What are the operation steps for cylinder measurement?
3 Answers
Position the dial face towards the hook point of the measuring rod for easy observation, ensuring the short needle of the dial has a compression of 1-2mm according to the cylinder diameter. Adjust the micrometer to the standard size of the cylinder being measured, then calibrate the cylinder gauge to the micrometer's size. Measure the wear at the middle and lower parts of the cylinder using the same method. The middle part of the cylinder refers to the midpoint between the top and bottom dead centers.
I've been repairing cars for decades and measuring cylinder bores is a routine task that must be done step by step for accuracy. First, remove the cylinder head and spark plugs, then thoroughly clean the oil stains and carbon deposits from the cylinder walls to prevent measurement errors. Next, take out the bore gauge and calibrate it to zero; otherwise, the readings will be off. Measurements should be taken at three positions: the top (near the piston), the middle, and the bottom (near the crankshaft), with each position measured three times and the average recorded. If the wear exceeds 0.05mm, it's usually time to consider replacing the cylinder liner. Don't rush to reassemble—check the cylinder walls for scratches and ensure overall smoothness. I always remind car owners to perform regular maintenance, as high temperatures and lack of engine oil can accelerate wear. Measuring cylinder bores may seem simple, but precision lies in the details—there's no room for carelessness.
When I first started as an apprentice in the auto repair shop, learning cylinder measurement was really tough. The boss taught me to first disassemble related parts and clean them thoroughly, ensuring no dirt remained on the bore walls. Then, using a cylinder gauge, measure at the top, middle, and bottom points of the bore three times each, recording the data clearly. My common mistakes were inaccurate positioning or difficulty reading the measurements, but it improved after I started using specialized recording sheets. If uneven wear is detected, it might indicate engine misalignment leading to increased fuel consumption. Safety first—always wear protective gloves and goggles. Performing this inspection regularly can prevent major repair costs and save a lot of money. With more practice, you'll get the hang of it. The key is to keep practicing and not be afraid of making mistakes.
