I have the engine on a test stand. I noticed some excessive vibration at 7600 +/- on a balanced APC 16-10 backed off some (500/600) and vibration disappeared. Upon inspection both upper and lower port mount bolts had snapped off! The bolts were installed with Locktite less than a week ago. They were both clean fresh breaks. Total run time on engine is less than 3 hours.


Is this a common occurance with these engines? OR did I possibly miss something in setting it up? Any thoughts appreciated.