НИЗКАЯ КОМПРЕССИЯ: сервис приговорил мотор на 120 000 ₽ — повторный тест раскрыл обман

LOW COMPRESSION: The service center sentenced the engine to 120,000 rubles — a repeat test revealed the deception. The service center measured the compression, saw a low reading in one cylinder, and immediately sentenced the engine to a major overhaul for 120,000 rubles. The verdict was dire: the piston rings were worn, the engine would soon start consuming oil, lose power, and finally fail. But before disassembling the engine, I decided to repeat the diagnostics myself. A repeat compression test, oil test, and leak check revealed that the piston rings were intact, and the real cause was hidden in the valve train. The service center wanted 120,000 rubles. The actual cost to fix the problem was about 3,000 rubles. Savings: 117,000 rubles. In this episode, we'll explore: — why the engine starts misfiring; — What does low compression in one cylinder mean? — Is it possible to immediately wear piston rings? — How to measure compression correctly? — Why measuring on a cold engine can be misleading? — Why you should fully open the throttle; — How battery condition affects the results; — What does an oil test show? — How to distinguish ring wear from valve problems; — Why perform a cylinder leak test; — When an overhaul is truly necessary; — How to check a service center's diagnosis before disassembling the engine. Important: Normal compression values ​​and acceptable differences between cylinders depend on the specific engine. Refer to the vehicle's technical documentation, not generic figures from the internet. Don't disassemble the engine based solely on a single, incorrect measurement. Low compression is a test result, not a definitive diagnosis. Subscribe to "Garage Mechanic" — here we break down auto repair shop horror stories with facts and inspect your car before paying for expensive repairs. Let us know in the comments: have you ever been told your engine needs a major overhaul? What was the real cause? #compression #enginerepair #garagemechanic