The causes of crankshaft bearing failure are insufficient lubrication due to improper assembly, contamination and penetration of foreign particles, frequent engine overloads, corrosion, etc. Regardless of the cause of bearing failure, it should be eliminated.
Types of wear of main and connecting rod bearings
Selection of main bearings
Diagram for selection of connecting rod bearings on 3F-E engines
| Marking A | 1.484 – 1.488 mm |
| Marking B | 1.488 – 1.492 mm |
| Marking C | 1.492 – 1.496 mm |
The original source is located on the website (www.ToyotaMan.ru)
Diagram for selection of connecting rod bearings of crankshaft on 3F-E engines
1. Crankshaft; 2. Central counterweight; 3. Bearing N3; 4. Bearing size group
Marking on the bearing | |||||||||
| Number on the crankshaft | 3 | 4 | 5 | ||||||
| Number on the cylinder block | 6 | 7 | 8 | 6 | 7 | 8 | 6 | 7 | 8 |
| Bearing size group* | T3 | T4 | T5 | T2 | T3 | T4 | T1 | T2 | T3 |
* Example: Crankshaft number 5, cylinder block number 7 = size group T2.
Main bearing diameter and main bearing bore ID on 3F-E engines
| Crankshaft journal diameter | № | mm |
| Marking-3 | N1 | 66.972 – 66.980 |
| N₂ | 68.472 – 68.480 | |
| N3 | 69.972 – 69.980 | |
| N4 | 71.472 – 71.480 | |
Marking-4 | N1 | 66.980 – 66.988 |
| N₂ | 68.480 – 68.488 | |
| N3 | 69.980 – 69.988 | |
| N4 | 71.480 – 71.488 | |
Marking-5 | N1 | 66.988 – 66.996 |
| N₂ | 68.488 – 68.496 | |
| N3 | 69.988 – 69.996 | |
| N4 | 71.488 – 71.496 | |
| Main bearing bore diameter | N | mm |
Marking-6 | N1 | 72.010 – 72.018 |
| N₂ | 73.510 – 73.518 | |
| N3 | 75.010 – 72.018 | |
| N4 | 76.510 – 76.518 | |
Marking-7 | N1 | 72.018 – 72.026 |
| N₂ | 73.518 – 73.546 | |
| N3 | 75.018 – 75.026 | |
| N4 | 76.518 – 76.526 | |
Marking-8 | N1 | 72.026 – 72.034 |
| N₂ | 73.526 – 73.534 | |
| N3 | 75.026 – 75.034 | |
| N4 | 76.526 – 76.524 |
Diagram for selecting standard connecting rod bearings on 1FZ-FE engines
The number applied | |||||||||
| Markings on the connecting rod | 1 | 2 | 3 | ||||||
| Number on the crankshaft | 1 | 2 | 3 | 1 | 2 | 3 | 1 | 2 | 3 |
| Bearing size group marking* | 2 | 3 | 4 | 3 | 4 | 5 | 4 | 5 | 6 |
* Example: Connecting rod number 3 + crankshaft number 1 = Bearing size group 4.
Diagram for selection of standard crankshaft main bearings on 1FZ-FE engines
| The number applied | |||||||||
| Marking on the cylinder block | 1 | 2 | 3 | ||||||
| Number on the crankshaft | 1 | 2 | 3 | 1 | 2 | 3 | 1 | 2 | 3 |
| Bearing size group marking* | 2 | 3 | 4 | 3 | 4 | 5 | 4 | 5 | 6 |
* Example: Cylinder block number 2 + crankshaft number 1 = Bearing size group 3.
Main bearing diameter and main bearing bore inner diameter on 1FZ-FE engines
| Main bearing bore diameter: | |
- marking 1 | 74.026 – 74.032 mm |
| - marking 2 | 74.032 – 74.038 mm |
| - marking 3 | 74.03 – 74.044 mm |
| Crankshaft journal diameter: | |
- marking 1 | 68.994 – 69.000 mm |
| - marking 2 | 68.988 – 68.994 mm |
| - marking 3 | 68.982 – 68.988 mm |
| Standard bearing thickness: | |
- marking 2 | 2.489 – 2.492 mm |
| - marking 3 | 2.49 – 2.495 mm |
| - marking 4 | 2.495 – 2.498 mm |
| - marking 5 | 2.498 – 2.501 mm |
| – marking 6 | 2.501 – 2.504 mm |
1. If bearings of standard size groups are installed, then the new bearing is selected according to the numbers applied to the one being replaced, as well as according to the numbers on the cylinder block and crankshaft using tables.
2. If the crankshaft was ground, then the bearings should be selected at the auto service center where the grinding was performed.
3. After selecting the bearings, measure the clearance in the journals (see subsection 3.3.8.2).
4. In factory conditions, when assembling the engine, bearings with different color markings are installed, which are applied to the edge of the bearing shell.
5. Bearing size group markings are usually applied on the side of the bearing facing the rear of the crankshaft, with the exception of the rear main bearing, which is marked on the side facing the front of the crankshaft.
6. It is allowed to install upper and lower liners from different size groups. For example, to adjust the gap by 0.0125 mm, the standard liner is sometimes used with an liner from a group with a reduced diameter by 0.025 mm.
Attention! It is prohibited to install a pair of liners if the difference in their diameters exceeds 0.025 mm. Liners of different sizes should be installed either all on top or all on the bottom.