Are you ready for winter? Is your plane? AVweb recently published a primer on the importance of preparing your plane for winter. It’s complete with detailed instructions for Lycoming and Continental engines. Check it out here.
Q: I lost the left mag on my O-540. When I took it apart, I found four aluminum specks in the top oil screen. I pulled the rear housing off and found the aluminum gear still in the engine. I sent it off for repairs to Tulsa, where they installed a new oil pump, shaft, gears and housing, as well as a new fuel pump and dry vaccum, and two rebuilt mags. I ran it for 1.5 hours, then pulled the screen and found a few specks again, but not as many as the first. Any ideas?
In the past few months, my friend Paul McBride has written several very interesting and informative articles on “breaking in” an aircraft engine, including “How to break-in your engine”. I recommend that you read them when or if you have a new or rebuilt engine to install on your aircraft. [Read more...]
Q: My partner, Lou, and I just had our Piper PA 28 235 overhauled and are having problems with the lower plugs getting oil fouled. The plugs have been cleaned a couple of times but she runs rough and they foul again. The mechanics are talking about putting a thin wire plug in. My concern is that we could have a leak in the valve stem seal, rings, or head or valve cover gaskets. The cylinders were rechromed and we had new rings, the valves machined, etc. One shop did the machining and cylinders, another shop assembled everything.
Where should we start?
TOM CAMP, via email
I recently received a letter asking about engine break-in following overhaul. This is a subject that should be of interest to everyone, even though you may never actually have the opportunity to break-in an engine during your flying years.
Q: I have a Glasair with a Lycoming IO-360-B1E engine. After reading your article in the May 11 issue, I tried to get a copy of Lycoming’s SI1325A to see if I should change the timing from 25 to 20 degrees BTDC, but was not able to find that instruction. Can you help?
RON WALTERS, via email
Lycoming Engines will release Service Instruction SI-1070S in the fall, which will add 20 engines to the list of models approved for use on UL 91 unleaded avgas and bringing the total number approved to 55. With the move, Lycoming officials continue to call for UL100 as a fleetwide solution to replacing 100LL.
Zenith Aircraft Co. will host its first-ever “Engine Day” next Thursday, July 26, at the company’s exhibit at AirVenture in Oshkosh. The company will have a number of Zenith aircraft with different powerplants on display, as well as representatives from a number of engine manufacturers.
Q: I have a factory reman Lycoming O-540 E4B5 with 300 hours and 2.5 years on it. At idle (1,000 rpm), my JPI is showing alarms on the #1 EGT for having a large differential — #1 EGT is only 600° while the rest are 1,200-1,300°. Above 1,500 rpm and higher everything seems fine with normal readings and maybe #1 CHT a little lower, but I expect that since it is first in the airstream. I have full data printouts from the JPI.
I have checked the plugs even though my mag checks are fine and replaced the probe on #1 EGT with no change. I’m scared to think I have stuck valves. [Read more...]