Monday, May 27, 2013
Repair 402 engines with their own hands
Engine 402 is a major challenge. At the time this engine was a good, reliable enough and sort of topical. Confirms is that it exploited for many years. Construction of this engine is more than fifty years ago. On the positive side are that he stoically endures overload, quite correctly implemented, and it's very easy to repair, even on its own. One of the biggest drawbacks 402 engine is the fact that after 1986, their quality has deteriorated. As the old factories still use centerless grinding, it is accompanied by the fact that the radical axis and the axis of the crankshaft bearing is not the same. Even the rather poorly balanced crankshafts, which can lead not only to strong vibration, but even in failure of the engine. Another drawback is the rear seal replaced gasket scraper. But despite all these drawbacks and defects, 402 th engine continues to operate safely and with the application a minimum of effort - a long time. Consider a situation that you need to adjust thermal gaps. To do this, do such actions. Initially, we remove the carburetor, but until then disconnect the carburetor fuel supply tube and pipe air filter. After this, unplugging the drain and force the tube, remove the filter to clean the oil. Remove the exhaust and intake pipes. Drain pipe fine filter oil disconnects the valve box lid. Then open the valve on the box cover, but very cautiously, that would not damage the cork. Then it is necessary first cylinder piston, using starting handle the engine's crankshaft, to bring to its highest position during the compression stroke. Now, adjusting the gap: releasing the lock nut adjusting screw with the key, then holds the plunger from rotating, check the flat probe gap and at the same time, rotate the adjustment screw, you hold the pusher, until we obtain the necessary clearance. Further delaying the lock nut and check the gap again. Adjust the first, second, third and fifth valves, but the crankshaft is not cranking. Crankshaft to rotate it one turn, until a shift marks on the flywheel. Adjust the fourth and eighth final, sixth and seventh intake valves and the valve system of the thermal gap. After some time in the engine, specifically the valve mechanism, there may be a knock. Eliminate it by adjusting the thermal gap is impossible. Knocking is caused by increased axial clearance exhaust valve rocker arm, because they do not have the spacer springs that automatically eliminate the gaps. They can be eliminated by setting the puck between the spacers and rockers on the shaft. To do this, you can use shims. If they do not fit in thickness, they can be fit with a file or grinding wheel.
No comments:
Post a Comment