What are the basic methods for component inspection?
Measurement of elasticity and torque. A spring tester is used to measure the elasticity of valve springs, fuel injection pumps, speed springs, and piston rings. The principle is to measure the force required to stretch or compress a spring to a length. Check the torque with torque meter was determined, if the cover nut or the connecting rod bolt tightening torque using the torque wrench cylinder size determination.
Measurement of equilibrium inertia. The main component of the balancing inertia on the diesel engine is the crankshaft. Start the engine, the crankshaft rotates with the highest speed, if the crankshaft after disassembly or replacement of a crank crankshaft do static balance test or dynamic balance test and direct the assembly to the diesel engine, diesel engine will produce vibration in high speed rotation, thus affecting the normal operation of diesel engine. Therefore, where the crankshaft is replaced, the balance of inertia must be measured. The crankshaft that has replaced the crank must be measured for balance inertia. The replacement of crank crankshaft can do simple static balance test, the method is: will the new replacement and the crank is not replaced the crank bolt together, then put the rotation on the rail, if a crank down the range always, this part is heavy, should be in the important position of grinding or scraping a few metal to balance.
Inspection of dimension and geometry of parts. The measurement of diesel engine parts selection tool is the inner and outer diameter measuring tools, such as measuring parts with calipers, micrometer, vernier caliper, cylinder table, measuring various gap with the feeler, depth measurement with depth gauge etc.. Measuring parts geometry error, in addition to some tools, but also needs the baifenche and special fixture. Such as the measurement of stepped shaft of each shaft of the cylindricity, roundness, coaxiality and bending degree, to the general axis with the top up or two neck shaped iron frame on "V", then the dialgage detection of each axis in different positions of the neck to neck runout.
Tightness test. Diesel engine block, cylinder head, water tank should be sealed permeability test. Cylinder block and cylinder head are generally tested by water pressure method, and the cracks are checked by checking whether the water is leaking. Water radiators or oil radiators are generally tested by compressed air. The radiator is placed in a container containing water. When compressed air is added, bubbles are not allowed to emerge. The surface of valve cone is more sealed, and it is checked by oil seepage test.
