CHT Washer probes

[triple8s]

I have an IO 550 with a Tanis heater and JPI 730. Ths tanis has cylinder heaters that occupy the place that the bayonets would normally be for the CHT probes, so it has the Spark plug washer probes on all cylinders. The problem is when the plugs are removed and reinstalled it seems one of the probes gets damaged. The plugs and washers go down into a recess and the socket always gets one of them. Is there not a probe/heater that can be used to negate having to use the washer style probes?

[Marauder]

I have an IO 550 with a Tanis heater and JPI 730. Ths tanis has cylinder heaters that occupy the place that the bayonets would normally be for the CHT probes, so it has the Spark plug washer probes on all cylinders. The problem is when the plugs are removed and reinstalled it seems one of the probes gets damaged. The plugs and washers go down into a recess and the socket always gets one of them. Is there not a probe/heater that can be used to negate having to use the washer style probes?

Here is what you need.

http://www.aircraftspruce.com/catalog/inpages/chtTanisProbe1.php?clickkey=13037

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[bradp]

Do they no longer sell the probe that the bayonet inserts through? I found that the washer ring reads higher than all my other CHTs and when I installed the bayonet insert everything was in line.

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[Browncbr1]

Mike, jpi sells collar proves that fit on the tanis probes and factory cht probe.  Same way as the spark plug probes, but smaller diameter collars.   It is what they shipped me with my 830, as I also have tanis probes.  I have read that they will indicate lower temperatures than bayonet cht probes and much lower than spark plug collar probes.  

Edited October 29, 2015 by Browncbr1

[jclemens]

I would ditch the Tanis heat and get the bayonet probes.  The spark plug gasket probes are always breaking, the CHT gasket ones are super sensitive to airflow giving you incorrect readings.  The 520 in my Bonanza has one on the #1 cylinder where the factory CHT is and it is pretty much useless, reads 40-50 degrees lower than the rest in cruise and then reads higher than the rest after landing.  

[kortopates]

The best solution if you want to keep your Tanis heater elements is to buy the combination Heater element with Thermocouple probe directly from Tanis. Available here http://www.tanisaircraft.com/ttp2632-k-115-50.html If you are not in a hurry you could probably save some $ by having aircraftspruce special order them discounted for you. Then you'll have accurate temperature sensing and retain your heater elements. If you  go this route be aware that new Tannis heater elements require you to update the Tannis harness with Deutsch connectors - not hard to do but you'll need a new female plug for the harness too.

Incidentally, I had always thought the adapter on the bayonet was also accurate (as suggested by Maurauder above) - I had not heard of them being sensitive to airflow and I see a lot of aircraft data.

[jclemens]

The CHT adapter that goes on the bayonet comes with a piece of orange fire sleeve that most people assume goes over the wire connections.  It is supposed to be slid over the whole probe assembly and secured with traps to keep airflow off the probe.  the sleeve doesn't like to stay put, it ends up sliding up the probe and exposing the JPI adapter.  It's better than no probe  JPI should have certified the system as a primary replacement, in most cases that would allow the factory probe to go away and let you use 6 (or 4) probes that are the same for the JPI.  

[Guest]

I have an IO 550 with a Tanis heater and JPI 730. Ths tanis has cylinder heaters that occupy the place that the bayonets would normally be for the CHT probes, so it has the Spark plug washer probes on all cylinders. The problem is when the plugs are removed and reinstalled it seems one of the probes gets damaged. The plugs and washers go down into a recess and the socket always gets one of them. Is there not a probe/heater that can be used to negate having to use the washer style probes?

Tanis makes a combination heating element and thermocouple Ina bayonet style. So no rings to deal with.

Clarence

[Houman]

I found Reiff heating is much Easier and no need to remove anything...