[138-6460-0749] enterprise head machine accessories Shandong Weifang Diesel Engine 6105 Diesel Piston Ring DHC in the lock ring groove is due to carbon deposition produced during combustion caused by oil, and you said piston ring wear is not uniform, and just finished the four matching or a large number of burning oil, should be the quality problem belongs to accessories with the gap, even for four diesel engine matching is also need to measure the piston and the cylinder, do not look at the four supporting components, the assembly factory is not very serious, will also have the gap is too large, and the wall of the cylinder cover processing is very rough, a maintenance worker is not carefully measured, now