Bearing specifications are 4: 0.25mm, 0.somm, 0.75mm and 1.oomm.
Replacement of bearings, the bearings must be matching, the matching of technical requirements are as follows: (l) selection based on journal bearings. According to the crankshaft grinding size, use the same level of the bearing.
(2) Bearing length requirements. Install the new bearing seat hole, down two on each side above the bearing surface should be 0.03 ~ 0.05mm. To ensure that the bearing and seat hole close fit, enhance the cooling effect.
Check the bearing length of thumb is: the bearings installed. Fitted bearing cap, the required end of the bolt tightening torque values, on the other end cap bearing surface with a thickness of 0.05mm between beating one gasket, when the screw to reach the end of the bolt torque 10 ~ 20N · m, such as pad film can not spare, indicating the length of the right side of the bearing pads can be out of the mouth, indicating the bearing length is too long, should be no sudden Zen positioned low end of file; screw to the specified torque value without a gasket on the spare, shows off the bearing short, should be re-matching.
(3) The back of the Zen smooth sudden good. Should have no bearing on the back spots, surface roughness Ra of 0.8μm, sudden Zen prevent bearing rotation, from the positioning effect, such as sudden Zen is too low, can be pointed out the ideal height of milling, such as sudden Zen damaged bearings should be re-elected.
(4) no sound appropriate flexibility. The new release bearing housing bearing, require bearing housing bore radius of curvature greater than the radius of curvature, when the bearing seat hole mounted, by means of bearings and bearing its own stretch the hole tightly, in order to facilitate heat dissipation. Check whether the hoarse voice bearing, the bearing can hit the back check to listen, with a hoarse voice instructions alloy plate with strong, should be re-matching.
(5) With the gap between the bearing and the journal should be appropriate. Optional bearings, they must be checked with the gap. Inspection, the amount of cylinder table and micrometer measurements and journal bearings, the difference is with the gap. Experience with the bearing clearance check is: For the connecting rod bearings, bearing a thin layer of oil, will be installed in the corresponding connecting rod journal on the required torque the bolts, then hand swinging rod, can turn 1 1 / 2 laps, pulled along the axis connecting rod, no space feeling. That meet the requirements; for the main bearing journal and the bearing in the road surface coated with oil, installed the required crankshaft torque bolts to the crank with both hands pulled to rotate the crankshaft to 1 / 2 circle, and turn the light, even no blocking phenomenon for the right
(6) to be loaded into the housing bore coaxial. Centerline of the road should be the main bearings in the same axis. Check the check is in the main bearing gap, remove the main bearing caps, crank lift next to see the road bearing contact area should be consistent with each other, such as exposure is inconsistent, but the difference is not significant, can be repair scratch; such as difference is too large, or a non-contact bearing piece, another piece of heavy exposure, should re-examine the main bearing bore concentricity or re-matching bearings



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