Crankshaft And Crankshaft Bearing

WARNING: This page is about a different variant/trim than selected.

Clean the crankshaft completely, and check it for cracks using liquid penetrant tester. If defective, replace the crankshaft.
Check the crankshaft for bend, and repair or replace if needed. If it exceeds the limit, correct or replace it.
NOTE: If a suitable V-block is not available, using the #1 and #7 crankshaft bearings on cylinder block, position the crankshaft on cylinder block. Then, measure the crankshaft bend using a dial gauge.

Crankshaft bend limit:

0.035 mm (0.0014 in)

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

Inspect the crank journal and crank pin for wear. If they are not within the standard, replace the bearing with a suitable (undersize) one, and replace or grind to correct the crankshaft as necessary. When grinding the crank journal or crank pin, finish them to the specified dimensions according to the undersize bearing to be used.

Crank pin:

Out-of-roundness

Limit

0.005 mm (0.0002 in)

Cylindricality

Limit

0.006 mm (0.0002 in)

Grinding limit (dia.)

To 51.734 mm (2.0368 in)

Crank journal:

Out-of-roundness

Limit

0.005 mm (0.0002 in)

Cylindricality

Limit

0.006 mm (0.0002 in)

Grinding limit (dia.)

To 63.742 mm (2.5095 in)

Fig 2: Measuring Crank Journal Cylindricality

Courtesy of SUBARU OF AMERICA, INC.

Unit: mm (in)
		Crank journal diameter			Crank pin outer diameter
		#1, #3, #5	#7	#2, #4, #6	Crank pin outer diameter
Standard	Journal O.D.	63.992 - 64.016 (2.5194 - 2.5203)			51.976 - 52.000 (2.0463 - 2.0472)
Standard	Bearing size (Thickness at center)	1.996 - 2.013 (0.0786 - 0.0793)	1.992 - 2.009 (0.0784 - 0.0791)	1.996 - 2.013 (0.0786 - 0.0793)	1.489 - 1.505 (0.0586 - 0.0593)
0.03 (0.0012) Undersize	Journal O.D.	63.962 - 63.978 (2.5182 - 2.5188)			51.954 - 51.970 (2.0454 - 2.0461)
0.03 (0.0012) Undersize	Bearing size (Thickness at center)	2.011 - 2.014 (0.0792 - 0.0793)	2.011 - 2.014 (0.0792 - 0.0793)	2.015 - 2.018 (0.0793 - 0.0794)	1.507 - 1.515 (0.0593 - 0.0596)
0.05 (0.0020) Undersize	Journal O.D.	63.942 - 63.958 (2.5174 - 2.5180)			51.934 - 51.950 (2.0446 - 2.0453)
0.05 (0.0020) Undersize	Bearing size (Thickness at center)	2.021 - 2.024 (0.0796 - 0.0797)	2.021 - 2.024 (0.0796 - 0.0797)	2.025 - 2.028 (0.0797 - 0.0798)	1.517 - 1.525 (0.0597 - 0.0600)
0.25 (0.0098) Undersize	Journal O.D.	63.742 - 63.758 (2.5095 - 2.5102)			51.734 - 51.750 (2.0368 - 2.0374)
0.25 (0.0098) Undersize	Bearing size (Thickness at center)	2.121 - 2.124 (0.0835 - 0.0836)	2.121 - 2.124 (0.0835 - 0.0836)	2.125 - 2.128 (0.0837 - 0.0838)	1.617 - 1.625 (0.0637 - 0.0640)

Use a thickness gauge to measure the thrust clearance of crankshaft at center bearing. If clearance exceeds the standard, replace the bearing.
Crankshaft thrust clearance:

Standard

0.030 - 0.115 mm (0.0012 - 0.0045 in)

Fig 3: Measuring Thrust Clearance Of Crankshaft At Center Bearing Using Thickness Gauge
Courtesy of SUBARU OF AMERICA, INC.
Inspect individual crankshaft bearings for signs of flaking, seizure, melting and wear.
Measure the oil clearance on each crankshaft bearing using plastigauge. If the measured value is out of standard, replace the defective bearing with an undersize one, and replace or grind to correct the crankshaft as necessary.
Crankshaft oil clearance:

Standard

0.010 - 0.030 mm (0.0004 - 0.0012 in)