Balancer Shaft Inspection

Seat the balancer shaft by pushing it away from the oil pump sprocket end of the oil pump.
Zero the dial indicator against the end of the balancer shaft, then push the balancer shaft back and forth and read the end play.
Balancer Shaft End Play

Front Balancer Shaft:
- Standard (New): 0.063-0.108 mm (0.0025-0.0043 in.)
Service Limit: 0.14 mm (0.0055 in.)

Rear Balancer Shaft:
- Standard (New): 0.063-0.108 mm (0.0025-0.0043 in.)
Service Limit: 0.14 mm (0.0055 in.)

Fig 1: Checking Balancer Shaft End Play With Dial Indicator
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Remove the pump housing.

Fig 2: Identifying Pump Housing
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Remove the baffle plate (A) and upper balancer shaft holder (with bearings) (B), then remove the front balancer shaft (C) and rear balancer shaft (D).

Fig 3: Identifying Baffle Plate, Upper Balancer Shaft Holder, Front Balancer Shaft & Rear Balancer Shaft
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Measure the inner diameter of the No. 1 bearing for the front balancer shaft hole and the rear balancer shaft hole.
Bearing Inner Diameter

Front:
- Standard (New): 20.000-20.020 mm (0.7874-0.7882 in.)
Service Limit: 20.03 mm (0.789 in.)

Rear:
- Standard (New): 24.000-24.020 mm (0.9449-0.9457 in.)
Service Limit: 24.03 mm (0.946 in.)

Fig 4: Measuring Inner Diameter Of No. 1 Bearing
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Measure the diameters of the No. 1 journals on the front balancer shaft and rear balancer shaft.
Journal Diameter

Front:
- Standard (New): 19.938-19.950 mm (0.7850-0.7854 in.)
Service Limit: 19.92 mm (0.784 in.)

Rear:
- Standard (New): 23.938-23.950 mm (0.9424-0.9429 in.)
Service Limit: 23.92 mm (0.942 in.)

Fig 5: Measuring Diameters Of No. 1 Journals
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Clean both balancer shaft No. 2 journals and bearing halves with a clean shop towel.
Place one strip of plastigage across each No. 2 journal.
Reinstall the bearings and upper balancer shaft holder, then torque the bolts.
NOTE: Do not rotate the balancer shafts during inspection.

Fig 6: Bearings & Upper Balancer Shaft Holder With Torque Specifications
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Remove the upper balancer shaft holder and bearings again, and measure the widest part of the plastigage. If the balancer shaft No. 2 journal oil clearance is out-of-tolerance, install new bearings, and recheck. If it is still out-of-tolerance, replace the balancer shafts.
No. 2 Journal Oil Clearance

Standard (New): 0.060-0.120 mm (0.0024-0.0047 in.)

Service Limit: 0.15 mm (0.006 in.)

Fig 7: Measuring Widest Part Of Plastigage
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Align the punch mark on the rear balancer shaft in the center of the two punch marks on the front balancer shaft, then install the balancer shafts on the lower balancer shaft holder.

Fig 8: Aligning Punch Mark On Rear Balancer Shaft
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Apply new engine oil to the threads of the 8 mm bolts (A).

Fig 9: Applying Engine Oil To Threads Of Bolts With Torque Specifications
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Install the upper balancer shaft holder (B) and baffle plate (C).
Install the pump housing.

Fig 10: Pump Housing With Torque Specifications
Courtesy of AMERICAN HONDA MOTOR CO., INC.