Cub-cadet Yanmar 3TNV72 User Manual download pdf (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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Cub-cadet Yanmar 3TNV72 User Manual Page 198

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