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28/11/2014 - Automobile shock absorber inspection and maintenance

In determining the shock absorber has a problem or failure, it should first check whether the damper oil spills or traces of old oil spills. Seal gaskets, coilover kits gasket rupture damaged oil storage cylinder head nut loose.      If it is found leaking, first tighten the cylinder head nut oil, if the damper is still leaking, it may be oil seals, sealing washers failure, should be replaced with new seals. If you still can not eliminate the leak, you should pull out the damping rod, if there was not a time card or severity, further check clearance between the piston and the cylinder is too large, whether the damper piston rod bending, piston rod whether the cylinder surface and scratch or pull marks.      If the damper does not leak phenomenon, should check the damper connecting pins, connecting rods, connecting hole, e36 m3 coilovers rubber bushings and other damage, sealing off, break or fall off place. If these were normal, should be further decomposed damper, check with the gap between the piston and the cylinder is too large, the cylinder without injury, the valve seal is good, valves and valve seat are tight fitting and cut stretching vibration of the spring is too soft or broken, take grinding repair or replacement parts ways depending on the circumstances.     Further, the damper in actual use there will beep failure, car-m.cn mainly due to a damper spring, frame or shaft collision, damage or loss, and damper pads dust barrel distortion, lack of oil and other causes, reasons should be identified, to be repaired.      After the inspection, repair damper should work in a special test rig performance test, when the resistance frequency when 100 ± 1mm, its done stroke stroke and compression resistance should be specified. Liberation CAl091 done as the biggest obstacle to travel 2156 ~ 2646N, the biggest obstacle is the compression stroke 392 ~ 588N; Dongfeng truck done itinerary biggest obstacle for the 2450 ~ 3038N, the biggest obstacle is the compression stroke 490 ~ 686N. If you do not test conditions, we can also use an empirical approach, which uses an iron rod penetrated the lower inner damper rings at both ends with both feet slam, pull both hands back and forth on the rings 2-4 times, when pulled up great resistance, do not feel effortless downward pressure, but compared to some recovery and repair before stretching resistance, no air-way sense, it indicates that the damper normal.
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