What was found
(CAN) PUMP S/N 856871. DETECTED SQUEAKING WHEN TURNING PROPELLER DURING TEARDOWN FOR ENGINE CHANGE. PUMP REMOVED. HARDLY ABLE TO TURN IT BY HAND. INSTALLED 14 FEB. 2000 AT 12269.2 = 6 MS AND 361.6 HRS. REMOVED 06 JUL.2000 AT 12630 = 6 MS & 361.6 HRS. WHEN INSTALLED, MAN. INSTRUCTIONS FOLLOWED METICULOUSLY CLEAN HOSES, COOLING HOSE AND BAFFLE, R.V. FILTERS. 133-5-1 FILTERS REPLACED EVERY 100 HOURS. NOTE: POOR DESIGN: PUMP BREATHERS FROM AIR INTAKE UNDER NACELLE NEAR COWL FLAPS AND EXHAUSTS.