Ask Paul: Why is my engine oil creamy?

Posted on March 31st, 2014 by

Q: I am doing a 100-hour inspection on a Piper Aztec with TSIO 540 Lycomings using Shell 15/50 oil with 50 hours on the oil. They are both midtime engines on this photo plane. They fly six hours a day... Continue Reading →

Ask Paul: What’s causing vibration?

Posted on February 19th, 2014 by

Q: I recently installed a new three-blade propeller in my Comanche 250 with an O-540 engine. After the first flight I noticed a vibration when I decrease the rpm to 2400 or below, so I had the prop dynamically balanced.... Continue Reading →

Ask Paul: What’s the TBO on my engine?

Posted on January 9th, 2014 by

Q: I have obtained a 1978 Bellanca 7GCBC with a Lycoming 0-320-A2B engine manufactured in 1977. I am attempting to learn more about this engine, including why the log book contains an entry at the 1,200 hour mark showing the... Continue Reading →

Ask Paul: Fly more, get longer TBO?

Posted on December 10th, 2013 by

Q: I bought my first plane, a 1981 Cessna T182RG, in May 2012. I have been flying this plane frequently and have put over 300 hours on it in the last calendar year. I can tell you that in 2005... Continue Reading →

Ask Paul: What’s causing intermittent roughness?

Posted on October 16th, 2013 by

Q: I am an European-based A&P with a customer who is experiencing intermittent roughness and loss of rpm (200) typically close to the top of climb on a long climb out. The roughness goes away once it is throttled back,... Continue Reading →

What’s causing Mooney’s rough-running engine?

Posted on September 17th, 2013 by

Q: I bought an older Mooney with a Lycoming IO-360 with Bendix fuel servo. The engine starts to run rough once the last 1/2 inch of throttle is given. An induction leak cannot be located. Would a faulty sniffle valve... Continue Reading →

Does flight school’s 172 need new rings?

Posted on August 14th, 2013 by

This question was initially sent to our fuels and oil expert Ben Visser, who passed it on to our engines expert Paul McBride for further comment. Q: Our flight school has a Cessna 172N with an O-320 H2AD. The engine... Continue Reading →

Ask Paul: Upgrading to a wide deck engine

Posted on July 7th, 2013 by

Q: I read your article from the Oct .7, 2009, issue of General Aviation News on Wide Deck vs. Narrow Deck Lycomings with great interest. I am trying to figure out one detail that I think your article answers, but... Continue Reading →

Ask Paul: The Cherokee Rattle

Posted on June 5th, 2013 by

Q: I just bought a 1974 300-hp Cherokee Six. It has about 1,200 hours to run, has great oil pressure, good compressions, hardly uses oil, no metal in the filter, but during the run-up at 2,000 rpm, the engine makes... Continue Reading →

What are the best options for overhaul?

Posted on May 8th, 2013 by

Q: My question seeks your advice about an overhaul on our Lycoming O-320-H2AD. As background, we have a 1980 C172N that’s been owned since new. It’s always been hangared, never been a flying club or training airplane, is not used... Continue Reading →