What was found
DURING INVESTIGATION OF AN ACCIDENT IN WHICH ACFT LOST POWER AND WAS FORCED TO LAND THE FOLLOWING WAS DISCOVERED: COMPRESSION CHECK REVEALED THE NR 1 CYL WAS LEAKING PAST THE EXHAUST VALVE. (COMPRESSION 45/80). EXAMINATION OF THE CYLINDER REVEALED THE EXHAUST GUIDE WAS EXTREMELY WORN AND CRACKED IN 4 PLACES. VALVE OD .496 INCH GUIDE ID .540 INCH, .044 INCH CLEARANCE. IT WAS FURTHER DISCOVERED THAT THE VALVE WAS PN SL-16740 NIMONIC VALVE GUIDE. THIS VALVE REQUIRES THE USE OF A HIGH CHROME CONTENT NI-RESIST VALVE GUIDE. ECI VALVE GUIDE AEL 75838 WAS FOUND INSTALLED. THIS IS A NI-RESIST VALVE GUIDE. ECI VALVE GUIDE AEL 75838 WAS FOUND INSTALLED. THIS IS A NI-RESIST GUIDE. HOWEVER IT DOES NOT HAVE THE CHROME CONTENT OF THE AEL75838HC AND ACCELERATED WEAR WILL RESULT.