Mooney M20J oil analysis

[Grant_Waite]

See attached all 3 of my oil samples since ownership of the plane. Numbers were elevated in the first and down in the second, then up again in the third. Plane has just over 400 hours smoh that was done in 2019. In 2010 the engine was sent to lycoming because it had a burned intake valve on #3 and camshaft lobe spalling. They replaced the camshaft, tappets, cylinders with P/N: 05K21120, rings, bearings, hardware, and all perishable items. I did an initial borescope using the Savvy recommended pictures, after the first analysis. Everything looked normal, there was the slightest bit of pitting in the cylinders from sitting in Florida but not to worry about. I fly the plane a lot so it doesn’t sit more than a week. I try to change the oil every 35 hours. The most recent sample has iron up which with the other 2 metals could be a sign of exhaust valve wear. I’d like anyone’s insight if this is normal numbers for the engine or is this early signs of possible exhaust valve wear. Oil analysis 1:11:24.pdfOil analysis 3:3:24.pdfOil analysis 4:18:24.pdf

[NewMoon]

4 hours ago, Grant_Waite said:

See attached all 3 of my oil samples since ownership of the plane. Numbers were elevated in the first and down in the second, then up again in the third. Plane has just over 400 hours smoh that was done in 2019. In 2010 the engine was sent to lycoming because it had a burned intake valve on #3 and camshaft lobe spalling. They replaced the camshaft, tappets, cylinders with P/N: 05K21120, rings, bearings, hardware, and all perishable items. I did an initial borescope using the Savvy recommended pictures, after the first analysis. Everything looked normal, there was the slightest bit of pitting in the cylinders from sitting in Florida but not to worry about. I fly the plane a lot so it doesn’t sit more than a week. I try to change the oil every 35 hours. The most recent sample has iron up which with the other 2 metals could be a sign of exhaust valve wear. I’d like anyone’s insight if this is normal numbers for the engine or is this early signs of possible exhaust valve wear. Oil analysis 1:11:24.pdfOil analysis 3:3:24.pdfOil analysis 4:18:24.pdf

Grant, two suggestions.  1) Find the best guy for the IO-360 and pay a bit to have him weigh in. Not sure which shop specializes in that engine.  2) Send to Lycoming for their input. 

 

[Utah20Gflyer]

Two reports suggest borescoping the engine to check exhaust valve condition.  Seems like that would be the correct first step.