2. The reasons for the destruction of the crankshaft bearings are insufficient lubrication due to improper assembly (channel overlap, small gap), pollution and penetration of foreign particles (untimely replacement of oil and filter, violation of seals), frequent engine overloads and corrosion (caused by frequent short trips). Regardless of the cause that caused the destruction of the bearings, it must be eliminated.
3. If the crankshaft will not be reground, then it is necessary to select bearings of a standard size group (after regrinding the necks, only repair bearings are installed). After selection, check the clearances in the bearings.
4. On 4-cylinder engines, the number of the size group of the main bearings is stamped on the plane of the pallet (photo).
17.4a Places for applying the numbers of size groups of main bearings on 4-cylinder engines
1. To the front of the engine; 2. Group B; 3. Size group of main journals
5. On 4-cylinder engines, group B liners are installed on the 2nd and 4th necks (if the crankshaft has not been reground). Neck insert group 1,3 and 5 (A or B) embossed on a pallet (photo).
17.5a Diagram of selection of main bearings on 4-cylinder engines
17.5b Group B insert is marked blue
1. Group A; 2. Group B; 3. Marking
17.5b Places for applying the numbers of size groups I of main bearings on V6 engines
1. Size group of the 1st bearing; 2. To the front of the engine
Table of codes for selection of main bearings on K24 engines
Insert number | Number of the size group of the crankshaft journal | ||
0 | 1 | 2 | |
0 | 0 | 1 | 2 |
1 | 1 | 2 | 3 |
2 | 2 | 3 | 4 |
3. Place of drawing the number of the size group of the crankshaft journal (applied in order from the 7th neck to the 5th) 4. Places of drawing numbers of the main bearing
6. On V6 engines, the numbers must be additionally determined by the size groups of the liners and the main bearing, and then by the sum of these numbers (or from table) define the insert group (photo).
17.6a Place of drawing the numbers of the groups of supports of the twin necks on V6 engines (in order from right to left), 1st support - in front, 4th - behind.
17.6b Table for selection of main bearings on V6 engines