Connecting Rod Bearing Selection Table

CONNECTING ROD BEARING SELECTION

		Connecting rod mark
		^	b	c
Crank shaft pin journal mark	^	D (Yellow)	C (Green)	B (None)
	b	C (Green)	B (None)	A (Black)
	c	B (None)	A (Black)	AA (Blue)

3. Check the connecting rods.
1. When reinstalling, make sure that cylinder numbers put on the connecting rod and cap at disassembly match. When a new connecting rod is installed, make sure that the notches for holding the bearing in place are on the same side.
2. Replace the connecting rod if it is damaged on the thrust faces at either end. Also if step wear or a severely rough surface of the inside diameter of the small end is apparent, the rod must be replaced as well.
3. Using a connecting rod aligning tool, check the rod for bend and twist. If the measured value is close to the repair limit, correct the rod by a press. Any connecting rod that has been severely bent or distorted should be replaced.
  Allowable bend of connecting rod: 0.05mm / 100mm (0.0020in / 3.94in ) or less
  
  Allowable twist of connecting rod: 0.1mm / 100mm (0.0039in / 3.94in) or less
4. Check the crankshaft bearing oil clearance.
1. To check main bearing-to-journal oil clearance, remove the main bearing caps and lower bearings.
2. Clean each main journal and lower bearing with a clean shop towel.
3. Place one strip of plastigage across each main journal.
4. Reinstall the lower bearings and caps, then tighten the bolts.
  Tightening torque:
  
  53.9~58.8N.m (5.5~6.0kgf.m, 39.8~43.4lb-ft)
  
  NOTE: Do not turn the crankshaft.
5. Remove the cap and lower bearing again, and measure the widest part of the plastigage.
  Standard oil clearance:
  
  No.1, 2, 4, 5: 0.022~0.040mm (0.0009~0.0016in)
  
  Fig 1: Measuring Widest Part Of Plastigage
  Courtesy of KIA MOTORS AMERICA, INC.
6. If the plastigage measures too wide or too narrow, remove the upper and lower bearing and then install a new bearings with the same color mark. (Refer to , CRANKSHAFT MAIN BEARING SELECTION TABLE )
  Recheck the oil clearance.
  
  CAUTION: Do not file, shim, or scrape the bearings or the cap to adjust clearance.
7. If the plastigage shows the clearance is still incorrect, try the next larger or smaller bearing. (Refer to , CRANKSHAFT MAIN BEARING SELECTION TABLE )
  Recheck the oil clearance.
  
  NOTE: If the proper clearance cannot be obtained by using the appropriate larger or smaller bearings, replace the crankshaft and start over.
  
  CAUTION: If the marks are indecipherable because of an accumulation of dirt and dust, do not scrub them with a wire brush or scraper. Clean them only with solvent or detergent.
  Cylinder block crankshaft journal bore mark location
  
  Letters have been stamped on the end of the block as a mark for the size of each of the 5 main journal bores.
  
  Use them, and the numbers or letters stamped on the crank (marks for main journal size), to choose the correct bearings.
  
  Fig 2: Identifying Cylinder Block Crankshaft Journal Bore Mark Location
  Courtesy of KIA MOTORS AMERICA, INC.