Yanmar YM276 Service Manual page 148

Cooling System 20-25-3
TESTING COOLING SYSTEM
CHECKING COOLING SYSTEM
1. Tilt hood forward.
2. Visually check the radiator for leaks or damage
3. Remove radiator cap.
4. Attach Pressure Pump t o filler neck
5. Use pump t o apply 147 Kpa (1.50 kgkm2) (21 psi) compressed
air t o system.
6. Check radiator, hoses, water pump and engine for leaks.
CHECKING RADIATOR CAP
1. Remove cap and attach t o Pressure Pump.
2. When pressurized, cap should maintain 73 to 103 Kpa (0.74
t o 1.05 kglcm' ) (11 t o 15 psi).
CHECKING BELT TENSION
Check tension of fan belt and adjust i f necessary, Fan belt should
deflect 10 t o 15 mm (318 t o 518 inch) when 98N (10 kg)
(22
Ibs.) force i s applied.
WATER PUMP
REMOVAL AND DISASSEMBLY
1.
Drain cooling system.
2.
Remove fan belt.and water pump hoses from water pump.
3. Remove water pump-to.thermostat housing cap screws and
remove water pump.
4. Use a press t o push bearing shaft from fan hub.
5.
Remove bearing retainer snap ring from water pump housing.
-
6. Support water pump in a press as shown. Press bearing from
impeller and water pump housing.
YM276and 2760
1863409
SME.27601116304
Kinornolo, Primed in Jamn