Kymco MO GD125, MO GD 150 Service Manual - chap 12 (raffreddamento)

12. COOLING SYSTEM

12-0

GRAND DINK 125/ 15 0

12

__________________________________________________________________________________

COOLING SYSTEM

__________________________________________________________________________________

SCHEMATIC DRAWING ---------------------------------------------- 12- 1

SERVICE INFORMATION -------------------------------------------- 12- 2

TROUBLESHOOTING ------------------------------------------------- 12- 2

COOLING SYSTEM TESTING --------------------------------------- 12- 4

RADIATOR -------------------------------------------------------------- 12- 4

WATER PUMP ---------------------------------------------------------- 12- 9

THERMOSENSOR ------------------------------------------------------ 12-15

THERMOSTAT---------------------------------------------------------- 12-16

12

12. COOLING SYSTEM

12-1

GRAND DINK 125/ 15 0

SCHEMATIC DRAWING

Torque: 9.8_ 13.7N-m

Left Hand Threads

＊

12. COOLING SYSTEM

12-2

GRAND DINK 125/ 15 0

SERVICE INFORMATION

GENERAL INSTRUCTIONS

• The water pump must be serviced after removing the engine. Other cooling system service can be

done with the engine installed in the frame.

• The engine must be cool before servicing the cooling system.

When the coolant temperature is over 100℃ , never remove the radiator cap to release the pressure because the boiling coolant may cause danger.

• Avoid spilling coolant on painted surfaces because the coolant will corrode the painted surfaces.

Wash off any spilled coolant with fresh water as soon as possible.

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

SPECIAL TOOL

Mechanical seal driver

TORQUE VALUES

Water pump impeller 9.8_ 13.7N-m Water pump cover bolt 7.8_ 11.8N-m

TROUBLESHOOTING

Engine temperature too high Coolant leaks

• Faulty temperature gauge or thermosensor • Faulty pump mechanical (water) seal

• Faulty radiator cap • Deteriorated O-rings

• Faulty thermostat • Damaged or deteriorated water hoses

• Insufficient coolant

• Passages blocked in hoses or water jacket

• Clogged radiator fins

• Passages blocked in radiator

• Faulty water pump

Temperature gauge pointer does not register the correct coolant temperature

• Faulty temperature gauge or thermosensor

• Faulty thermostat

12. COOLING SYSTEM

12-3

GRAND DINK 125/ 15 0

SPECIFICATIONS

Radiator cap relief pressure

0.9±0.15kg/cm_

Begins to open

80±2℃

Thermostat temperature

Full-open

90℃

Valve lift

3.5_ 4.5mm

Coolant capacity

Total system

1400±20cc

Radiator: 1000±20cc Reserve tank: 400±20cc

COOLANT GRAVITY

Temp. ℃

Coolant concentration

05101520253035404550

5%

1.009

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

1.049

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

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.

12. COOLING SYSTEM

12-4

GRAND DINK 125/ 15 0

COOLING SYSTEM TESTING

RADIATOR CAP INSPECTION

Install the radiator cap onto the radiator tester and apply specified pressure to it. It must hold specified pressure for at least six seconds.

Radiator Cap Relief Pressure:

0.9±0.15kg/cm_

Install the radiator tester onto the radiator and apply specified pressure to it. It must hold specified pressure for at least six seconds. Check the water hoses and connectors for leaks.

RADIATOR

RADIATOR INSPECTION

Remove the front upper cover. (!2-5) Remove the front lower cover. (!2-5)

Radiator Cap

Radiator Tester

The test pressure should not exceed 1.05 kg/cm_. Excessive pressure can damage the radiator and its hose connectors.

＊

Apply water to the cap sealing surface before testing.

＊

12. COOLING SYSTEM

12-5

GRAND DINK 125/ 15 0

Inspect the radiator soldered joints and seams for leaks. Blow dirt out from between core fins with compressed air. If insects, etc., are clogging the radiator, wash them off. Carefully straighten any bent fins.

RADIATOR REMOVAL

Drain the coolant. (!3-9) Disconnect the air vent tube from the radiator filler. Remove the overflow tube clamp and disconnect the overflow tube.

Loosen the hose band and disconnect the upper hose and lower hose from the radiator.

Air Vent Tube

Lower Hose Upper Hose

Overflow Tube