Crankshaft And Crankshaft Bearing

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

Clean crankshaft completely and check for cracks by means of red lead check etc., and replace if defective.
Measure the crankshaft bend, and correct or replace if it exceeds the limit.
NOTE: If a suitable V-block is not available, install #1 and #5 crankshaft bearing on cylinder block, position crankshaft on these bearings and measure crankshaft bend using a dial gauge.

Crankshaft bend limit: 0.035 mm (0.0014 in)

Fig 1: Measuring Crankshaft Bend
Courtesy of SUBARU OF AMERICA, INC.

Inspect the crank journal and crank pin for wear. If they are not within the specifications, replace bearing with a suitable (undersize) one, and replace or recondition crankshaft as necessary.

When grinding crank journal or crank pin, finish them to the specified dimensions according to the undersize bearing to be used.

Crank pin:

Out-of-roundness

0.003 mm (0.0001 in)

Cylindricality

0.004 mm (0.0002 in)

Grinding limit

51.750 mm (2.0374 in) dia. or less

Crank journal:

Out-of-roundness

0.005 mm (0.0002 in)

Cylindricality

0.006 mm (0.0002 in)

Grinding limit

59.750 mm (2.3524 in) dia. or less

Fig 2: Inspecting Crank Journal And Crank Pin

Courtesy of SUBARU OF AMERICA, INC.

JOURNAL CHART AND CRANK PIN

Unit: mm (in)
		Crank journal diameter		Crank pin diameter
		#1, #3	#2, #4, #5	Crank pin diameter
Standard	Journal O.D.	59.992 - 60.008 (2.3619 - 2.3625)	59.992 - 60.008 (2.3619 - 2.3625)	51.984 - 52.000 (2.0466 - 2.0472)
Standard	Bearing size (Thickness at center)	1.998 - 2.011 (0.0787 - 0.0792)	2.000 - 2.013 (0.0787 - 0.0793)	1.492 - 1.501 (0.0587 - 0.0591)
0.03 (0.0012) undersize	Journal O.D.	59.962 - 59.978 (2.3607 - 2.3613)	59.962 - 59.978 (2.3607 - 2.3613)	51.954 - 51.970 (2.0454 - 2.0461)
0.03 (0.0012) undersize	Bearing size (Thickness at center)	2.017 - 2.020 (0.0794 - 0.0795)	2.019 - 2.022 (0.0795 - 0.0796)	1.510 - 1.513 (0.0594 - 0.0596)
0.05 (0.0020) undersize	Journal O.D.	59.942 - 59.958 (2.3599 - 2.3605)	59.942 - 59.958 (2.3599 - 2.3605)	51.934 - 51.950 (2.0446 - 2.0453)
0.05 (0.0020) undersize	Bearing size (Thickness at center)	2.027 - 2.030 (0.0798 - 0.0799)	2.029 - 2.032 (0.0799 - 0.0800)	1.520 - 1.523 (0.0598 - 0.0600)
0.25 (0.0098) undersize	Journal O.D.	59.742 - 59.758 (2.3520 - 2.3527)	59.742 - 59.758 (2.3520 - 2.3527)	51.734 - 51.750 (2.0368 - 2.0374)
0.25 (0.0098) undersize	Bearing size (Thickness at center)	2.127 - 2.130 (0.0837 - 0.0839)	2.129 - 2.132 (0.0838 - 0.0839)	1.620 - 1.623 (0.0638 - 0.0639)
O.D.... Outer Diameter

Measure the thrust clearance of crankshaft at center bearing. If the clearance exceeds the limit, replace bearing.
Crankshaft thrust clearance:

Standard

0.030 - 0.115 mm (0.0012 - 0.0045 in)

Limit

0.25 mm (0.0098 in)

Fig 3: Measuring Crankshaft Thrust Clearance
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 by means of plastigauge. If the measurement is not within the specification, replace defective bearing with an undersize one, and replace or recondition crankshaft as necessary.
Crankshaft oil clearance (#1 - #5):

Standard

0.010 - 0.030 mm (0.0004 - 0.0012 in)

Limit

0.040 mm (0.0016 in)