Test the bearing surfaces for scoring and look for normal wear marks, grooves, fatigue and pitting. If a bearing looks abnormal, change it. Make sure you check the connecting rod journals for scoring, nicks and burrs, as incorrectly aligned or bent connecting rods can damage
Pistons, piston rings, cylinder walls, connecting rod bearings and the journals of the crankshaft. Should the wearing of lubricant, bent parts or cracks point to the connecting rod not being aligned correctly, make sure it is and replace any misaligned, bent or twisted rods. Start by removing oil from the connecting rod journal, apply lube to the upper bearing insert and carefully place it in the connecting rod so it is centered. Test out two separate measurements, keeping the result below 0.50 mm (0.0196 in.). Mount Guide Pins Special Tool 8507 on a piston ring compressor to fit the rod and piston assembly into the engine, so the oil slinger slots are in front and the "F"'s on the pistons point that direction too. Put the lower bearing insert into the bearing cap, position it correctly and confirm it doesn't have any grease. Apply a band of Plastigage evenly around the entire central lower insert, without it crumbling; if it is crumbly, new stock should be purchased. Fix the bearing cap and connecting rod to the journal and fasten all bolts to 27 Nm (20 ft. lbs.) plus 90°, but don't rotate the crankshaft at this point to keep the Plastigage clean. After removing the bearing cap, measure the thickness of squashed Plastigage to find the clearance and compare it to the specification for this style of bearing. A change in clearance might mean the journal is tapered, the connecting rod is bent or there is foreign debris stuck between the insert and the cap or rod. Should the replacement part indicate the correct value, just pull the Plastigage from both items and continue with installation. If the bearing-to-journal gap is larger than specified, choose the type of bearing set required, since rod bolts are Torque to Yield and cannot be reused after removal. Measure with Plastigage once again before final assembly to check if the bearing is right. With the suitable insert found, place it and its cap, then screw the connecting rod bolts to a torque of 27 Nm plus a 90° turn. Gently insert the proper-size feeler gauge between the connecting rod and crank journal flange, as described in Engine Specifications and change the connecting rod if the side clearance is unsafe for the engine.