Standard Procedure - Crankshaft Main Bearing Fitting

WARNING: This page is about a different car, the 2005 Dodge Stratus and 2005 Chrysler Sebring. However, it is still accessible from the selected car via links, so may be relevant.

The main bearings are "select fit" to achieve proper oil clearances. For main bearing selection, the block and crankshaft have grade identification marks.

The grade marks for the cylinder block main bearing bore grade is located on the pan rail just below the left side engine mount bracket. See Fig 2. These marks are read left to right, corresponding to main bore 1, 2, 3, 4.

The grade marks for the crankshaft are located on the rearmost crankshaft counter weight as shown in Fig 1. The crankshaft journal grade marks are read left to right, corresponding with journal number 1, 2, 3, 4.

Refer to MAIN BEARING SELECTION CHART-2.7L . to properly select the main bearings. For an example, if the main bore grade is 3 and the journal grade is 2, the proper select fit bearing would be (2) +0.003 mm (+0.0002 in.).

NOTE: Service main bearings have a number from 1-5 marked in ink on the bearing surface. See Fig 3. For verification, use MAIN BEARING SELECTION CHART-2.7L . for number to size identification.

The upper main bearing has a oil feed hole and a center groove to allow lubrication of the main journal and must be properly positioned in the block.

NOTE: Although cylinder bores are graded for size, there is only one piston size.

Fig 1: Crankshaft Main Journal Grade Marking Location

Courtesy of DAIMLERCHRYSLER CORP.

Fig 2: Cylinder Block Main Bore Grade Marking

Courtesy of DAIMLERCHRYSLER CORP.

Fig 3: Main Bearing Grade Marks

Courtesy of DAIMLERCHRYSLER CORP.

1 - LOWER MAIN BEARING

2 - UPPER MAIN BEARING

3 - OIL FEED HOLE AND GROOVE

4 - GRADE SELECTION INK MARKS

MAIN BEARING SELECTION CHART-2.7L

-	-	Main Bearing Bore Grade Mark
-	-	1	2	3
Crankshaft Main Journal Grade Mark	1	(3) standard	(2) +0.003 mm (+0.0002 in.)	(1) +0.006 mm (+0.0003 in.)
	2	(4) -0.003 mm (-0.0002)	(3) standard	(2) +0.003 mm (+0.0002 in.)
	3	(5) -0.006 mm (-0.0003 in.)	(4) -0.003 mm (-0.0002 in.)	(3) standard