(1) measurement of bearing hole

Measurement of bearing hole diameter can be used to measure check sizes in the micrometer after, also need to measure the bearing hole roundness and cylindricity. Burn bearings often make the bearing hole opening in the reduced diameter and roundness error, the normal work of the bearing is unfavorable for the. If the location surface connecting rod bolts with loose, the connecting rod bearing cap will shift the roundness error. The roundness error of bearing hole should be controlled in size within tolerance, and cylindricity should be strictly controlled.

(2) the main dimensions of the bearing measurements

The thickness of the bearing outside diameter micrometer measuring head: the fixed by the plane into a spherical surface, can be used to measure the thickness of the bearing. The thickness of the bearing should be controlled in the range of 0.005~0.010 mm, otherwise it will make the bearing inside diameter adjustment. Bearing in the near the opening with a trace of thinning, the measurement should be noted.

The bearing and bearing hole compactness: with the tightness is composed of free elastic bearing quantity and residual surface height to ensure. Measurement of residual surface height method: in accordance with the provisions of assembly to bearing, bearing cap bolt tighten to the specified torque after the release of a bolt, the gap with a feeler gauge measurement of bearing cover at the interface, the value should be within the range of 0.05~0.15 mm.

The bearing inner diameter: measurement will be required before shipment with bearing according to the torque required to tighten the bearing cap bolt, with the diameter of scale, measurement of standard size in the micrometer after Colonel, measurement to avoid the thin area. Differential bearing diameter and corresponding shaft diameter size is fit clearance.

The main bearing hole concentricity: main bearing hole concentricity error is the main bearing hole concentricity error caused by reasons, and bearing hole coaxiality error is the cylinder deformation. When the main shaft neck radial runout within the prescribed tolerances, check the main shaft and bearing eat mark, if the main bearings eat mark position is obviously inconsistent, the coaxiality error is large, the scraping, boring bearing or replace cylinder solution, otherwise it is difficult to guarantee the normal work of the engine.