More 182 Woes

As I've written in previous posts, the alternator belt on the 182 has been periodically coming off during various phases of flight and we have been seeing traces of metal in the oil filter after oil changes. First the belt issue; we've recently tried a few more attempts at getting the pulleys in perfect alignment by making an alignment tool as recommended by a tech person at TCM so now the two pulleys are nearly perfectly aligned. So with everything lined up, the engine was run with the cowling off and the observation is that the belt is bowing up and down at around 2300 RPM (see video below). So even if the pulleys are aligned, the belt will eventually jump since its not remaining taught. There appears to be a vibration coming from the engine or propeller and after making some queries of the Cessna Owners Assoc., some others have seen this problem when there were bad crankshaft weights. Another owner had some missing pins for the alternator bracket, but these pins were airframe specific and our particular model of 182 doesn't require the pins.

Issue number two is the metal particles showing up in the oil filter. The first thought is that the metal is a remnant from the last cylinder failure that we had. But after changing the oil every 10 hours for the last few times, that metal should have worked its way out of the engine.

The question on everyone's mind is: are the belt/vibration issues and the metal in the oil related? No one knows for sure, but we don't have confidence in the airplane anymore and have decided to pull the engine and send it to the engine shop to be torn down and inspected. The shop is going to do something called an "IRAN" inspection. This inspection isn't cheap, but they will be able to get to the bottom of why the engine is producing metal and let us know if the crankshaft or something else is causing the vibration.

The engine was pulled on Wednesday and the engine shop will pick up the engine next week. Keep your fingers crossed.