Ive been picking up a small amount of brass fines/flakes in the oil filter on my 300 hr SMOH 0-360 A1A for a while now. Its enough to see, but not any measurable quantity. Oil analysis has copper and aluminum a bit high at 13 and 14 respectively. I had AvLab analyze the filter element to learn exactly what I've got; for $135 I was hoping for part numbers but instead they report the majority of the debris is Brass AMS #4610, with a trace of AMS #4280 aluminum.
Ill call Lycoming in the am and see if I can get some help on what parts are made from AMS#4610, meanwhile I thought Id toss it out and see if anyone has ideas. Im thinking rocker arm or idler gear bushing maybe. Trying to recall where else brass bushings are used other than the connecting rods. All these were sent out for rework at overhaul. Ive got one Slick with an impulse coupler, seems like they have brass bushings but dont recall for sure.
Ideas???
Thanks, Tim
Ill call Lycoming in the am and see if I can get some help on what parts are made from AMS#4610, meanwhile I thought Id toss it out and see if anyone has ideas. Im thinking rocker arm or idler gear bushing maybe. Trying to recall where else brass bushings are used other than the connecting rods. All these were sent out for rework at overhaul. Ive got one Slick with an impulse coupler, seems like they have brass bushings but dont recall for sure.
Ideas???
Thanks, Tim