F300-CO-Cooling_System-Part1
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DAIHATSU
F300
[HD Engine]
COOLING SYSTEM
TROUBLE SHOOTING
PRECAUTIONS COOLING SYSTEM OUTLINE
RADIATOR
WATER PUMP
FAN-EQUIPPED FLUID OOUPLING CHECK & CHANGE OF ENGINE ..............
THERMOSTAT
TIGHTENING TORQUE SERVICE SPECIFICATION
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GOOLING SYSTEM
TROUBLE SHOOTING
Problem Possible cause
Remedies
0%-Tails' W
Poor quality coolant
water pump drive belt lense or missing
Dirt. leaves Dr insects on radiator
iam
Leaky hoses. water pump, thermostat housing, radiator. heater. core plugs
or head gasket
Thermostat faulty
i Ignition timing retarded 1 Radiator hose plugged or deteriorated
; Water pump faulty
Radiator plugged or cap faulty
Cyiinder head or block cracked or plugged
Repienish coolant.
Adjust or replace belt.
Clean radiator.
Repair as necessary.
Check iherrnostat.
Set timing.
Replace hose.
Replace waser pump.
Check radiaton
Repair as necessary.
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PRECAUTIONS
- As regards water to be used as cooling water, use soft water which does not contain salts of minerals,
calcium, magnesium and so forth.
0 If the coolant gets to the vehicle body, immediately flush away the coolant using water.
0 Never open the radiator cap when the cooling water is hot.
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COOLING SYSTEM OUTLINE
The cooling system is a water-cooled. forced-circulation type, Furthermore, it employs a fluid coupling fan. The cooling system employs a bottom by-pass type in which the thermostat equipped with a by-pass valve is provided at the inlet side.
cylinder block, water hoses and their connecting parts. The total capacity of the cooling water is approximately 6.5 dm’ (including one liter for the reserve tank.)
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1 Water bypass
Heater care
Water iniet
HOSE
Radiator outlet hose
Radiator reservoir tank
Throttle body air vawe
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COOLING SYSTEM
SCHEMATIC DIAGRAM OF COOLING SYSTEM PASSAGE INSIDE ENGINE
To intake manifold bleeding tube
Thermostat
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To heater core Ai
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To water outlet
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COOLING SYSTEM
H W
RADIATOR I Z E2 "
Radiator specification
Hem
Skgcdication
Radiator water capacity V V I W if
dm” | 2.1 | 2.1 1
RADIATOR CAP
A pressure type radiator cap is installed at the upper part of the radiator. The radiator cap has two valves: a pressure regulating valve and a negative pressure valve. When the pressure ofthe cooling system exceeds a specified limit, the rising pressure opens the pressure regulating valve of the radiator cap. As a result. the cooiant in the radiator flows to the reserve tank.
On the other hand, the negative pressure valve opens when the inner pressure drops below the atmospheric pressure due to a dropped water temperature after the engine has stopped. Thus. the coolant returns from the reserve tank tothe radiator.
Radiator cap specifications
RADIATOR RESERVE TANK
A reserve tank with an overflow hose is employed. The radiator reserve tank is attached to the radiator side bracket.
Specifications
Cooling water capacity
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COOLING SYSTEM
RADIATOR HOSES & PIPES
These components come in four radiator hoses and two radiator pipe subassembkies.
Radiator hose
Radiator pipe N02 10 inlet of cyiinder block seciion Radiator lower tank to radiator pipe No.2 Outlet at rear of cylinder head to radiator pipe No.1
Radiator hcse No.4 to radiator hose No.1
Radiator pipe No,1 to radiator upper tank Radiator pipe N02 to inlet of cylinder bio Radiator lower tank to radiator pipe No.2 Outlet at rear of cylinder head to radiator
Radiator hose No.4 to radiator hose No.1 Radiator hose No.3 to radiator hose No.2
outlet
Radiator
Radiator pipe No.2 1 1 Radiator hose 3 No.3
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COOLING SYSTEM
The fan-equipped fluid coupling with a temperature control / /
FAN-EQUIPPED FLUID COUPLING U 0 The fan-equipped fluid coupling with a temperature control " device is empioved in order that the noise level mav be
Specifications
Fan outer diameter "mm 'rf 366
2. FLUID COUPLING WITH FAN
The fluid coupling employs a two-stage temperature control type. The fluid coupling is available in three kinds. The optimum fluid coupling can be selected and installed in accordance with the vehicle speciiications.
wFE90-00017
Specifications
General The U.S. | Tropical
Fiuid coupling outer diameter mm & $27 135 W I M
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Operation of coupling fan During cold operation (Below about 55°C) When the copling water temperature is low, the port is closed by the coupling divider. Ccmsequentiy. the silicizin oil will not move into the operating chamber. Hence, the coupling body remains at its low speed operation.
During hot operation (Above about 70°C; above about 65°C on tropical specifica- lions) Wheo the spiral bfmetal detects the temperature of the air passing through the radiator, this rotates the coupling divider integral with the bimetal shaft. Ae a result, the silicon oil flowing out from the port enters into the operating chamber, thus push- ing the coupling rotor. Consequently, the coupling body is rotated. As is explained above, the revolution speed of the coupling fan is switched over two stages. ln this way, the output loss due to the cooling fan has been kept at a minimum level and the fan noise level has been reduced.
3. WATER PUMP PULLEY
The water pump pulley made of sheet metal. This pulley is attached to water pump pulley seat along with the fluid coupling by means of four nuts. The water pump pulley equipped with two kind pulley of right figure.
WATER PUMP
The water pump used for circulating the cooling water is in- stalled at the front section of the cylinder block,
Specifications
| Centrifugal TYPE Type
Delivery ouiput dmifmin (When shaft fevolmion speed is 200 rpm)
Rotor outer diameter mm | '62
General US spc
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THERMOSTAT
The thermostat is a wax type with a bypass valve. The thermostat helps the engine to warm up quickly by allowing the cooling water to be reclrculated through the cylinder block and cylinder head without passing through the radiator. Furthermore, the thermostat is equipped with a jiggle pin which performs the air bleeding while the engine is stopped. Also, the jiggle pin allows the temperature of the cooling water to rise quickly during the warming-up period. Moreover, a baffle plate attached to the thermostat makes it possible to get better temperature sensing characteristics.
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000.8
WFEQO-C0022
Thermostat specifications
Item I Standard specifications | Cold region specifications
Valve opening temperature
