5.1 The steps to conduct a compression test on an internal combustion engine are listed below - NSC Mechanical Technology Automotive - Question 5 - 2021 - Paper 1
Question 5
5.1 The steps to conduct a compression test on an internal combustion engine are listed below. Complete STEPS 5 to 8.
STEP 1 Ensure the engine is at operating tempe... show full transcript
Worked Solution & Example Answer:5.1 The steps to conduct a compression test on an internal combustion engine are listed below - NSC Mechanical Technology Automotive - Question 5 - 2021 - Paper 1
Step 1
5.1.1
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Completely open the throttle valve.
Step 2
5.1.2
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Crank the engine until maximum pressure is reached (normally 4 to 10 revolutions); needle stops moving.
Step 3
5.1.3
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Read the pressure that the piston created, off the gauge.
Step 4
5.1.4
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Move on to the next cylinders. Compare the readings of all the cylinders to the manufacturer’s specifications’ readings/Compare readings with each other.
Step 5
5.2.1
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A - Leakage meter / gauge
B - Control valve
C - Flexible hose / pipe / tube
D - Spark plug connector / adaptor
Step 6
5.2.2
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The unit of measure is percentage or %.
Step 7
5.3
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Two components that protect the exhaust gas analyser against soot and moisture are:
Water trap
Paper filter
Step 8
5.4
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The set-up procedure for an on-board diagnostics (OBD) scanner includes:
Plug the on-board diagnostics (OBD) scanner into the connector.
Turn on the ignition but do not start the car.
Enter the vehicle information as required by the scanner.
Select the correct system to scan (diagnostics).
Step 9
5.5.1
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The machine shown in FIGURE 5.5 is a Wheel Balancer.
Step 10
5.5.2
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The function of the wheel balancer is to balance wheels statically and dynamically.
Step 11
5.5.3
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The safety feature that is not present on the machine is the Wheel safety cover / guard / hood.
Step 12
5.6
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The THREE wheel alignment angles that can be measured using the bubble gauge are:
Caster
Camber
King pin inclination (KPI) / steering axis.
Step 13
5.7
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THREE precautions to be taken before the optical wheel alignment equipment is fitted to the wheels are:
Ensure the wheels are in a straight-ahead position.
