Engine work, due to the steam valve at high temperatures, valves and other parts due to thermal expansion and elongation, it must be reserved in the cold valve clearance a certain time, to ensure that the expansion valve when the valve is still heated Valve and valve seat can make close cooperation. Due to the valve work for a long time, changed the original valve clearance. So, when you hear the valve has a "rattling" noise, you should check and adjust the valve clearance. When adjusting the valve clearance, it must be adjusted according to the value specified by the manufacturer, and the valve should be fully closed. Adjust the valve clearance position: side-mounted engine on the tappet, overhead engine on the rocker. Common valve adjustment methods are: cylinder adjustment method, the second adjustment method, expression method. However, due to a wide range of engines, the order of intake and exhaust valves varies. With the above method to adjust the valve clearance, there is inconvenience to memory and complicated feeling. And if you do not know the firing order of the engine (or injection sequence), the adjustment will be more troublesome. Now introduced for two different ways to adjust the valve clearance methods and techniques. Known ignition sequence valve clearance adjustment 1. A simple way to determine 1 compression top dead center If you know the engine's firing order (or injection sequence), adjust the valve clearance, you should first accurately locate the 1-cylinder or 6-cylinder compression TDC position. Now determine 1 or 6 cylinder compression top dead center method is more complicated and very troublesome to operate (that is, remove the first cylinder spark plugs, with a thumb or cotton gauze plug the first cylinder spark plug hole, and then hand crank shakes Crankshaft.When the thumb felt pressure or cotton yarn group "å˜" to jump out, it is the first cylinder compression top dead center position). Now based on the author's experience in the maintenance of a simple and practical method: the use of 1,6-cylinder (4-cylinder) piston on the same plane, 1 cylinder compression end, 6 or 4 cylinder valve to open this rule to determine. That is, when 1 cylinder compression top dead center, 6 cylinder (4 cylinder) exhaust valve close to close, the intake valve just on top, the exhaust valve is not good to grasp the intake valve on the top for easy observation, as long as the intake valve top Slightly upward bar, 1 cylinder compression top dead center position. Similarly, when 1 cylinder intake valve push rod fretting, 6 cylinder (4 cylinder) that is in compression top dead center position. 2. Determine the adjustable valve skills The following work order for the 1-5-3-6-2-4 6-cylinder engine as an example of its simple adjustment methods and formulas. When it is determined that the engine 1 cylinder is in compression TDC, the 1-cylinder 2-valve is fully tuned, and the 5,3-cylinder is adjustable at the beginning of compression and intake, while the 2-exhaust valve is adjustable. 6 cylinder in the intake staggered state, are not adjustable. 2,4 cylinder exhaust and work at the end, 2 intake valve adjustable. After adjustment, then turn the crankshaft 360 °, you can adjust all the remaining valves. Can be grouped into formulas: full tune row, not transferred. Can also be summarized as follows: take the first cylinder, go to the middle, before the transfer, after the transfer, three hundred sixty-six, the remaining tanks, in turn. Namely: 6 before the cylinder into the valve, 6 cylinder after the cylinder into the valve. If the 6-cylinder compression at the top dead center (6-2-4-1-5-3), the reasoning method is the same, starting from the 6-cylinder, but also the whole row, not transferred. That is, the cylinder before 1 cylinder into the valve, 1 cylinder after the cylinder into the valve. This method can also be used for 4-cylinder and multi-cylinder engines, with a work order of 1-3-4-2 as an example of a 4-cylinder engine: The formulas are still full-throttle and are not adjusted. That is, 4 cylinder before the cylinder into the valve, 4 cylinder after the cylinder into the valve. 4 cylinder into the exhaust valve are not transferred. The above reasoning shows that as long as we remember "formulas", knowing the order of the work of the engine can easily determine the adjustable valve. Valve Latch Adjustment for Unknown Ignition Sequence Sometimes we do not know the firing sequence (or sequence of injection) when we are servicing some cars. How to check and adjust the valve clearance it? Here are 2 ways to adjust the valve and skills. Method 1: Inline 4-stroke cylinder, the number of its cylinder divided into two, with the middle axis of symmetry, so that the number of cylinders on both sides equal. Two people with one cranked crankshaft. When you want to check the adjustment of a cylinder valve clearance to the right of the symmetry axis, just pay attention to see the left side of the symmetry axis corresponding to the cylinder intake valve. When the valve slightly, you can check the adjustment of the right side of the cylinder valve clearance. 6-cylinder in-line engine, if you want to check the adjustment of the 5th cylinder into the exhaust valve clearance, then see the second cylinder intake valve slightly, the fifth cylinder is in compression end of the top deadline, then check and adjust The two valves of the cylinder. For the V-type engine, it can be considered as two in-line with each other to analyze, respectively, to check the adjustment, the same way. From the engine crankshaft connecting rod journal to analyze, this method is correct. Because the axis of symmetry around the connecting rod journal is symmetrical. When the 5th cylinder in the compression top dead center, the second cylinder just in exhaust top dead center. As the intake and exhaust have Diego angle, so the cylinder intake valve has just opened. Method 2: When one valve in a cylinder is in the maximum open position (when the side-mounted gas distribution mechanism can be observed from the valve cover, that is, when the tip portion of the cam faces the insert rod, the top-mounted gas distribution mechanism can observe the valve rocker arm , Its end down to open the valve when the lowest position), then you can check to adjust the cylinder's another valve clearance. According to this by cylinder one by one, you can adjust the cylinder valve of all the valve clearance is completed. The feasibility of this method can be verified from the structure of the camshaft, because the same cylinder crooked angle of different name of the cam is 90 °, that is, the same cylinder 1 valve is in the maximum open state, the other valve must be Is closed, and the base circle of the cam is facing the tappet, and the condition for adjusting the valve clearance is provided.
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