After opening the crankcase hatch during a routine inspection, check the condition of the shafts, bearings and oil lines. Note that there is no babbitt near the bearings. For D100 diesel engines, check the “sagging” of the 1st, 2nd, 3rd, 4th, 5th, 6th and 7th main journals of the lower crankshaft through an M2.
Also, at M1, check the “oil” clearance of the main bearings of the D2 diesel engine and all bearings of the D3 diesel engine. In this diesel engine, the divergence of the knee cheek of the sixth cylinder was measured. Large scheduled maintenance provides removal of upper shaft D4 type diesel engine and its main bearings, connecting rod bearings of both shafts, main bearings of 5, 6, 7 and 3 journals of the lower shaft. Measure the wear on the 1st main journal of the upper shaft and the 100th lower shaft. Determines the stepping (“droop”) of the journal’s position on the bracket.
With the M50, all types of diesel engines can check all bearings, measure their thickness, check the shaft, check and measure the wear of the most worn journals using a flaw detector.
At the factory, the repair dimensions of the crankshaft journals differ by 100.4mm. Therefore, the thickness of the bushing also sets a graded dimension, the thickness of which varies with the main body (bronze part), but not with the friction alloy.