What was found
IN THE PREVIOUS SEVERAL WEEKS, AN OIL LEAK WAS IDENTIFIED COMING FROM SOMEWHERE BEHIND THE OIL DIPSTICK/FILLER TUBE. IT WAS THOUGHT THAT A GASKET BETWEEN THE TUBE ASSEMBLY AND THE CRANKCASE WAS LEAKING SO IT WAS REPLACED. OIL CONTINUED TO LEAK SO THE NR 2 CYLINDER WAS REMOVED TO INVESTIGATE A POSSIBLE CYLINDER BASE SEAL LEAK. DURING THE PROCESS OF REMOVING AND PREPARING TO REINSTALL THE CYLINDER, A CAREFUL VISUAL INSPECTION REVEALED A CRACK BELOW THE SEVENTH STUD BOSS BETWEEN CYLINDER NR 2 AND 4. FURTHER EXAMINATION REVEALED THAT THE CRACK WAS ALSO VISIBLE INSIDE THE NR 2 CYLINDER PORT ON THE MAIN BEARING BOSS BETWEEN CYLINDER NR 2 AND CYLINDER NR 4.