How To Select A Main Bearing
WARNING: This page is about a different variant/trim than selected.
When New Cylinder Block and Crankshaft are Used:
- "Main Bearing Selection Table" rows correspond to bearing housing grade on rear left side of cylinder block.
- If there is a corrected stamp mark on the cylinder block, use it as a correct reference.
- Apply pin diameter grade (B) stamped on crankshaft front side to column in "Main Bearing Selection Table".
- A: Journal diameter grade
- Find value at crossing of row and column in "Main Bearing Selection Table".CAUTION:
- There are two main bearing selection tables. One is for odd-numbered journals (1, 3, and 5) and the other is for even-numbered journals (2 and 4). Make certain to use the appropriate table. This is due to differences in the specified clearances.
- Apply the symbol obtained to "Main Bearing Grade Table" to select.NOTE:
- Service parts are available as a set of both upper and lower.
When Cylinder Block and Crankshaft are Reused:
- Measure inner diameter of cylinder block main bearing housing and outer diameter of crankshaft journal.
- Apply measurement in above step 1 to the "Main Bearing Selection Table".
- Follow steps 3 and 4 in "When New Cylinder Block and Crankshaft are Used".
Main Bearing Selection Table (No. 1, 3, and No. 5 journals)
Main Bearing Selection Table (No. 2, and 4 journals)
MAIN BEARING GRADE TABLE (ALL JOURNALS)
| Unit: mm (in) | ||||
|---|---|---|---|---|
| Grade number | Thickness | Identification color (UPR/LWR) | Remarks | |
| 0 | 1.973 - 1.976 (0.0777 - 0.0778) | Black | Grade and color are the same for upper and lower bearings. | |
| 1 | 1.976 - 1.979 (0.0778 - 0.0779) | Brown | ||
| 2 | 1.979 - 1.982 (0.0779- 0.0780) | Green | ||
| 3 | 1.982 - 1.985 (0.0780 - 0.0781) | Yellow | ||
| 4 | 1.985 - 1.988 (0.0781 - 0.0783) | Blue | ||
| 5 | 1.988 - 1.991 (0.0783 - 0.0784) | Pink | ||
| 6 | 1.991 - 1.994 (0.0784 - 0.0785) | Purple | ||
| 01 | UPR | 1.973 - 1.976 (0.0777 - 0.0778) | Black/Brown | Grade and color are different for upper and lower bearings. |
| LWR | 1.976 - 1.979 (0.0778 - 0.0779) | |||
| 12 | UPR | 1.976 - 1.979 (0.0778 - 0.0779) | Brown/Green | |
| LWR | 1.979 - 1.982 (0.0779 - 0.0780) | |||
| 23 | UPR | 1.979 - 1.982 (0.0779 - 0.0780) | Green/Yellow | |
| LWR | 1.982 - 1.985 (0.0780 - 0.0781) | |||
| 34 | UPR | 1.982 - 1.985 (0.0780 - 0.0781) | Yellow/Blue | |
| LWR | 1.985 - 1.988 (0.0781 - 0.0783) | |||
| 45 | UPR | 1.985 - 1.988 (0.0781 - 0.0783) | Blue/Pink | |
| LWR | 1.988 - 1.991 (0.0783 - 0.0784) | |||
| 56 | UPR | 1.988 - 1.991 (0.0783 - 0.0784) | Pink/Purple | |
| LWR | 1.991 - 1.994 (0.0784 - 0.0785) | |||
| 67 | UPR | 1.991 - 1.994 (0.0784 - 0.0785) | Purple/White | |
| LWR | 1.994 - 1.997 (0.0785 - 0.0786) | |||
Use Undersize Bearing Usage Guide
- Use undersize (U.S.) bearing when oil clearance with standard size main bearing is not within specification.
- When using undersize (U.S.) bearing, measure the bearing inner diameter with the bearing installed and grind journal until oil clearance falls within specification.
BEARING UNDERSIZE TABLE
| Unit: mm (in) | |
|---|---|
| Size U.S. | Thickness |
| 0.25 (0.0098) | 2.106 - 2.114 (0.0829 - 0.0832) |
CAUTION:
Do not damage fillet R when grinding crankshaft journal in order to use an undersize bearing (all journals).