Genuine Mazda B2000 Rod Bearing

Mazda B2000 Rod Bearing Parts and Q&A

• Bearing
  3975-23-105A
  Q: What procedure should be followed after removing the rod bearing along with the connecting rod and piston assemblies on Mazda B2000?

  A:

  In case the connecting rod and piston assemblies have been already taken off out of the engine, follow the following process. The connecting rod bearings have a design that makes them slightly project the face of the rod and piston caps to have the positive contact and can be replaced without the removal of the rod and piston assemblies. Stamp the number of the cylinder on the machined parts of the connecting rod and cap with the bottommost journal connecting rod, then take the caps off. Check the journals against roughness and wear; the slight roughness can be smoothed using a fine grit polishing cloth soaked in engine oil, and burrs can be removed using a fine oil stone, and the stone should move around the circumference of the journal, and not back and forth. In case the journals are rated or stippled, then the crankshaft should be changed. Measure the journals of the connecting rod with a micrometer, and check out of roundness and proper size. All crankshaft rod journals will be of standard size but where undersized bearings are being utilized these will be 0.25mm undersized and marked by a stamp on the number 4 counterweight. Plastic gauging material is used by wiping the journal bearing cap, connecting rod and the outer and inner surface of the bearing inserts clean and making sure that the insert tang fits into the notch on the rod and cap. Introduce a strip of plastic gauging material in the center of the lower bearing shell, then clear the bearing cap, and measure the bearing clearances with the help of the width of the flattened plastic gauging material in its maximum width against the graduation on the container, which denotes the clearance, in thousandths of an inch or millimeters. In case the clearance is too much, change the bearing and re-inspect the clearance. There are undersized bearings in 0.25mm, 0.50mm, and 0.75mm. Before installing the bearing, lubricate the bearing with engine oil, and the same should be repeated with the rest of the connecting rod bearings to ensure that all the rods are hooked to their journals when turning the crankshaft without damaging the engine.