Main and connecting rod bearings — inspection and selection (Nissan Terrano 1)

1. Main and connecting rod bearings must be replaced during major engine repairs, however previously used bearings should be carefully checked to restore the general condition of the engine at the time of repair.

2. Causes of crankshaft bearing failure include insufficient lubrication due to improper assembly (channel overlap, small gap), contamination and penetration of foreign particles (untimely replacement of oil and filter, damage to seals), frequent engine overloads and corrosion (caused by frequent short trips). Regardless of the reason that caused the destruction of the bearings, it should be eliminated.

3. If the crankshaft is not going to be reground, then it is necessary to select bearings of a standard size group (after regrinding the journals, only repair bearings are installed). After selection, the clearances in the bearings should be checked.

4. On 4-cylinder engines, the number of the main bearing size group is stamped on the surface of the oil pan (photo).

17.4a Locations of main bearing size group numbers on 4-cylinder engines
1. To the front of the engine; 2. Group B; 3. Size group of molar necks

5. On 4-cylinder engines, group B liners are installed on the 2nd and 4th journals (if the crankshaft has not been reground). The group of bearing journals 1,3 and 5 (A or B) is stamped on the pallet (photo).

17.5a Diagram of selection of main bearings on 4-cylinder engines

The text was borrowed from here: NISSANBOOK.ru

17.5b The group B insert has a blue marking
1. Group A; 2. Group B; 3. Marking

17.5b Locations of application of 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	Crankshaft journal size group number
Insert number	0	1	2
0	0	1	2
1	1	2	3
2	2	3	4

3. Place of application of the crankshaft journal size group number (applied in order from the 7th neck to the 5th) 4. Places of application of main bearing numbers

6. On V6 engines, the numbers must additionally determine the size groups of the liners and main bearing, and then by the sum of these numbers (or from the table) determine the insert group (photo).

17.6a Location of application of bearing group numbers of paired journals on V6 engines (in order from right to left), 1st support - in front, 4th - in the back.