4.1 Engine systems

• explain cooling systems used in engines
• describe types of manual starting systems used in engines
• illustrate the lubrication system used in engines
• explain the purpose of the exhaust system in an engine
• service the systems of a given engine
• appreciate the importance of engine systems

“How do engine systems operate?”

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1. Why an engine needs its systems
   40 min · 1 practice tasks · quiz
   State why a running engine needs cooling, oil, a way to start, and a path for the exhaust gas.
2. Liquid cooling around the block
   40 min · 1 practice tasks · quiz
   Trace the liquid-cooling path and name the parts on the school trainer.
3. The thermostat card
   40 min · 1 practice tasks · quiz
   Use this trainer thermostat card to decide when the radiator path is open.
4. The cap stays on while it is hot
   40 min · 1 practice tasks · quiz
   Explain the pressure cap with this card and keep it closed until the hose can be held.
5. Fins instead of a radiator
   40 min · 1 practice tasks · quiz
   Describe air cooling and judge a fin count against a card that wants every fin clear.
6. Kick, recoil and hand crank
   40 min · 1 practice tasks · quiz
   Describe the three manual starters and the hand rule for each.
7. What the oil is doing
   40 min · 1 practice tasks · quiz
   State the five jobs of engine oil and use the grade named on the cap.
8. Wet sump and the dipstick
   40 min · 1 practice tasks · quiz
   Describe a wet sump and add only the litres that take the dipstick from low to full.
9. Pressure feed and a dry tank
   40 min · 1 practice tasks · quiz
   Separate wet and dry storage from pressure feed, and stop if the oil lamp stays on.
10. Oil in the petrol
    40 min · 1 practice tasks · quiz
    Mix the small-engine card at 25 to 1 and keep that mix out of the trainer sump.
11. A path for the burned gas
    40 min · 1 practice tasks · quiz
    Explain the exhaust layout and keep a running engine out of a closed bay.
12. Clean the radiator fins
    40 min · 1 practice tasks · quiz
    Clean the trainer radiator with the engine off and cool, without crushing the fins.
13. Flush only when it is cool
    40 min · 1 practice tasks · quiz
    Flush the liquid cooling system into a marked container and refill with the named coolant.
14. Drain, filter, refill
    40 min · 1 practice tasks · quiz
    Change the trainer oil and filter, and stop at the 3.5 litre full mark.
15. A rope that must rewind
    40 min · 1 practice tasks · quiz
    Replace a frayed recoil rope under the teacher and leave kick and crank faults reported.