TUNE UP ENGINE KONVENSIONAL | UJI KOMPETENSI | SMK BINA TARUNA PURWAKARTA

Summary

This video script provides a comprehensive guide for conducting a competency test in vehicle maintenance. It covers a wide range of checks, including engine oil, battery voltage, coolant system, air and fuel filters, coil cables, spark plug gaps, valve clearance, and compression. Each section explains the tools and methods used for inspection, as well as how to record the results in a job sheet. The script emphasizes both visual inspections and the use of specialized equipment, ensuring that learners can accurately assess vehicle conditions and maintain safety throughout the process.

Takeaways

• 😀 Check engine oil by using the dipstick, wipe with a cloth, reinsert, and check for full or low levels.
• 😀 Battery inspection should be visual, and voltage should be measured with a digital voltmeter set to DC 20, where 12V is ideal.
• 😀 Electrolyte density in the battery is checked with a hydrometer; green indicates good, while red means a refill is needed.
• 😀 Radiator system pressure is tested using a radiator cap tester; if pressure drops, it indicates a leak.
• 😀 Belt tightness (for the drive belt or radiator fan) is checked by hand pressure; if loose, adjust accordingly.
• 😀 Air filter condition is visually inspected; if dirty, it should be noted, and if clean, it's good.
• 😀 Fuel filter should be checked for cleanliness, though it may not always be installed during testing.
• 😀 Coil cable and spark plug wire resistance is tested using a multimeter set to 20K, ensuring proper conductivity.
• 😀 Spark plug gap is measured with a feeler gauge, with a standard gap of 0.80mm; adjust if too tight or loose.
• 😀 Valve clearance should be checked with a feeler gauge; intake valves typically use 0.20mm, and exhaust valves use 0.30mm.
• 😀 Compression testing is done by removing spark plugs, installing a compression gauge, and measuring pressure in each cylinder.

Q & A

What is the first step in checking the engine oil in the script?

The first step is to use a rag to wipe the dipstick clean, then reinsert it into the engine to check the oil level, which will indicate if it is full or low.

What is the purpose of using a hydrometer during the inspection?

The hydrometer is used to check the specific gravity of the battery electrolyte, which helps determine the condition of the battery fluid (whether it is good, normal, or needs replacing).

What should you do if the battery voltage reading is lower than expected?

If the battery voltage is lower than the expected 12 volts, it may indicate that the battery is in poor condition, but the tool being used may be slightly inaccurate (the script mentions the reading can be about 11 volts).

What does a drop in pressure when using the radiator cup tester indicate?

A drop in pressure indicates a possible radiator leak. If the pressure holds steady at the set value (10), the radiator is in good condition.

How do you check the tension of a drive belt or radiator fan?

The tension of the drive belt or radiator fan can be checked by simply pressing on the belt with a finger. If it feels loose, it needs to be tightened.

What is the correct way to inspect the air filter?

The air filter is visually inspected. If it's dirty, it should be noted as 'dirty'; if it's clean, it should be noted as 'good'.

How do you measure the resistance of the spark plug wire?

To measure the resistance, you disconnect the spark plug wire and use a multimeter set to measure resistance (20k setting), then record the reading.

What should you do if the spark plug gap is too wide or too tight?

If the spark plug gap is too wide, you can gently adjust it by pressing it down, and if it's too tight, you can carefully widen the gap using a tool like a feeler gauge.

Why is it important to ensure that the piston is at the top of the compression stroke when adjusting the valve clearance?

It is important to position the piston at the top of the compression stroke to ensure that the valves are properly adjusted when they are in the correct position relative to the camshaft.

What is the purpose of the compression test, and how is it performed?

The compression test is used to check the condition of the engine's cylinders. It is performed by removing the spark plugs, attaching a compression gauge, and cranking the engine to check the pressure reading for each cylinder.