Crankshaft And Crankshaft Bearing

WARNING: This page is about a different car, the 2012 Subaru Forester. However, it is still accessible from the selected car via links, so may be relevant.

Clean the crankshaft completely, and check it for cracks using liquid penetrant tester.
Using a dial gauge, check the crankshaft bend. If it exceeds the limit, grind to correct or replace the crankshaft.
NOTE:
- If a suitable V-block is not available, using just the #1 and #5 crankshaft bearings on cylinder block, position the crankshaft on cylinder block. Then, measure the crankshaft bend using a dial gauge.
- Measurement should be performed at a temperature of 20°C (68°F).
- When grinding to correct the crankshaft, refer to step 3).
Crankshaft bend limit: 0.035 mm (0.0014 in)

Fig 1: Checking Crankshaft Bend Using Dial Gauge
Courtesy of SUBARU OF AMERICA, INC.

Using micrometer, check the outer diameter of crank journal and crank pin, cylindrically, out-of-round-ness. If it is not within the standard, replace the connecting rod bearing or crankshaft bearing, and grind to correct or replace the crankshaft as required.

Measurement should be performed at a temperature of 20°C (68°F).
Select the suitable size connecting rod bearing or crankshaft bearing when replacing the connecting rod bearing or crankshaft bearing.
When grinding to correct the crank journal or crank pin, finish them to the suitable dimensions as shown in the table below according to the undersize bearing to be used.

CRANKSHAFT AND CRANKSHAFT BEARING SPECIFICATION CHART

Unit: mm (in)
		Crank journal diameter		Crank pin outer diameter
		#1,#2, #3, #4	#5	Crank pin outer diameter
Standard	Journal O.D.	67.985 - 68.009 (2.6766 - 2.6775)	67.985 - 68.009 (2.6766 - 2.6775)	47.976 - 48.000 (1.8888 - 1.8898)
Standard	Bearing size (Thickness at center)	2.495 - 2.513 (0.0982 - 0.0989)	2.493 - 2.511 (0.0981 - 0.0989)	1.492 - 1.508 (0.0587 - 0.0594)
0.03 (0.0012) Undersize	Journal O.D.	67.955 - 67.979 (2.6754 - 2.6763)	67.955 - 67.979 (2.6754 - 2.6763)	47.946 - 47.970 (1.8876 - 1.8886)
0.03 (0.0012) Undersize	Bearing size (Thickness at center)	2.519 - 2.522 (0.0992 - 0.0993)	2.517 - 2.520 (0.0991 - 0.0992)	1.511 - 1.515 (0.0595 - 0.0596)
0.05 (0.0020) Undersize	Journal O.D.	67.935 - 67.959 (2.6746 - 2.6755)	67.935 - 67.959 (2.6746 - 2.6755)	47.926 - 47.950 (1.8868 - 1.8878)
0.05 (0.0020) Undersize	Bearing size (Thickness at center)	2.529 - 2.532 (0.0996 - 0.0997)	2.527 - 2.530 (0.0995 - 0.0996)	1.521 - 1.525 (0.0599 - 0.0600)
0.25 (0.0098) Undersize	Journal O.D.	67.735 - 67.759 (2.6667 - 2.6677)	67.735 - 67.759 (2.6667 - 2.6677)	47.726 - 47.750 (1.8790 - 1.8799)
0.25 (0.0098) Undersize	Bearing size (Thickness at center)	2.629 - 2.632 (0.1035 - 0.1036)	2.627 - 2.630 (0.1034 - 0.1035)	1.621 - 1.625 (0.0638 - 0.0640)

Crank pin and crank journal:

Out-of-roundness

Standard

0.005 mm (0.0002 in)

Cylindrically

Standard

0.006 mm (0.0002 in)

Grinding limit (dia.)

Crank pin: To 47.726 mm (1.8790 in)

Crank journal: To 67.735 mm (2.6667 in)

Fig 2: Checking Outer Diameter Of Crank Journal And Crank Pin, Cylindrically And Out-Of-Round-Ness Using Micrometer

Courtesy of SUBARU OF AMERICA, INC.

Inspect the crankshaft bearing for scar, peeling, seizure, melting or wear, etc.
Use a thickness gauge to check the thrust clearance of crankshaft at #5 crankshaft bearing. If it is not within the standard, replace the #5 crankshaft bearing.
- Measurement should be performed at a temperature of 20°C (68°F).
- Select the suitable size by referring to step 3) when replacing #5 crankshaft bearing.
  Crankshaft thrust clearance:
  
  Standard
  
  0.130 - 0.308 mm (0.00512 - 0.01213 in)
  
  Fig 3: Checking Thrust Clearance Of Crankshaft At #5 Crankshaft Bearing Using Thickness Gauge
  Courtesy of SUBARU OF AMERICA, INC.
Check the oil clearance on each crankshaft bearing using plastigage. If it is not within the standard, replace the crankshaft bearing, and grind to correct or replace the crankshaft as required.
- Measurement should be performed at a temperature of 20°C (68°F).
- Select the suitable size by referring to step 3) when replacing crankshaft bearing.
- When grinding to correct the crank journal, finish it to the suitable dimensions by referring to step 3) according to the undersize bearing to be used.
  Crankshaft oil clearance:
  
  Standard
  
  0.013 - 0.031 mm (0.00051 - 0.00122 in)