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What are the different temperatures at which thermostats fully opens for petrol and diesel engine respectively?

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in Farm Machinery by (38.9k points)
What are the different temperatures at which thermostats fully opens for petrol and diesel engine respectively?

(a) 106°C;120°C

(b) 89°C;98°C

(c) 82°C;90°C

(d) 100°C;102°C

I have been asked this question in my homework.

The doubt is from Cooling System topic in chapter Fuel Supply and Cooling System of Farm Machinery

1 Answer

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Correct answer is (c) 82°C;90°C

Explanation: The purpose of thermostat is to close the water passage, between cylinder head and the top of radiator, when the engine is cold so that water circulation is restricted causing the engine to reach operating temperature more quickly. Thermostats are designed to start opening at 70°C-75°C and the fully open at 82°C for petrol and 90°C for diesel engine.

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