an AN fitting).  I'm not expert though; not an A&P.  

https://www.summitracing.com/parts/AER-FBM2881

[carusoam]

Interesting FF sensor location on that one, Byron!

A full 360° to get everything to sorta fit…

+1 if it is functional…. (Curves, and fittings, in and out of the FF sensor can be challenging to data quality)

-1 if hot starts are a challenge…  (fuel likes to evaporate in the elevated temps found above the cylinders…)

+1 for copying an example that you know works….

-1 Having duplicate instruments increases the uniqueness of the installation….

+1 for mounting all sensors on the firewall when able… (sensor life improves when not heated and shaken)

LBs mount the FF sensor on the firewall as well….

 

PP thoughts only, not a mechanic…

Best regards,

-a-