Combustion heat could effect in the metal engine parts. The heat could melt piston, crack or wrap the cylinder head or hock, cause valves to burn or the head gasket to “blow”. This chapter discusses these problems.
In an efficient cooling system in good order there is fairly equal distribution of heat throughout, with higher temperature at components in higher position. Blockages and air locks can usually detected by noting the sudden change in temperature at the location of the fault. Any engine oil leaking into the coolant through a faulty head gasket or cracked jacket will soften the inner walls of hoses. A thermometer should be used to check that the working temperature of the engine is kept within the range recommended by the manufacturer, usually between 75°C and 95°C. The fan belt should be free from cracks or loose material and must not he so thin as to ‘bottom’ in the vee pulley when ii will slip under load.
A small crack in the cylinder head or a leaking gasket may shown-up only under heavy engine load conditions. Loss of coolant or a high running temperature not found during stationary tests may be due to these defects.
Faulty ignition, carbonation, and compression may each give rise to overheating. Overcooling causes loose of power and poor fuel economy. A temperature test is an essential feature of check of engine performance).
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