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What are the consequences of not tightening the oil drain plug?

1 Answers

McBethany

07/30/25 5:55am

The oil drain plug not being tightened can lead to engine oil leakage. When the internal engine oil level falls below the lower limit of the dipstick, it can cause "dry grinding" issues in the engine's thermal components. This may eventually result in sintering and severe wear due to localized overheating. The main components affected include the crankshaft, camshaft, valve rocker arm, cylinder, piston, and bearings. In severe cases, it can lead to the complete scrapping of the engine. Below is relevant information: 1. Engine block: The block serves as the skeleton of the engine and the installation base for all its mechanisms and systems. It houses all the main components and accessories of the engine, both internally and externally, and bears various loads. Therefore, the block must have sufficient strength and rigidity. The block assembly mainly consists of the cylinder block, cylinder liner, cylinder head, and cylinder gasket. 2. Common causes of faults: Malfunctioning throttle position sensor, excessive fuel pressure, leaking cold start injector or faulty cold start control, leaking fuel injector, failed oxygen sensor, and ignition system failure.

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