How To Select Main Bearing
WARNING: This page is about a different car, the 2013 Nissan Armada. However, it is still accessible from the selected car via links, so may be relevant.
When New Cylinder Block and Crankshaft are Used
- Apply the main bearing housing grade on the bottom face of the cylinder block to the row in "Main Bearings Selection Table".
- Apply the journal diameter grade on the crankshaft front to the column in "Main Bearings Selection Table".
- Read the symbol at the cross point of the selected row and column in the "Main Bearings Selection Table".CAUTION:
- Initial clearance for No. 1, 5 journal and No. 2, 3, 4 journal is different. Use two different selection lists for each part.
- No. 1, 5 journal and No. 2, 3, 4 journal have the same signs but different measures. Do not confuse them.
- Apply the symbol to the "Main Bearings Grade Table" to select.NOTE:
- Grade list applies to all journals.
- Service parts are available as a set of both upper and lower.
When Cylinder Block and Crankshaft are Reused
- Measure the inside diameter of the cylinder block main bearings housing and the outside diameter of the crankshaft journal.
- Apply measurement in above step 1 to "Main Bearings Selection Table".
- The following steps are same as in "When New Cylinder Block and Crankshaft are Used".
Main Bearings Selection Table (No. 1 and No. 5 journal)
Main Bearings Selection Table (No. 2, 3 and 4 journal)
MAIN BEARINGS GRADE TABLE (ALL JOURNALS)
| Unit: mm (in) | ||||
|---|---|---|---|---|
| Grade number | UPR/LWR | Thickness | Identification color | Remarks |
| 0 | - | 2.483 - 2.486 (0.0978 - 0.0979) | Black | Grade is the same for upper and lower bearings. |
| 1 | - | 2.486 - 2.489 (0.0979 - 0.0980) | Brown | |
| 2 | - | 2.489 - 2.492 (0.0980 - 0.0981) | Green | |
| 3 | - | 2.492 - 2.495 (0.0981 - 0.0982) | Yellow | |
| 4 | - | 2.495 - 2.498 (0.0982 - 0.0983) | Blue | |
| 5 | - | 2.498 - 2.501 (0.0983 - 0.0985) | Pink | |
| 6 | - | 2.501 - 2.504 (0.0985 - 0.0986) | Purple | |
| 7 | - | 2.504 - 2.507 (0.0986 - 0.0987) | White | |
| 8 | - | 2.507 - 2.510 (0.0987 - 0.0988) | Red | |
| 01 | UPR | 2.483 - 2.486 (0.0978 - 0.0979) | Black | Grade and color are different for upper and lower bearings. |
| LWR | 2.486 - 2.489 (0.0979 - 0.0980) | Brown | ||
| 12 | UPR | 2.486 - 2.489 (0.0979 - 0.0980) | Brown | |
| LWR | 2.489 - 2.492 (0.0980 - 0.0981) | Green | ||
| 23 | UPR | 2.489 - 2.492 (0.0980 - 0.0981) | Green | |
| LWR | 2.492 - 2.495 (0.0981 - 0.0982) | Yellow | ||
| 34 | UPR | 2.492 - 2.495 (0.0981 - 0.0982) | Yellow | |
| LWR | 2.495 - 2.498 (0.0982 - 0.0983) | Blue | ||
| 45 | UPR | 2.495 - 2.498 (0.0982 - 0.0983) | Blue | |
| LWR | 2.498 - 2.501 (0.0983 - 0.0985) | Pink | ||
| 56 | UPR | 2.498 - 2.501 (0.0983 - 0.0985) | Pink | |
| LWR | 2.501 - 2.504 (0.0985 - 0.0986) | Purple | ||
| 67 | UPR | 2.501 - 2.504 (0.0985 - 0.0986) | Purple | |
| LWR | 2.504 - 2.507 (0.0986 - 0.0987) | White | ||
| 78 | UPR | 2.504 - 2.507 (0.0986 - 0.0987) | White | |
| LWR | 2.507 - 2.510 (0.0987 - 0.0988) | Red | ||
Use Undersize Bearing Usage Guide
- Use undersize (US) bearing when the oil clearance with standard size main bearing is not within specification.
- When using undersize (US) bearing, measure the inside diameter of the bearing installed and grind the journal until the oil clearance falls within specification.
BEARING UNDERSIZE TABLE
| Unit: mm (in) | |
|---|---|
| Undersize | Thickness |
| 0.25 (0.0098) | 2.618 - 2.626 (0.1031 - 0.1034) |
CAUTION:
Do not damage fillet R when grinding crankshaft journal in order to use undersized bearing (All journals).
Fillet R: 1.5 - 1.7 mm (0.059 - 0.067 in)