1.1 crankshaft repair should be carried out before the inspection, there shall be no crack. But the journal along the oil hole surrounded by a shallow crack length does not exceed 5mm or does not extend to the longitudinal crack journal fillet and oil hole (shaft neck length is less than or equal to 40mm, the crack length is less than 10mm; the shaft neck length greater than 40mm, crack length is less than 15mm), are still allowed to repair.
1.2 crankshaft bearing journal wear, should according to the list of crankshaft grading 1 repair size repair. Combined crankshaft bearing journal wear more than limit, sliding bearing neck more than the allowable limit size, allowing compensation repair, restore to the original design of a size.
Note:
Limit deviations of various repair size still uses the original design dimensions.
The 9 level and 9 level is not commonly used size class.
The classification of crankshaft special provisions, should according to its original design implementation.
1.3 compensation repairing shaft neck, can use wire spraying, electric vibration welding, plating, chrome plating and other methods. Other parts wear more than limit, according to the situation, in addition to the above methods can be used, also can use manual arc welding repair method of recovery. Repairing layer should be uniform and appropriate mechanical properties, to meet the use requirements, see Appendix A (reference).
1.4 crankshaft grinding, the same journal must repair size for the same.
1.5 crankshaft main journal and connecting rod journal surface wear more than limit, the shaft neck width provisions shall be restored to the original design..
1.6 crankshaft repair, with both ends of main shaft neck common axis as the benchmark:
The radial A. intermediate shaft neck circular runout tolerance is 0.05mm.
Parallelism tolerance B. each crankpin axis to the axis of main shaft neck: one-piece crankshaft is phi 0.0lmm, Phi 0.03mm combined crankshaft.