Greg@williamslawoffice.us

I recently had the same problem with my M20K/262. We traced the oil leak to the vacuum pump and replaced the garlock seal behind it. However, that did not resolve the problem. Apparently there is a T-drive adapter which attaches to the engine accessory case and drives the vacuum pump. On my plane it also has a second alternator bolted to it which is belt driven. There as a blank plate on the T-drive adapter which has a second garlock seal inside of it. That seal had failed, allowing oil to cumulate inside the blank plate during flight, and on shutdown that oil then would migrate along the drive adapter for the vacuum pump and out of the engine. It also dripped directly onto the automatic waste gate which made it look like that was the site of the leak. So, it was a $10 seal to replace, just a few AMU's to find the problem.

There is a little more to the history of the 262 conversion. The actual mechanic on the STC is Robert (Bob) Meier, who was the original owner of Mod Works, and he still owns the STC for the 262 Conversion. Mooney Mart just subbed out the engine and other installation work to Bob when he was based at Wimauma, FL. Bob is now one of the owners at Mooney Mod Works at Sarasota(SRQ). He still offers the 262 conversion there. Whether it makes economic sense is a good question. I think most of the value in an older Mooney is the engine. The better the engine, the more value the airplane. The MB engine is a good package to operate.

Bob Meier at Mooney Mod Squad at Sarasota (SRQ) holds the STC for the 262 conversion. Not associated with MooneyMart/Coy Jacob.