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Bad News re. our 1994 IO 550 with Gami Injectors

Uhg! Just received the following email from our trusted repair shop here in NY.

"Cylinders #2 & #4 have a ring step at the top end of the cylinder wall when the piston is at its top of its travel and although the compression test showed 63 lbs, the pressure dropped 25 lbs when the piston was moved slightly, Then you could hear the pressure loss coming through the crankcase.
Cylinder #6 failed the test with a reading of 36 lbs leaking mostly past the exhaust valve. I recommend removing all three cylinders for evaluation & repair.
We are also going to have send the magnetos in for overhaul due to the amount of time on them since last overhaul, as well as per an "AD"."

We still have about 375 or 3 years before TBO.

Any insights or guidance would be very much appreciated.

Thanks in advance.

Model: Bonanza F33C
Posted 12/17/2019 - 2 years ago
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Just ordered a RAM Engine as a result of above.

Posted 12/19/2019 - 2 years ago
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Hi Jon,
I have an F33A 1992 with one cylinder below 40, so I'm interested in the testing you've done.

Was there any issue or roughness at runup or during flight?

Continental's direction is that even lower compressions are OK as long as rated power is made. I get rated power and a smooth running engine especially at flight RPMs. Wondering what else I should keep an eye on beside valve air leaks.

Posted 12/19/2019 - 2 years ago
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When that happened to me, I installed six new Millinniums.

Why?

The rest of the engine looked great. The cam was excellent. The case had no cracks or leaks. I then flew the engine another thousand hours without problems.

Tom

Posted 12/20/2019 - 2 years ago
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You were in a better spot then we were Tom. In response to your and Ghazon's (earlier) posts, we pulled the other cylinders, and noticed rust and pitting on the cam and case. It's a 24 year old motor, which BTW ran great. We've always changed the oil around 25 hours and sent it out for analysis each time with a good report.

We've flown the plane almost 170 hrs a year for the past 3 years we've owned it, but understand it sat with the prior owner for a few years.

In any event, looking forward to the new RAM motor being installed, and hopefully many more enjoyable hours flying around the Northeast and beyond (on a rare occasion).

Posted 12/20/2019 - 2 years ago
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In reply to: Jon Gordon | 12/20/2019 - 2 years ago

You were in a better spot then we were Tom. In response to your and Ghazon's (earlier) posts, we pulled the other cylinders, and noticed rust and pitting on the cam and case. It's a 24 year old motor, which BTW ran great. We've always changed the oil around 25 hours and sent it out for analysis each time with a good report.

We've flown the plane almost 170 hrs a year for the past 3 years we've owned it, but understand it sat with the prior owner for a few years.

In any event, looking forward to the new RAM motor being installed, and hopefully many more enjoyable hours flying around the Northeast and beyond (on a rare occasion).

Just curious, what area of the country was the airplane kept in?

Posted 12/20/2019 - 2 years ago
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Jon,

I am based in Wisconsin. I do fly all over the country, but the majority of the time, my Bonanza is in a hanger in Wisconsin.

Tom

Posted 12/21/2019 - 2 years ago
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I am in upstate NY and this happened to me last year. I bought the plane and it was stored outdoors in BC, owner lost medical so sat for almost a year. I got three years out of the engine before cylinder went bad, inspected the rest, the pitting became too much. It had about 1200 hrs on it so bit the bullet and purchase new one from RAM.

Posted 1/2/2020 - 2 years ago
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RAM IO 550 Installed by Swift Aviation at 44n runs great! So glad we followed Walter's advice and put in the new RAM Engine. Runs almost as smooth as a Turbine.. .Almost.

Posted 7/24/2020 - 1 year ago
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Bad News re. our 1994 IO 550 with Gami Injectors