Kymco MO X500 Service Manual - chap 06 (raffreddamento)

6. COOLING SYSTEM

XCITING 500

6

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COOLING SYSTEM

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SYSTEM FLOW PATTERN----------------------------------------------- 6- 1

SERVICE INFORMATION------------------------------------------------ 6- 2

TROUBLESHOOTING----------------------------------------------------- 6- 4

COOLING SYSTEM TESTING------------------------------------------- 6- 5

COOLANT REPLACEMENT --------------------------------------------- 6- 5

THERMOSTAT-------------------------------------------------------------- 6- 8

WATER PUMP -------------------------------------------------------------- 6-10

RADIATOR ------------------------------------------------------------------ 6-13

FAN MOTOR SWITCH ---------------------------------------------------- 6-16

WATER TEMPERATURE SENSOR ------------------------------------ 6-17

RAIDATOR RESERVE TANK ------------------------------------------- 6-18

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6. COOLING SYSTEM

SCHEMATIC DRAWING

XCITING 500

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6. COOLING SYSTEM

XCITING 500

SERVICE INFORMATION

GENERAL INSTRUCTIONS

WARING:
Removing the radiator cap while the engine is hot can allow the coolant to spray out,

seriously scalding you. Always let the engine and radiator cool down before removing the
radiator cap.

CAUTION:
Radiator coolant is toxic. Keep it away from eyes, mouth, skin and clothes.

• If any coolant gets in your eyes, rinse them with water and consult a physician immediately.

• If any coolant in swallowed, induce vomiting, gargle and consult a physician immediately.

• If any coolant gets on your skin or clothes, rinse thoroughly with plenty of water.

NOTE:

Use coolant with silicate inhibitors may cause premature wear of water pump seals or blockage of
radiator passages. Using tap water may cause engine damage.

• This section covers service of the cooling system.

• These services can be done with the engine installed in the frame.

• Add coolant at the reserve tank. Do not remove the radiator cap except to refill or drain the

system.

• All cooling system services can be done with the engine in the frame.

• Avoid spilling coolant on painted surfaces.

• After servicing the system, check for leaks with a cooling system tester.

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6. COOLING SYSTEM

p

SPECIFICATIONS

ITEM SPECIFICATIONS

Radiator and engine 2 liter (2.1 US qt, 1.76 lmp qt)Coolant capacity

Reserve tank 0.37 liter (0.4 US qt, 0.33 lmp qt)
Radiator cap relief pressure 108 kPa (1.1 kgf/cm2, 16 psi)
Thermostat

Standard coolant concentration 1:1 mixture with soft water

COOLANT GRAVITY CHART

Tem

. ℃

Coolant
concentration

5% 1.009 1.009 1.008 1.008 1.007 1.006 1.005 1.003 1.001 0.009 0.997

10% 1.018 1.107 1.017 1.016 1.015 1.014 0.013 1.011 1.009 1.007 1.005

15% 1.028 1.027 1.026 1.025 1.024 1.022 1.020 1.018 1.016 1.014 1.012

20% 1.036 1.035 1.034 1.033 1.031 1.029 1.027 1.025 1.023 1.021 1.019

25% 1.045 1.044 1.043 1.042 1.040 1.038 1.036 1.034 1.031 1.028 1.025

30% 1.053 1.051 1.051 1.049 1.047 1.045 1.043 1.041 1.038 1.035 1.032

35% 1.063 1.062 1.060 1.058 1.056 1.054 1.052 1.049 1.046 1.043 1.040

40% 1.072 1.070 1.068 1.066 1.064 1.062 1.059 1.056 1.053 1.050 1.047

45% 1.080 1.078 1.076 1.074 1.072 1.069 1.056 1.063 1.062 1.057 1.054

50% 1.086 1.084 1.082 1.080 1.077 1.074 1.071 1.068 1.065 1.062 1.059

55% 1.095 1.093 1.091 1.088 1.085 1.082 1.079 1.076 1.073 1.070 1.067

60% 1.100 1.098 1.095 1.092 1.089 1.086 1.083 1.080 1.077 1.074 1.071

Begin to open 80 - 84°C (176 - 183°F)
Fully open 95°C (203°F)
Valve lift 8 mm (0.3 in) minimum

0 5 10 15 20 25 30 35 40 45 50

XCITING 500

COOLANT MIXTURE (WITH ANTI-RUST AND ANTI-FREEZING EFFECTS)

Freezing Point Mixing Rate KYMCO SIGMA Coolant Concentrate Distilled Water

-9℃ 20%

-15℃ 30% 425cc 975cc

-25℃ 40%

-37℃ 50%

-44.5℃ 55%

Cautions for Using Coolant:

• Use coolant of specified mixing rate. (The mixing rate of 425cc KYMCO SIGMA coolant
concentrate + 975cc distilled water is 30%.)

• Do not mix coolant concentrate of different brands.

• Do not drink the coolant which is poisonous.

• The freezing point of coolant mixture shall be 5℃lower than the freezing point of the riding

area.

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6. COOLING SYSTEM

TORQUE VALUES

Water pump cover bolt 13 N•m (1.3 kgf•m, 9 lbf•ft)

Fan motor bolt 5 N•m (0.53 kgf•m, 3.8 lbf•ft)

Radiator shroud mounting nut 9 N•m (0.9 kgf•m, 6.5 lbf•ft)

TROUBLESHOOTING

Engine temperature too high

• Faulty radiator cap

• Faulty temperature gauge or thermosensor

• Air in system

• Thermostat stuck closed

• Insufficient coolant

• Passages blocked in radiator, hoses or water jacket

• Faulty cooling fan motor

• Faulty fan motor switch

• Faulty water pump

XCITING 500

Engine temperature too low

• Faulty temperature gauge or thermosensor

• Thermostat stuck open

• Faulty fan motor switch

Coolant leak

• Faulty water pump mechanical seal

• Deteriorated O-rings

• Faulty radiator cap

• Damaged or deteriorated cylinder head gasket

• Loose hose connection or clamp

• Damaged or deteriorated hoses

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6. COOLING SYSTEM

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COOLING SYSTEM TESTING

XCITING 500

RADIATOR CAP INSPECTION

Remove the radiator cap (page 6-6).

Pressure test the radiator cap.
Replace the radiator cap if it does not hold
pressure, or if relief pressure is too high or
too low.
It must hold the specified pressure for at
least six seconds.

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Before installing the cap in the tester,
wet the sealing surfface.

Radiator Cap Relief Pressure:

108 kPa (1.1 kg/cm², 16 psi)

Pressurize the radiator, engine and hoses,
and check for leaks.

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Excessive pressure can damage the
cooling system components. Do not
exceed 137 kPa (1.4 kg/cm², 20 psi).

Cap Teste

Radiator Cap

Cap Teste

Repair or replace components if the system
will not hold the specified pressure for at
least six seconds.

COOLANT REPLACEMENT

PREPARATION

● The effectiveness of coolant decreases

with the accumulation of rest or if there is
a change in the mixing proportion during
usage. Therefore, for best performance
change the coolant regularly as specified
in he maintenance schedule.

● Mix only distilled, low mineral water

with the antifreeze.

Recommended mixture:

1:1 (Distilled water and antifreeze)

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