EDM 700 Installation

[Tommy]

Hi guys!

 

I am about to embark on the task of putting in an EDM 700 with 4 CHT and 4 EGT and 1 oil temp probes with my AME.

 

Hoping to keep myself informed of the process, has anyone done this in the past with their M20J?

 

Just wondering what are the steps involved and any tips will be highly appreciated!!

 

Thanks

[N601RX]

It isn't that difficult, just follow the manual.  I've installed a 830 and 900. Get a pair of good quality crimpers for the wires.  Pliers or cheap ones will cause problems later on. I also did something a little different that what I've saw others do. A lot of people bundle the egt and cht wires down under the cylinders, where they are subjected to a lot of oil and heat that takes its toll on them over time.  I routed mine up high around the top of the baffling and after 3 years they still look like new.  Also be aware that the power ground goes directly to the engine, and not to the airframe. Here is a picture of how I routed them.

[RobertGary1]

Its pretty straight forward. Make sure you buy the CHT bayonet and don't use the useless spark plug ring included when augmenting the cylinder with the factory sensor (#1 or #4, I don't recall which ). The plug for the oil temp is not easy to get out but will budge with some pulling and cursing. You want the plug on the front of the case behind the prop on the pax side. Aside from that you just need to be very careful of how you route your wiring. Use lots of Adeles, etc and don't let wiring touch the exhaust stack. Its a simple install that an owner can easily do himself with an A&P sign off later. Also be sure that you precisely measure the location of your EGT install and use the exact same distance down the stack on all 4. The temps drop very quickly as the exhaust moves down the stack and you'll lose the benefit of your EDM comparing temps if you install the EGT's differently.

 

It may be so easy an AME can do it but its best they stick with their profession of medicine and leave the mechanical work to others.

 

-Robert

[bjoseph604]

Can anyone tell me what the differences are between the EDM900 and the EDM930? I currently have an EDM700 in my ship with separate fuel flow and fuel indicating guages and I'm thinking of upgrading all 3 into a single unit.

[Bob_Belville]

There was an exchange on another thread last week on the 900 vs. the 930. Either on can be primary, the display is larger on the 930. This is a 930, the RAD is above the Aspen.

 

You can compare here:

www.jpinstruments.com/shop/

[Marauder]

Can anyone tell me what the differences are between the EDM900 and the EDM930? I currently have an EDM700 in my ship with separate fuel flow and fuel indicating guages and I'm thinking of upgrading all 3 into a single unit.

900 and 930 are approved to replace primary instruments in your plane (means you can remove them). The 900 is the same size as the 830 and fits in the 3" panel hole but has a rectangular shape. The 930 is a much larger unit. Check out Bob Belville's gallery. It has the 930.

This is a picture of my 830, which is the same size as the 900.

[N601RX]

The features are very similar, they share the install manual and poh. The main differences are size of display, cost and the 900 uses a red/yellow remote led while the 930 uses a segmented display that will show RPM and other alarms.

[bjoseph604]

Awesome. Thanks for the info guys. Sorry if I hijacked the original thread!

[carusoam]

The price of hijacking a thread...

Pictures of your installation become mandatory.

Translation for Tommy: AME is the Dr we have to visit for flight physicals in the US. A&E or A&P is the Dr. That the Mooney visits? Good luck with the installation.

Best regards,

-a-

[Tommy]

Thanks guys!

 

In Australia, the engineers are called LAME ("len-mee") while the docs are called DAME ("dan-mee"). 

 

Isn't a wonder that Australian GA is on life support...?

 

[Tommy]

So what would be the most logical steps? 

[BigTex]

So what would be the most logical steps?

contact your A&P and have it installed.

[PTK]

Hi guys!

 

I am about to embark on the task of putting in an EDM 700 with 4 CHT and 4 EGT and 1 oil temp probes with my AME.

 

Hoping to keep myself informed of the process, has anyone done this in the past with their M20J?

 

Just wondering what are the steps involved and any tips will be highly appreciated!!

 

Thanks

http://mooneyspace.com/topic/13511-engine-fuel-flow-monitor-recommendation/?p=174522

[Tommy]

Any one has got photos of the CHT probes and EGT probes and harness / wiring?

 

Wehre do you guys secure your harness and wiring to?

 

A picture is worth a thousand words, they say!

 

Thanks

[Bob_Belville]

This is for a 930 but it would be the same. The EGT probes are installed in the exhaust headers, 6" below the flange. The CHT use the plug beside the lower plug.

[N601RX]

I attached mine to the top of the baffling as shown in the picture several post above.  This keeps them out from under the cylinders where it is hot and sometimes oily. After 3 years they are still nice and clean.

[Awqward]

In Australia

LAME = Licensed Aircraft Maintenance Engineer

DAME = Designated Aviation Medical Examiner

For Tommy

A&P = Airframe & Powerplant (mechanic)

[RobertGary1]

I routed all mine below the cylinders. Used lots of adels and ensure they stay away from the exhaust stack. Almost 10 years now and no damage yet. The only one run on the top is the oil temp since it needs to run to the front of the engine.

 

Again, make sure to get the bayonet for the factory CHT probe rather than using the lame spark plug ring.

 

-Robert

[DonMuncy]

Again, make sure to get the bayonet for the factory CHT probe rather than using the lame spark plug ring.

 

-Robert

This may depend on whether your GEM is a legal replacement. On my K model, with my earlier JPI, it is not a primary instrument, so I have to keep the factory CHT. The factory gauge uses a thermister which has to go in the bayonet hole. So I am stuck with the spark plug ring for the #5 CHT. You just have to learn that the #5 is going to read a little different, and take that into account when checking CHTs.

[RobertGary1]

This may depend on whether your GEM is a legal replacement. On my K model, with my earlier JPI, it is not a primary instrument, so I have to keep the factory CHT. The factory gauge uses a thermister which has to go in the bayonet hole. So I am stuck with the spark plug ring for the #5 CHT. You just have to learn that the #5 is going to read a little different, and take that into account when checking CHTs.

 

You don't have to use the spark plug ring. JPI makes a CHT probe that has a hole in the back to thread the factory sensor. So two sensors in one hole.

 

-Robert

[DonMuncy]

You don't have to use the spark plug ring. JPI makes a CHT probe that has a hole in the back to thread the factory sensor. So two sensors in one hole.

 

-Robert

Robert,

I was not aware of those. Have you seen one. Do you wind up with two probes inserted into the head, or does the Gem probe "read" the temperature on the lower surface of the head. Is there a noticeable difference between the temperature up inside that hole and out on the outer surface.

[RobertGary1]

Robert,

I was not aware of those. Have you seen one. Do you wind up with two probes inserted into the head, or does the Gem probe "read" the temperature on the lower surface of the head. Is there a noticeable difference between the temperature up inside that hole and out on the outer surface.

 

There may be a slight difference when the factory probe is placed inside the JPI bayonet but the factory gauge isn't accurate enough to quantify it. However, on the EDM the temp across all cylinders will be consistent. Using the plug ring you expect to have a 25F difference. EDM ships with the ring and you can purchase the bayonet as an upgrade. 

 

-Robert

[DonMuncy]

Robert,

I have checked the JPI site and can't find a picture of this probe. Am I just missing it.

Thanks

[RobertGary1]

Robert,

I have checked the JPI site and can't find a picture of this probe. Am I just missing it.

Thanks

 

I think its there, listed as the bayonet CHT probe but the picture is unfortunate in that the wire is laid to appear that its coming from the top. If I make it out to the airport this weekend to work on my vac system I'll snap a pick.

 

-Robert

[N601RX]

It looks just like and mounts like the spark plug ring but is the diameter of the bayonet probe.