Which EDM CHT probe?

[tankertoad]

Ordered a new bayonet probe for my EDM 800 because the #4 died, and assumed the factory was on #3. Open my cowl to find it on #4. Im pretty sure I need the gasket style from JPI, but there are two listed on Spruce (M-113, M-113-3/8)...anyone know which one I need? (IO-360 A1A) - TT

[tankertoad]

Also - the M-113 come in either 14mm or 18mm diameter. 

[carusoam]

Typically there are two common sizes...

The larger one, fits under a spark plug... (less appreciated 50°f variation)

The smaller one, fits under the bayonet TC holder... (better location, still a 25°F variation)

Check to See if that is what you have to decide from...

Also...  Some Mooney ship’s gauge CHT sensors are thermistors and not TCs (thermo couples).

PP thoughts only, not a mechanic.

Best regards,

-a-

[tankertoad]

Thanks ! Fortunately, my factory is working, just need the one going to the JPI. I think the 14mm size is the best guess (18mm under spark plug, 3/8 for Tanis) for what will fit under the factory TC. Cheers!

[Guest]

35 minutes ago, tankertoad said:

Thanks ! Fortunately, my factory is working, just need the one going to the JPI. I think the 14mm size is the best guess (18mm under spark plug, 3/8 for Tanis) for what will fit under the factory TC. Cheers!

The M113-3/8 should be the one for installation under the OEM probe.  The thread size is a 3/8”-24.

Clarence

[tankertoad]

On 9/2/2019 at 6:21 PM, M20Doc said:

The M113-3/8 should be the one for installation under the OEM probe.  The thread size is a 3/8”-24.

Clarence

Spot-on  -- Thanks!