Cub Cadet Yanmar 3TNV72 - Manual (Page 198)

COOLING SYSTEM
TNV IDI Service Manual 8-7
Engine Coolant System Check
ENGINE COOLANT SYSTEM
CHECK
Check the engine coolant system for leakage.
1. With the radiator properly filled, install a cooling
system tester (Figure 8-3, (1)).
Figure 8-3
2. Apply 10.8 - 14.8 psi (75 - 105 kPa;
0.75 - 1.05 kgf/cm²) to the cooling system. If the
pressure reading drops, the engine coolant
system is leaking. Identify the source of the leak
and repair.
ENGINE COOLANT PUMP
Disassembly of Engine Coolant
Pump
Verify the condition of the engine coolant pump
before disassembling it from the engine. Check the
engine coolant pump shaft bearing for abnormal
noise, sticking, excessive play and water leakage.
Replace the coolant pump if any of these conditions
are present.
1. Make sure the engine and engine coolant are
not hot.
2. Before removing the engine coolant pump or
thermostat, it will be necessary to drain the
engine coolant. Drain the coolant into a clean
container if the coolant is to be reused.
Otherwise, properly dispose of the coolant.
• Drain the coolant from the radiator. See steps
1 - 4 in Drain, Flush and Refill Cooling System
with New Coolant on page 5-33.
3. Loosen the alternator mounting bolts. Loosen
and remove the V-belt and rotate the alternator
away from the engine and out of the way.
4. Remove the engine coolant fan guard (if
equipped), engine coolant fan (Figure 8-4, (1)),
spacer (Figure 8-4, (2)) and engine coolant
pump V-pulley (Figure 8-4, (3)).
Figure 8-4
5. Disconnect the coolant hoses and the
temperature switch lead wire from the engine
coolant pump.
CAUTION
If the engine coolant pump must be
replaced, replace the engine coolant
pump as an assembly only. Do not
attempt to repair the engine coolant
pump or replace individual components.
0000041en
(1)
0000577A
A
CAUTION
PINCH HAZARD!
Carefully rotate the alternator toward the
cylinder block while loosening the
V-belt. Failure to comply may result in
minor or moderate injury.
0000014en
(1)
(3)
(4)
(2)
0001959B
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