What was found
PILOT REPORTED AN UNUSUAL VIBRATION DEVELOPING IN FLIGHT BETWEEN 2200-2400 RPM. I FOUND THE #5 CYLINDER EXHAUST VALVE GUIDE, PN: 636242P005, WAS LOOSE, FLOATING IN THE CYLINDER. LOGBOOKS INDICATE THE #5 CYLINDER WAS AN OVERHAULED CYLINDER. THE CYLINDER WAS OVERHAULED BY CMS CONTINENTAL MOTORS SERVICES, 8600 COUNTY ROAD 32, FAIRHOPE, ALABAMA, 36532. WORK ORDER # CS-9224, DATED NOVEMBER 15TH 2019. CYLINDER PN: 658595 SN: AC17CB527. THE OVERHAULED CYLINDER WAS INSTALLED 11/27/2019 AND HAS 836.9 HOURS OF OPERATION SINCE OVERHAUL.