What was found
(CAN) DURING A NORMAL WATER PICKUP FOR FIRE FIGHTING OPERATIONS, THERE WAS A NOTICEABLE LOSS OF MANIFOLD PRESSURE(MP) AND BMEP INDICATIONS. ON NR 1 POWER REDUCTION THERE WAS A SMALL BACKFIRE AND FURTHER LOSS OF MP AND BMEP. WATERLOAD WAS JETTISONED AND FLIGHTCREW REDUCED POWER TO CLIMB. THEY CLIMBED TO CRUISE ALTITUDE AND NOTICED A SMALL OIL LEAK AND SMOKE TRAIL. ALL OTHER INDICATIONS WERE NORMAL EXCEPT FOR A COLD CYLINDER HEAD TEMP. AFTER APPROX.: 45 WITH A SMOKE TRAIL AND OIL LEAK APPARENTLY GETTING WORSE, THE FLIGHTCREW SHUT DOWN AND SECURED THE RT ENGINE. AME FOUND CRACKED NR 2 CYCLINDER AND BROKEN PUSHROD AND HOUSING. CYLINDER WAS REPLACED, SCREEN CHECKED OK. ENGINE GROUND RUN AND FOUND SERVICEABLE. (TC