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General control line discussion => Open Forum => Topic started by: Robert Zambelli on December 01, 2016, 08:09:50 AM
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The exhaust system on my Cessna 120 requires inspection every 25 hours, according to a placard on the dashboard.
I inspect it every 15 hours.
This last time, I did the inspection after 13 hours and got quite a shock! ~^ ~^
The port side muffler was blown out as seen in the picture. When I inspected it 13 hours ago, there was not a single hole or crack. If fact, I tap it with a screwdriver handle to check for soft spots.
This is the side that is attached to cabin heat, which fortunately I have not used recently.
Bob Z.
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Fortunate catch. Time to buy one of those muffler patch kits from Walmart?
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Don't you have a monoxide detector in the cockpit?
MM
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Wow, that IS scary. Is there a modern stainless replacement maybe? I had a similar but not nearly as bad situation with the muffler on the A65 in my T-Craft, requiring frequent inspection and some repairs. This seems like something there should be (or maybe is) an AD on, in addition to placarded warnings.
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Shows you just how hot those babies run! Good catch.
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Hey Z-man....
A friend from NJ was prototyping a stainless 4 into 1 on his Cessna....allegedly a power increase and a weight reduction....it sounded pretty cool, too. Any progress in that area?
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Don't you have a monoxide detector in the cockpit?
MM
Yes, I have carbon monoxide detectors in both of my aircraft.
Since the cabin heat has not been on in a long time and the fresh air vents were open, I never got an indication.
When the cabin heat in the Cessna is closed, it seals very tight and nothing comes in the cabin.
Bob Z.
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thats the heat box tho / , not a muffler . Is It . So youd loose the warm air in - out through the ole . :-\
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Hi, Matt.
No, that is the muffler. I removed the heat boxes to do the inspection.
That's when I found the deteriorated mufflers - inside the heat boxes.
Bob Z.
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Count your blessing,that could have been ugly. Great catch........PhillySkip
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Just finished installing the new system.
Upgraded by STC, fits perfectly.
Bob Z.
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Looks nice! And what's baby blue in the background? Is that Daphne blue?
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Looks nice! And what's baby blue in the background? Is that Daphne blue?
That's my baby blue 1974 FIAT Spider - one of the most reliable and fun to drive cars I've ever owned! I've had it since 1976.
Bob Z.
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'Z' man is very 'car-anointed'.
Glad you found that 'heat annoyance' in time, Robert!
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Me too, Bob, I'm sure glad you do such timely inspections. Was it the original muffler, or is that a part that needs periodic replacement?
Damn glad you're still with us.
Rusty
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Those new mufflers look more better, Bob!
Chris...
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Me too, Bob, I'm sure glad you do such timely inspections. Was it the original muffler, or is that a part that needs periodic replacement?
Damn glad you're still with us.
Rusty
Hi, Rusty - yes, as far as I know, the mufflers were original, from 1946. I could not find anything in the log books alluding to replacement.
The one in the photo was on the port side of the plane.
When I removed/inspected the one on the starboard side, I found several places where it had been welded - more than likely to repair cracks.
Anyhow, the new mufflers will outlast me!
Bob Z.