crankshaft (bearing) diagnosis assembly and maintenance toolbox each functional description:
1 diameter micrometer: detection roundness and taper of connecting shaft neck; 
2 feeler gauge: detection middle of crankshaft enframing holes ,Detection  clearance of piston ring and crankshaft ,
3 the crankshaft coaxial meter: detection of crankshaft straightness and concentricity,
4 plastic wire gage: detection crankshaft and bearing bush between gap,
5. Anaerobic adhesive, prevent nut become flexible of connecting rod cap,
6  Piston Ring compressed tools: replace piston rings, handling the pistons,
7. Bearing scraper：reject arrises ridge of Bearing scraper,
8. The stethoscope: detection of crankshaft and bearing noise, piston and cylinder test of noise,