Cooling System Service Information; Cooling System Specifications; Cooling System Torque Value; Cooling System Tools - Honda CH250 Elite 1986 Service Manual

12. COOLING SYSTEM
SERVICE INFORMATION
TROUBLESHOOTING
SYSTEM TESTING
COOLANT REPLACEMENT
SERVICE INFORMATION
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12-2
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RADIATOR
WATER PUMP
THERMOSENSOR
THERMOSTAT
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12-6
12-10
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• Do not remove the radiator cap when the engine is hot. The coolant is under pressure and severe scalding could result. The engine
must be cool before the cooling system. .
• Use only distilled water and ethylene glycol in the cooling system. A50-50 mixture is recommended for maximumcorro-
sion protection. Do not use alcohol-based antifreeze.
• Add coolant at the reserve tank. Do not remove the radiator cap except to refill or drain the system.
• The cooling service can be done with the engine in the frame.
• Avoid spilling on painted surfaces.
• After the .system, check for leaks with
a
cooling system tester.
• Refer to section 17 for fan motor thermostatic switch and temperature gauge inspections.
SPECIFICATIONS
Radiator cap relief pressure 75-105 kPa (0.75-1.05 kg/cm 2 , 10.7-14.9 psi)
f - - - - - - - - - - - - - - - -
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.'" point (Hydrometer test)
55 % distilled water + 45 % ethylene glycol: - 32°C (- 26°FI
50 % distilled water +·50 % ethylene glycol: - 37°C (- 35°F)
45 % distilled water + 55 % ethylene glycol: - 44.5°C (- 48°FI
Coolant capacity: Radiator and engine 1.0 lit (1.1 US qt, 0.9 Imp qt)
Reserve tank
0.35 lit (0.37 US qt, 0.31' Imp qt)
system 1.35 lit (1.47 US qt, 1.21 Imp qt)
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Begins to open: 69.5°C to 72.5°C (157°F to 162°F)
Valve lift: 3.5-4.5 mm 10.14-0.18 in) at 80 0
t
(176°Fj
Soitlng
(with 50-50 mixturej Unpressurized: 107.7°C (226°Fj
Cap on, pressurized: 125.6°C (25BOFl
hand threads) 10-14 N'm (1.0-1.4 kg-m, 7 -1 0 ft-Ibl
TOOLS
Sp~cial
Mechanical
driver attachment
07945-4150400 or
GN-AH-065-415 (U.S.A. only)
Common
Remover weight
Driver
07741 -0010200 or
07936-3710200
07749-0010000
remover, 15 mm
07936-KC10500
TROUBLESHOOTING
Engine temperature too high
• Faulty temperature gauge or gauge sensor
• Faulty radiator cap
• Thermostat stuck closed
• Insufficient coolant
• Passages blocked in radiator, hoses or water jacket
• Faulty water
• Faulty fan motor
Engine temperature too low
• Faulty temperature gauge or gauge sensor
• Thermostat stuck open
Coolant leaks
• Faulty pump mechanical seal
• Deteriorated O-rings
• Damaged or deteriorated hoses
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