FIGURE 6.1 below shows the crankshaft of a four-cylinder in-line engine. Answer the questions that follow. 6.1.1 What is the main function of the crankshaft shown in FIGURE 6.1? 6.1.2 Label A–G, the parts of the crankshaft, as shown in FIGURE 6.1. 6.1.3 State TWO firing orders of a four-cylinder in-line engine. FIGURE 6.2 below shows a component that is fitted to an internal combustion engine to increase the power output. Answer the questions that follow.

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FIGURE 6.1 below shows the crankshaft of a four-cylinder in-line engine - NSC Mechanical Technology Automotive - Question 6 - 2020 - Paper 1

Question 6

FIGURE 6.1 below shows the crankshaft of a four-cylinder in-line engine. Answer the questions that follow. 6.1.1 What is the main function of the crankshaft shown i... show full transcript

Worked Solution & Example Answer:FIGURE 6.1 below shows the crankshaft of a four-cylinder in-line engine - NSC Mechanical Technology Automotive - Question 6 - 2020 - Paper 1

Step 1

What is the main function of the crankshaft shown in FIGURE 6.1?

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Answer

The main function of the crankshaft is to convert the reciprocating motion of the piston into rotary motion. This transformation is vital for the engine's operation, as it allows the power generated from the combustion process to be utilized in a rotational form.

Step 2

Label A–G, the parts of the crankshaft, as shown in FIGURE 6.1.

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Answer

A. Crank pulley mounting / Vibrational damper mounting
B. Crank nose
C. Main oil way
D. Main journal oil hole
E. Flywheel mounting / Crank shaft flange
F. Counterweights / Balance weight / Balancing mass
G. Crankpin (big-end) journal

Step 3

State TWO firing orders of a four-cylinder in-line engine.

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Answer

1 – 3 – 4 – 2
1 – 2 – 4 – 3

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