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Phil |
February 28, 2020, 4:15am |
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Ace
Posts: 1,071
Time Online: 15 days 4 hours 23 minutes
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Hi, I'm halfway breaking-in the R277. Unfortunate happened when CHT has stopped working. And obliged to abort the break-in program. I really dont know how to check or troubleshoot this thing. Do you guys has something to suggest or advised? Thanks in advanced.
Phil
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Mickvds |
February 28, 2020, 11:51am |
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Wing Man
Posts: 71
Time Online: 2 days 47 minutes
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Hi Phil.
I take it the gauge worked for a while before it failed?
With a multi meter you can check for continuity across the 2 pins for the CHT. When checking you should get a reading of a couple of Ohms and you should also see the needle of the gauge move slightly. If the gauge doesn't move swap the probes around and try again. If the gauge moves than it should be ok so then check the connection of the wiring to the engine.
Hope this helps.
Cheers, Mick |
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radfordc |
February 28, 2020, 3:43pm |
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Ace
Posts: 1,836
Time Online: 18 days 1 hours
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I'm guessing a broken wire due to vibration of the engine. Look at the wires where they join together at the ring terminal. |
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Phil |
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Ace
Posts: 1,071
Time Online: 15 days 4 hours 23 minutes
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Thanks, Mick! I tested pins accordingly and found gauge ok. Tracing for continuity a broken wire near ring identified..as Radfordc nailed it! Now, I'm thinking of lead soldering to reconnect since wires were crimp to the ring. This advisable? Regards, Phil
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Arthur Withy |
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Happy 1500R owner - building a Jodel D18 Ace
Posts: 2,532
Time Online: 32 days 12 hours 14 minutes
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Hi Phil...try for the repair ...however once they fail..I find replacement is better...which cost $$$$ so take care of them from the start.
This is my experience..sorry for the bad news
My experience is to treat them very gentle. They seem fragile.
Good luck ..its good to see you making progress.
Regards Arthur |
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Arthur Withy |
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Happy 1500R owner - building a Jodel D18 Ace
Posts: 2,532
Time Online: 32 days 12 hours 14 minutes
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Ohh Ive replaced 3 on my aircraft..just info for you |
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radfordc |
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Ace
Posts: 1,836
Time Online: 18 days 1 hours
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A soldered repair won't work. If you can open the crimp on the ring you can cut off the broken wire and recrimp the ring. Be sure the two wires are touching inside the crimp. I've found that replacement works best. |
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joe.scalet |
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Flight Leader
Posts: 155
Time Online: 2 days 1 hours 58 minutes
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If you have a small hi temp torch you can melt the two wires together forming a small bead. Then any crimp connector will do. |
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Valy |
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Fledgling Member
Posts: 12
Time Online: 1 days 2 hours 9 minutes
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The wires connection in the round connector is a thermocouple. Any soldering there or on the wires will change its properties and therefore the gauge reading. Unfortunately, the only solution is to replace the wire with the thermocouple. |
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Phil |
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Ace
Posts: 1,071
Time Online: 15 days 4 hours 23 minutes
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I opened the crimped ring with oxyacetelene torch to removed wire and recrimped the pair wire before lead soldering the wire tips. Considering a temporary set-up while waiting for new probe to arrived then it could be compared readings between repaired probe with new one. Just finished or able to complete the engine break-in with satisfactory results. CHT has shown the maximum temp of 410 F and 900 F on EGT.
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Mickvds |
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Wing Man
Posts: 71
Time Online: 2 days 47 minutes
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Good to hear you found the issue.
Cheers, Mick |
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radfordc |
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Ace
Posts: 1,836
Time Online: 18 days 1 hours
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An easy way to check the calibration on a CHT probe is to put it in boiling water. Temp should read very close to 100C (212F). |
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joe.scalet |
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Flight Leader
Posts: 155
Time Online: 2 days 1 hours 58 minutes
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Stilson |
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Flight Leader
Posts: 136
Time Online: 1 days 5 hours 36 minutes
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Sorry, I have to go off topic, great dash. I've done it in the past (and if you did it the same way double 👍)but I think it would be neat if somebody with more experience/communication skills posted a how too on machine turning. Yours looks great |
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