As investigation result, this water pump was found trace of leakage in drain hole and. For impeller water pump was found rusty which might occurred by LLC was not applied. About bearing was found unsmooth of rotation, Result of leakage test was leak. After cut check part found crack 2 points of crack on matting ring, for sealing ring was found wear. Water pump leakage is possible that caused by the LLC was not applied and might there is contamination in Cooling system resulted in seal leak, Bearing damage is possible that water or LLC leak off cooling system, then leak in Bearing resulted in bearing damage, bearing was working centrifugal force of bearing shaft’s imbalance and occurred load on seal surface resulted in Seal crack and Water or LLC leak off system.
However, this bearing is needed more of investigation to find the failure of bearing by TBKK’s supplier.