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... MAINTENANCE Sparking Plug Gap The clearance ‘A’ should be set at .025 in. (.64 mm.). COOLING SYSTEM '"THE engine cooling system is sealed and pressurised, thus raising ^ the coolant boiling point to 224°F. (107°C.). A pressure relief valve located in the radiator filler cap, opens at approximately 4 lbs. per sq. in. Circulation is by means of a centrifugal type pump and a thermostat regulates the coolant temperature. Topping Up: This should only be necessary very occasionally to replace water lost through evaporation. Use only rain water, if available, or clean soft water, and fill to the bottom of the filler cap well when the engine is cold. N.B .—Under no circumstances should the radiator filler cap be removed if the coolant temperature is above boiling point or if the engine is running. Draining the System: There are two drain cocks; one positioned at the bottom of the radiator, and the other on the left side of the cylinder block. Open both cocks and ascertain that the vehicle is standing on level ground while draining. When draining in freezing weather, do so when the engine is hot. Run the engine slowly for one minute when the water has ceased flowing to clear any water left in the pump and other places where it might collect. Finally, leave a reminder on the vehicle to the effect that the cooling system has been drained. 45 ...
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