Inspection
- Inspect each bearing of upper and lower crankcases for any damage.
Selection
- Place the plastigauge axially along the crankshaft journal, avoiding the oil hole, as shown.
- 09900-22301: Plastigauge
Caution: Never rotate the crankshaft when a piece of plastigauge is installed.
- Tighten the crankcases bolts to the specified torque, in two stages. (3-82)
- Remove the lower crankcase and measure the width of the compressed plastigauge using the envelope scale. This measurement should be taken at the widest part of the compressed plastigauge.
Crankshaft journal oil clearance:
- Standard: 0.016 - 0.034 mm (0.0006 - 0.0013 in)
- Service Limit: 0.080 mm (0.0031 in)
- If the oil clearance exceeds the service limit, select the specified bearings from the bearing selection table.
- Check the corresponding crankcase journal I.D. code number А, "A", "B" or "C" which is stamped on the rear of upper crankcase.
- Check the corresponding crankshaft journal O.D. code number B, "A", "B" or "C" which is stamped on the crankshaft.
Bearing selection table
Crankshaft journal O.D. В | ||||
Code | A | B | C | |
Crankcase I.D. А | A | Green | Black | Brown |
B | Black | Brown | Yellow | |
C | Brown | Yellow | Blue |
Crankcase I.D. specification
Code | I.D. specification |
A | 59.000 - 59.006 mm (2.3228 - 2.3231 in) |
B | 59.006 - 59.012 mm (2.3231 - 2.3233 in) |
C | 59.012 - 59.018 mm (2.3233 - 2.3235 in) |
Crankshaft journal O.D. specification
Code | O.D. specification |
A | 54.994 - 55.000 mm (2.1651 - 2.1654 in) |
B | 54.988 - 54.994 mm (2.1649 - 2.1651 in) |
C | 54.982 - 54.988 mm (2.1646 - 2.1649 in) |
- 09900-20203: Micrometer (50 - 75 mm)
Bearing thickness specification
Color (Part No.) | Thickness |
Green (12229-48G00-0A0) | 1.989 - 1.992 mm (0.0783 - 0.0784 in) |
Black (12229-48G00-0B0) | 1.992 - 1.995 mm (0.0784 - 0.0785 in) |
Brown (12229-48G00-0C0) | 1.995 - 1.998 mm (0.0785 - 0.0787 in) |
Yellow (12229-48G00-0D0) | 1.998 - 2.001 mm (0.0787 - 0.0788 in) |
Blue (12229-48G00-0E0) | 2.001 - 2.004 mm (0.0788 - 0.0789 in) |
Note: Upper and lower crankshaft journal bearings are the same.
Installation
- When fitting the crankshaft journal bearings to the upper and lower crankcases, be sure to fix the stopper part А first and press the other end.
Caution:
- Do not touch the bearing surfaces with your hands.
- Grasp by the edge of the bearing shell.
Crankshaft thrust bearing
- With the crankshaft and thrust bearing 1 inserted in the upper crankcase, measure the thrust clearance by using the thickness gauge.
Thrust clearance:
- Standard: 0.100 - 0.200 mm (0.0039 - 0.0078 in)
- 09900-20803: Thickness gauge
- If the thrust clearance exceeds the standard range, adjust the thrust clearance by the following procedures.
Crankshaft thrust bearing
Crankshaft thrust clearance adjustment
- Remove the thrust bearing and measure its thickness with a micrometer.
- If the thickness of the thrust bearing is below standard, replace it with a new one and once again perform the thrust clearance measurement listed above, checking to make sure it is within standard.
- Select a thrust bearing from the selection table. (3-77)
Thrust bearing thickness:
- Standard: 2.250 - 2.550 mm (0.0886 - 0.1004 in)
- 09900-20205: Micrometer (0 - 25 mm)
Thrust bearing selection table
Clearance before inserting left-side thrust bearing | Color (Part No.) | Thrust bearing thickness | Thrust clearance |
2.400 - 2.450 mm (0.0944 - 0.0965 in) | Red (12228-48G00-0A0) | 2.250 - 2.300 mm (0.0886 - 0.0906 in) | 0.100 - 0.200 mm (0.0039 - 0.0079 in) |
2.450 - 2.500 mm (0.0965 - 0.0984 in) | Black (12228-48G00-0B0) | 2.300 - 2.350 mm (0.0906 - 0.0925 in) | 0.100 - 0.200 mm (0.0039 - 0.0079 in) |
2.500 - 2.550 mm (0.0984 - 0.1004 in) | Blue (12228-48G00-0C0) | 2.350 - 2.400 mm (0.0925 - 0.0945 in) | 0.100 - 0.200 mm (0.0039 - 0.0079 in) |
2.550 - 2.600 mm (0.1004 - 0.1024 in) | Green (12228-48G00-0D0) | 2.400 - 2.450 mm (0.0945 - 0.0965 in) | 0.100 - 0.200 mm (0.0039 - 0.0079 in) |
2.600 - 2.650 mm (0.1024 - 0.1043 in) | Yellow (12228-48G00-0E0) | 2.450 - 2.500 mm (0.0965 - 0.0984 in) | 0.100 - 0.200 mm (0.0039 - 0.0079 in) |
2.650 - 2.700 mm (0.1043 - 0.1063 in) | White (12228-48G00-0F0) | 2.500 - 2.550 mm (0.0984 - 0.1004 in) | 0.100 - 0.200 mm (0.0039 - 0.0079 in) |
А. Color code