How to Adjust Valve Clearance of 465 Engine
Introduction of engine valve clearance;
1. First, loosen the fixing nut of the valve adjusting screw, insert the plug gauge with a specified thickness into the valve gap, pull the plug gauge with one hand and turn the adjusting screw with the other hand until the plug gauge receives slight resistance. After correct adjustment, insert the plug gauge into the center of the valve clearance, keep the adjusting screw still, and tighten the fixing nut to lock the adjusting screw. After locking the screw, re-measure the valve clearance with a plug gauge, because you may have inadvertently moved the adjusting screw during locking, thus changing the valve clearance. If the valve clearance changes, it should be readjusted until it is correct. Twice adjustment method. According to the structural principle of valve train, we know that the arrangement of intake valve and exhaust valve is regular. ; According to the ignition sequence and the arrangement sequence of intake and exhaust valves, the clearance of four (four-cylinder engine) or six (six-cylinder engine) valves can be checked and adjusted; Then turn the crankshaft once so that four or six cylinders are at the compression top dead center position, and then adjust the other four or five or six valves. Cylinder by cylinder adjustment method. Because the order of engine valves is different, it is difficult to remember the order of intake valves and exhaust valves.
2. Two-time adjustment method: Take a six-cylinder engine working in 1, 5, 3, 6, 2 and 4 ignition sequence as an example, which is explained as follows: ① First, put the piston of a cylinder at the compression end, then the intake and exhaust valves of this cylinder will be adjustable;
(2) According to the principle of "two in three rows". That is, the intake valve of the second cylinder and the exhaust valve of the third cylinder must be completely closed at this time, and the adjustment can also be checked;
(3) Only one pair of valves can be adjusted at a time for two cylinders with connecting rod shaft diameters in the same plane, so the exhaust valves of five cylinders and the intake valves of four cylinders can also be checked and adjusted;
(4) When the six-cylinder piston is at the end of compression, the remaining valves that have not been checked and adjusted must be completely closed;
3. Loosen the lock nut 2 of the adjusting screw 1 and turn the adjusting screw with a screwdriver to make the gap a between the lower end face of the screw and the upper end face of the valve stem 3 reach the specified value (determined by the thickness of the thickness gauge). Keep the screwdriver still, tighten the lock nut to the specified torque, and then insert the thickness gauge into the gap A for re-inspection so that the gap between the intake valve and the exhaust valve of the first cylinder can be adjusted. Then turn the crankshaft clockwise (as viewed from the front of the engine). For a 4-cylinder engine, the valve clearance of the next ignition cylinder can be adjusted in the order of 1-3-4-2 every time it rotates 180. For a 3-cylinder engine, it can be adjusted according to the ignition sequence of 1-2-3 every 240 (the rotation angle of crankshaft can be converted by the number of teeth of flywheel ring gear).
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