Crankshaft And Crankshaft Bearing

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

   Crankshaft bend limit: 

   0.035 mm (0.0014 in) 

   Fig 1: Measuring Bend Of Crankshaft

   Courtesy of SUBARU OF AMERICA, INC.
3. Inspect the crank journal and crank pin for wear. If they are not within the specifications, replace the bearing with a suitable (undersize) one, and replace or recondition 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 

   0.003 mm (0.0001 in) 

   Cylindricality 

   0.004 mm (0.0002 in) 

   Grinding limit 

   To 51.750 mm (2.0374 in) dia. 

   Crank journal: 

   Out-of-roundness 

   0.005 mm (0.0002 in) 

   Cylindricality 

   0.006 mm (0.0002 in) 

   Grinding limit 

   To 59.750 mm (2.3524 in) dia. 

   Fig 2: Inspecting Crank Journal And Crank Pin For Wear

   Courtesy of SUBARU OF AMERICA, INC.
   CRANK JOURNAL OUTER DIAMETER
   
   

   Unit: mm (in)
   		Crank journal outer diameter		Crank pin outer diameter
   		#1,#3	#2, #4, #5
   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)
   	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)
   	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)
   	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)
   	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)

4. Measure the side clearance of crankshaft at center bearing. If clearance exceeds the limit, replace the bearing.

   Crankshaft side clearance: 

   Standard 

   0.030 - 0.115 mm (0.0012 - 0.0045 in) 

   Fig 3: Measuring Side Clearance Of Crankshaft Center Bearing

   Courtesy of SUBARU OF AMERICA, INC.
5. Inspect individual crankshaft bearings for signs of flaking, seizure, melting and wear.
6. Measure the oil clearance on each crankshaft bearing by means of plastigauge. If the measurement is not within the specification, replace the defective bearing with an undersize one, and replace or recondition the crankshaft as necessary.

Crankshaft oil clearance: 

Standard 

0.010 - 0.030 mm (0.0004 - 0.0012 in)