How to adjust the valve clearance of four-cylinder diesel engine

Pacific Auto Network takes a four-cylinder engine with the ignition sequence of 1-3-4-2 as an example. 1 cylinder has: 1 cylinder at top dead center of compression stroke? Are all the entrances and exits closed? (compression top dead center), 3 cylinders? Paguan, get in and get out? (intake bottom dead center), 4 cylinders? Inside and out? (Exhaust TDC), cylinder 2? Queue up to enter the customs? (Working top dead center) When the fourth cylinder is located at the top dead center of the compression stroke, the working conditions of each cylinder can be obtained by analogy, and adjustments can be made accordingly.

When the engine is working, the valve will expand due to the increase of temperature. If there is no gap between the valve and its transmission parts in the cold state or the gap is too small, then the thermal expansion of the valve and its transmission parts in the hot state will inevitably lead to the untidy closing of the valve, resulting in air leakage in the compression stroke and power stroke of the engine, thus reducing the power and even making it difficult to start. In order to eliminate this phenomenon, when the engine is assembled in cold state, a certain gap is usually left in the valve and its transmission mechanism to compensate for the expansion of the valve after heating. This clearance is called valve clearance.

4-cylinder valve clearance adjustment method and formula: When adjusting the valve clearance of a 4-cylinder or 6-cylinder engine, the valve adjustment sequence is related to the working sequence of the engine and the position of the intake and exhaust valves, and the valve adjustment sequence of different engines is often different, so the maladjustment often occurs due to memory. In order to find a simple and easy-to-remember method, we combined teaching and production practice to summarize a set of methods for using four-stroke engines. Double platoon, no, forward? Four-character formula

(Photo/Text/Photo: Pacific Auto Network Q&A called Beast)