O-290Lycoming O-290

Parts most often named Float (3) · Carburetor (2) · Fitting (1)

COMPLAINT OF ROUGH RUNNING ENGINE, FOUND UPPER AND LOWER HALF OF CARBURETOR LOOSE ENOUGH SO LOWER HALF COULD BE SLID BACK AND FORTH. TOOK CARBURETOR APART, A VERY OLD STYLE VENTURI THAT AD APPLIED TO BUT IT NEVER GOT CHANGED. SENT CARBURETOR OUT FOR O/H. ACFT HAD BEEN IN STORAGE FOR MANY YEARS BEFORE CURRENT OWNER BROUGHT IT AND STARTED FLYING IT AGAIN.

THE CARBURETOR WAS REBUILT AND YELLOW TAGGED. FLOAT LEVEL WAS SET AT 9/32 INSTEAD OF THE REQUIRED 7/32 CAUSING A LEAN CONDITION THAT BURNED THE TOP END OFF THE MOTOR.

AN AIRCRAFT EXPERIENCED TOTAL POWER LOSS DURING A PERSONAL FLIGHT. AN EMERGENCY WAS DECLARED AND THE AIRCRAFT LANDED WITHOUT INCIDENT. INVESTIGATION OF THE ENGINE INCIDENT REVEALED THE FAILURE WAS CAUSED BY A FAULTY METAL FLOAT ON CARBURETOR. THE METAL FLOAT WAS FOUND FULL OF FUEL WHICH CAUSED FLOAT SINKING. THE METAL FLOAT PN 666-915 HAD BEEN REPLACED FROM COMPOSITE TYPE FLOAT ACCORDING TO MANUFACTURE SB MSA-1 AND IT WAS NOT AFFECTED BY THE AD 93-19-04 SB CF 1 92 DUE TO DIFFERENT CODE STAMP.

Parts most often named Camshaft (1) · Plug (1) · Bolt (1)

ENGINE CYLINDERS REMOVED DUE TO LOW COMPRESSION, FOUND PISTON PLUG BUTTONS MISSING ON ALL CYLINDERS. SCORING ON CYLINDER WALLS 48.9 HRS SINCE SUDDEN STOPPAGE INSPECTION.

SUDDEN STOPPAGE OF ENGINE. AFTER SUCCESSFUL OFF AIRPORT LANDING, ENGINE WAS INSPECTED AND FOUND CYLINDER NR 2 CONNECTING ROD BOLTS BROKEN/MISSING. BOLTS WERE INSTALLED IN SEPTEMBER 1999 AND HAD ACCUMULATED 487 HOURS.

ENGINE PURCHASED WITH A PARTIALLY ASSEMBLED HOMEBUILT AIRCRAFT. INFORMATION IN LOG INDICATED THE ENGINE HAS BEEN OVERHAULED APPROXIMATELY 6 HRS PRIOR TO AIRCRAFT COMPLETION. ON FIRST FLIGHT, PILOT COMPLAINT WAS LOW POWER. AFTER SEVERAL HOURS OF TROUBLESHOOTING, IGNITION, INTERNAL TIMING, AND OTHER ITEMS, TWO CAMSHAFT LOBES WERE FOUND WORN. SUBMITER STATED CAUSE IS SUSPECTED TO BE NO LUBRICATION DURING INITIAL RUNNING OF THE ENGINE.

Parts most often named Line (2)

ALUMINUM FUEL LINE CORRODED. MANUFACTURER WRAPS FRICTION TAPE ON TUBING FORMING CORROSION TRAP. SUBMITTER SUGGESTED REPLACEMENT WITH CORROSION PROOFED TUBING AND ELIMINATION OF FRICTION TAPE.

FUEL HOSE INTERNAL DETERIORATION RESULTING IN DECREASED FUEL FLOW TO CARBURETOR. SUBMITTER SUSPECTS AUTOFUEL AND/OR OLD AGE, INADEQUATE INSPECTION AND RECOMMENDED FUEL FLOW CHECK AT ANNUAL INSPECTION.

Parts most often named Valve (1) · Piston (1)

FOUND ENGINE EXHAUST VALVE STICKING. AIRCRAFT HAD BEEN OPERATED ON AVIA GAS. VALVE REQUIRED DISSASSEMBLY, CLEANING, AND LAPPING IN. SMOH: 525 HOURS.

DURING FLIGHT, THE PILOT REPORTED HEARING A SLIGHT KNOCKING IN THE ENGINE AND NOTED A 20 PSI DROP IN OIL PRESSURE. A PRECAUTIONARY LANDING WAS MADE WITHOUT INCIDENT. COMPRESSION CHECK REVEALED NR 3 CYLINDER LOW AT 50/80. CYLINDER REMOVAL REVEALED NR 3 PISTON SKIRT BROKE WITH 2 INCH BY 3 INCH PIECE LOCATED IN OIL SUMP OF ENGINE.

Parts most often named Support (1)

DURING AN ANNUAL INSPECTION, A CRACK WAS NOTICED ON THE FACE OF THE STARTER RING SUPPORT ASSY. A DYE PENETRANT TEST WAS DONE. THE TEST REVEALED THE CRACK WAS HALF-WAY AROUND THE STARTER RING GEAR SUPPORT, BUT NOT THROUGH THE RING GEAR ITSELF.

Parts most often named Switch (1)

ON GROUND RUN, AFTER INCIDENT, MAGNETO CHECKED NUMEROUS TIMES, NORMAL. EVENTUALLY, IT FAILED. RECHECKED NUMEROUS TIMES AND FOUND THAT SWITCH WAS GROUNDING INTERMITTENTLY. REPLACE SWITCH ON TIMELY INTERVALS.

Parts most often named Pump (1)

Parts most often named Spinner (1)