How many hours should an overhauled engine idle for break-in?

[VonAlivia]

An overhauled engine requires approximately one hour of idling for break-in. Below are precautions for vehicle break-in after an overhaul: RPM: Engine speed should not be excessively high; it is recommended not to exceed 3,000 RPM. Warm-up: It is advisable to warm up the engine for a period (typically 3-5 minutes) when starting a cold engine, and normal driving can commence once the coolant temperature reaches the normal range. Avoid sudden acceleration or braking: Long-distance driving is not recommended immediately after an overhaul. Avoid sudden acceleration or braking as it can cause significant impact damage to the engine, hinder the break-in of internal components, and result in excessive clearance between parts, thereby affecting long-term service life. Maintain steady speed and shift gears frequently: Try to maintain a steady speed, preferably between 50-80 km/h. Avoid prolonged low-speed driving and shift gears frequently to ensure even break-in of all gears.