Anyone have a spare CHT probe from an upgrade floating around?

bmcconnaha · January 28, 2021

Looking for a 880010-503. Lasar calls it a “universal CHT probe”. Plane is down for an engine upgrade, and my CHT probe had just failed. I have a JPI830, so I wasn’t too concerned, but it’s not a primary replacement, so my factory CHT really should work. The STC for the upgrade calls for remarking the factory gauge, and I know my IA is going to want it to work. The green will now start at 300F. Someone have one they would part with for a reasonable fee? No sense in buying a new one, I’ll be going with a dynon skyview HDX as soon as it’s approved for the autopilot, and I plan to do the engine monitor with the dynon.

thanks,

Bryan

**carusoam** · January 28, 2021

Bryan,

Something isn’t quite right...

Why are you changing the ship’s gauge?

These things are old standards, and are on the MEL...

You had a TC failure, get the TC replaced... they typically use a K type thermocouple... (TC)

A few Mooneys have used thermistors for the ship’s CHT gauge, similar to OilT... (I don’t recall the detail of which ships got the lucky thermistor treatment...)

So... if you are the lucky owner of a ship using a thermistor in place of a thermocouple... matching the gauge with the sensor is going to be important...

It will most likely take more than remarking the factory gauge...

You can see... i can’t tell what you are missing... just a heads up of what I think I am seeing... something doesn’t sound quite right...

Either way... @Alan Fox probably has what you need...

Best regards,

-a-

**N201MKTurbo** · January 28, 2021

https://www.aircraftspruce.com/catalog/inpages/rochcht.php?clickkey=3560

bmcconnaha · January 28, 2021

That probe in my post is definitely the right probe. It got broken somehow. I suspect the a&p that fixed the faulty JPI gasket probe over tightened the little nut on the top. I am not changing the gauge, just making sure the OEM CHT gauge works is all. Lycomings STC will require it to be remarked. I haven’t got that far yet. I’m hoping just a placard saying the new limits will suffice. Attached is a photo from the install manual for your reading pleasure.

**carusoam** · January 28, 2021

The probe Rich is showing is the Thermistor type... for 0.15 amu...

The typical K type CHT sensor is about 0.1 amu... more cost friendly....

So... it looks like you are modernizing the instrument display, unrelated to the failed sensor...

Make sure you are getting the right type of sensor...

PP thoughts only, not a mechanic...

+1 on Rich’s recommendation... he is a real mechanic... and probably has pics of the actual probe That just came off his engine...

Best regards,

-a-

bmcconnaha · January 28, 2021

Just now, carusoam said:

The probe Rich is showing is the Thermistor type... for 0.4 amu...

The typical K type CHT sensor is about 0.1 amu... much more cost friendly....

So... it looks like you are modernizing the instrument display, unrelated to the failed sensor...

Make sure you are getting the right type...

Best regards,

-a-

Not yet. The dynon will be down the road once the autopilot is released. And that will be a primary replacement at that time. All of the old gauges will be removed at that time. For now just going to get by with the OEM CHT gauge and my JPI830. I have an engine install to finish, and and engine to break in before I worry about more avionics. That’s a next winter plan.

**N201MKTurbo** · January 28, 2021

Just now, bmcconnaha said:

Not yet. The dynon will be down the road once the autopilot is released. And that will be a primary replacement at that time. All of the old gauges will be removed at that time. For now just going to get by with the OEM CHT gauge and my JPI830. I have an engine install to finish, and and engine to break in before I worry about more avionics. That’s a next winter plan.

I have a used one I’ll let you have for $50 plus shipping.

bmcconnaha · January 28, 2021

Just now, N201MKTurbo said:

I have a used one I’ll let you have for $50 plus shipping.

That should work. I’ll go grab the probe tomorrow and confirm. I’ll send you a PM tomorrow night

**N201MKTurbo** · January 30, 2021

On 1/27/2021 at 9:48 PM, bmcconnaha said:

That should work. I’ll go grab the probe tomorrow and confirm. I’ll send you a PM tomorrow night

I just tested it. 50k ohms at room temp, 15k ohms after heating it with a lighter. Seems to work.

bmcconnaha · February 5, 2021

On 1/29/2021 at 4:10 PM, N201MKTurbo said:

I just tested it. 50k ohms at room temp, 15k ohms after heating it with a lighter. Seems to work.

could you tell me what the rest of the numbers are? I need 3080-38 Q K11

mine appears to be in really good shape, but the center spins, I don't think it should

**N201MKTurbo** · February 5, 2021

1 hour ago, bmcconnaha said:

could you tell me what the rest of the numbers are? I need 3080-38 Q K11

mine appears to be in really good shape, but the center spins, I don't think it should

I'll look at it tonight, it is at the house. It is the right sensor. Just test it with ohmmeter. If you get numbers similar to what I stated above, it is OK. They are not likely to be off, they either work or not.

bmcconnaha · February 21, 2021

On 2/5/2021 at 9:25 AM, N201MKTurbo said:

I'll look at it tonight, it is at the house. It is the right sensor. Just test it with ohmmeter. If you get numbers similar to what I stated above, it is OK. They are not likely to be off, they either work or not.

did you ever check the numbers on that probe? i do need it

**N201MKTurbo** · February 21, 2021

1 hour ago, bmcconnaha said:

did you ever check the numbers on that probe? i do need it

I never heard from you, I took it back to the airport. It is the correct probe.

bmcconnaha · February 21, 2021

On 1/29/2021 at 4:10 PM, N201MKTurbo said:

I just tested it. 50k ohms at room temp, 15k ohms after heating it with a lighter. Seems to work.

Just now, N201MKTurbo said:

I never heard from you, I took it back to the airport. It is the correct probe.

sorry, i misunderstood. I'm not in a wicked rush, my engine isn't here yet. Will you be back out there any time soon?

**N201MKTurbo** · February 22, 2021

Yea, I’m out there almost every day doing the endless engine overhaul.

bmcconnaha · February 22, 2021

Just now, N201MKTurbo said:

Yea, I’m out there almost every day doing the endless engine overhaul.

I’m doing the exact same thing at the moment. Feels never ending. Lycoming has missed their projected completion date already. Moved out another week or two. No big deal since they already have my money, lol.
let me know how you want me to pay you. Venmo or PayPal is fine

**N201MKTurbo** · February 22, 2021

3 minutes ago, bmcconnaha said:

I’m doing the exact same thing at the moment. Feels never ending. Lycoming has missed their projected completion date already. Moved out another week or two. No big deal since they already have my money, lol.
let me know how you want me to pay you. Venmo or PayPal is fine

Spent today fitting my new Airforms engine baffeling. It is impossible to install the left rear one without scratching the paint, now I have paint touch ups to do. I overhauled the engine myself, still cost 20K.

OR75 · February 22, 2021

On 2/5/2021 at 8:17 AM, bmcconnaha said:

could you tell me what the rest of the numbers are? I need 3080-38 Q K11

mine appears to be in really good shape, but the center spins, I don't think it should

The center on that CHT probe does spin.

Probably not a good idea to use a locking nut with a rubber insert. It is a relatively high temp area.

It should be a tiny regular nut with a spring washer

bmcconnaha · February 22, 2021

Just now, N201MKTurbo said:

Spent today fitting my new Airforms engine baffeling. It is impossible to install the left rear one without scratching the paint, now I have paint touch ups to do. I overhauled the engine myself, still cost 20K.

Good to know. I have new air form baffles as well that are powder coated, and look pretty. I’m hoping to keep them that way.

**N201MKTurbo** · February 22, 2021

Just now, bmcconnaha said:

Good to know. I have new air form baffles as well that are powder coated, and look pretty. I’m hoping to keep them that way.

Good luck, mine needed adjustment. If you are careful, you can trim them and just have shiny edges.

**N201MKTurbo** · February 27, 2021

On 2/21/2021 at 8:22 PM, bmcconnaha said:

I’m doing the exact same thing at the moment. Feels never ending. Lycoming has missed their projected completion date already. Moved out another week or two. No big deal since they already have my money, lol.
let me know how you want me to pay you. Venmo or PayPal is fine

PM me your address and I will send the probe.

**N201MKTurbo** · February 27, 2021

On 2/21/2021 at 8:31 PM, OR75 said:

The center on that CHT probe does spin.

Probably not a good idea to use a locking nut with a rubber insert. It is a relatively high temp area.

It should be a tiny regular nut with a spring washer

I just put that nut on there to keep the other nut from coming off. It is only finger tight. I know it won't work.

bmcconnaha · February 28, 2021

5 hours ago, N201MKTurbo said:

I just put that nut on there to keep the other nut from coming off. It is only finger tight. I know it won't work.

sending you a PM. thank you

bmcconnaha · March 5, 2021

On 2/27/2021 at 1:26 PM, N201MKTurbo said:

I just put that nut on there to keep the other nut from coming off. It is only finger tight. I know it won't work.

did my message come through ok?

**N201MKTurbo** · March 5, 2021

20 minutes ago, bmcconnaha said:

did my message come through ok?

You should be getting it some time soon.

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Anyone have a spare CHT probe from an upgrade floating around?

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