LOTUS EUROPA S1/S2 WORKSHOP MANUALSection K -- Cooling SystemLotus Europa Central -- Tech Specifications -- S1/S2 Workshop Home -- Manuals Home -- Feedback | |
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K.1 - GENERAL DESCRIPTION - Section Menu - Figure 1 -
A thermostat is also fitted on the outlet side of the water pump to ensure rapid engine warm-up. When starting from cold, the thermostat prevents coolant flow through the radiator block, until a predetermined temperature has been obtained. Upon reaching the operating temperature the thermostat will automatically redirect the coolant flow through the radiator. The cooling system is designed to operate at a pressure of 7 lb./sq. in. (0.49 kg/cm2). In addition to other benefits, this ensures greater engine efficiency. A pressure relief valve is combined with the radiator header tank cap. If the cap is to be removed when the engine is warm, care must be exercised to prevent injury from scalding. Instructions are stamped on the cap top. A 17 mm. hex. drain plug is provided at the rear right-hand side of the engine unit for draining the cylinder block. Should it be necessary to drain the main system, it is suggested that the lower hose connection to the radiator be detached at the pipe end and the coolant drained away below the steering unit. Since it is practically impossible to completely drain the heater system, a good quality glycol base anti-freeze solution, should be used during the winter months. In order to avoid an air lock when draining or refilling the cooling system, the heat control on the tunnel top should be placed in the 'Hot' position, and the tap on the radiator be opened (or vent plug be removed - Series One vehicles).
Coolant temperature is shown on an electrically operated instrument mounted on the facial panel. K.2 - DRAIN AND REFILL - Section Menu
If an anti-freeze mixture is being used, it is suggested that the coolant be drained into a suitable container and carefully preserved for replacement. To enable this operation to be carried out efficiently it is advisable to remove the chassis closing plate before placing the container beneath this area, at the lower water pipe to hose connection. From beneath the vehicle: remove the three bolts and spring and penny washers holding the rear of the chassis closing plate. Undo the two nuts and washers holding the front of the plate. Remove the two bolts and washers from within the front luggage compartment, and remove the plate by withdrawing the front lip of the plate from above the anti roll-bar. Place a clean container beneath the opening. To drain.
Remove the two steering unit access panels (attached by eleven self-tap screws). Remove the header tank filler cap. Remove the vent plug, (or open the tap) on the top of the radiator. - Figure 2 -
- Figure 3 -
Refit the chassis closing plate (if removed). Refit the two steering unit access panels. Replace the drain plug on the engine and tighten. Replace the header tank filler cap. Close vent tap or refit plug on radiator. NOTE (New Vehicles Only).
K.3 – FROST PRECAUTIONS - Section Menu To avoid the possibility of the cooling system freezing whilst the vehicle is stationary or whilst being driven in very cold weather, it is recommended that a reputable brand of anti-freeze solution should be used, and added in the quantities stipulated by the manufacturers. Owing to the difficulties in completely draining the heater system with normal draining of the engine cooling system, it is essential that anti-freeze is used when cold conditions are anticipated. An anti-freeze solution, based on inhibited ethylene glycol is recommended. Anti-freeze solutions using alcohol as a base are not suitable, as they are subject to loss by evaporation. The quantities of anti-freeze for various degrees of protection may differ slightly according to the manufacturers' recommendations. It is recommended as a guide that the following proportions of anti-freeze solution be used.
Instructions for this are normally available for the particular hydrometer in use. Before adding the anti-freeze solution, thoroughly flush out the cooling system (including cylinder block) and ascertain that all hoses and connections are in perfect condition.
K.4 - THERMOSTAT - REMOVING AND REPLACING - Section Menu To remove.
Remove the rear luggage compartment by undoing the two bolts set in the floor of the unit, taking care to note the quantity and position of the spacer washers situated between the cross member and the under surface of the compartment. - Figure 4 -
To replace.
Check that the thermostat leak hole is upwards, opposite the slot in the water pump. K.5 - WATER PUMP - REMOVING AND REFITTING - Section Menu To remove.
Drain the cooling system (see section K.2). Remove the outer camshaft pulley flange, the shims and the belt. Loosen-the alternator fastenings and remove the belt. Remove the alternator belt tension bolt on the pump. Disconnect the hoses from the water pump. Remove the pump securing bolts. Free it by means of a plastic mallet and remove it. Remove the backplate and clean the gasket faces. To refit.
Carefully remove any sharp edges from the ribs on the water pump ends in order to avoid damage to the hoses. The gaskets are fitted dry. - Figure 5 -
- Engage fourth gear. - Rotate the road wheel in the forward drive direction. - Figure 6 -
Run the engine and check for leaks. K.6 - HEADER TANK - TO REMOVE AND REPLACE - Section Menu To remove.
Undo the two hose clips adjacent to the header tank at inlet and outlet connectors. Remove the two self tap screws securing the heater control valve to the bracket on the header tank. Pull the vent pipe to the filler neck through the aperture in the side of the engine compartment. - Figure 7 -
To replace.
Refill the cooling system (see section K.2). NOTE. For information regarding the heater control valve, see section 'P' (Heating and Ventilation). K.7 - RADIATOR FAN - REMOVING AND REFITTING - Section Menu
To remove.
Remove the spare wheel and tool kit etc. from the lower compartment. Detach the red and black leads from the fan relay situated by the side of the washer bottle. Using a 7/16" A.F. socket wrench, undo the four Nyloc nuts and washers securing fan unit to the stud fixings on the radiator straps. Remove the fan unit from the vehicle. To replace.
Note:
K.8 - RADIATOR - REMOVING AND REFITTING - Section Menu To remove.
Remove the spare wheel and tool kit etc. from the lower compartment. Detach the red and black leads from the fan relay situated by the side of the washer bottle. Detach the two black leads from the thermostat on the side of the radiator. Drain the cooling system (see section K.2). Undo the two hose clips and detach both flexible pipes from the radiator. Undo the single 7/16" A.F. Nyloc nut and bolt securing the fixing strap on the top of the radiator to the wheel arch and remove the penny washer from within the arch. Undo the two 7/16' A.F. Nyloc nuts and penny washers from the mounting studs where they project through the under surface of the vehicle. Remove the radiator from the vehicle. To replace.
Refill with coolant (see section K.2). Note: Thermocontactor switch (radiator thermostat). Vehicles manufactured prior to Sept.1968, were equipped with a thermocontactor switch operating at 76/86° C. In order to improve the cooling, a revised switch operating at 68/82° C has been subsequently fitted. It is suggested that in the event of the original switch being unserviceable, it should be replaced by the new item. K.9 - RADIATOR FAN MOTOR - Section Menu
In certain circumstances, the brushes in the radiator fan motor can tip thus causing premature failure of the motor. The following modification to the brush gear of the motor will eliminate this problem, prolonging the life and increasing the efficiency of the motor. K.10 - RADIATOR COOLING FAN - Section Menu Commencing at Chassis No. 7003070089Q, a new cooling fan (Part No. A054 K 6002) has been introduced which has a reversed blade pitch. The new fan is directly interchangeable with the original unit, BUT since the fan blades now have a reversed pitch, to maintain the same direction airflow, the direction of rotation must be reversed. This is simply achieved by reversing the position of the cables fitted to the fan relay; transpose the RED cable to the black position and BLACK cable to the red position (see Fig.8).
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