Table of contents: When using new connecting rod and…↓ When using used connecting rods and…↓ Connecting rod bearing selection…↓ Use of connecting rod bearing size…↓
When using new connecting rod and crankshaft
1. Determine the size group of the diameter of the opening of the lower head of the connecting rod according to the mark stamped on the side surface to select the line of the "Connecting rod bearing selection table".
A. Oil hole.
B. Factory code.
C. Cylinder number.
D. Dimension group of the connecting rod lower head bore.
E. Dimensional group of the upper connecting rod head bore.
F. Front mark.
2. Determine the size group of the crankshaft connecting rod journal using the stamp on the front side of the crankshaft to select the "Connecting rod bearing selection table" column.
A. Crankpin size group No.1.
B. Size group of connecting rod journal No.2.
C. Size group of connecting rod journal No.3.
D. Connecting rod journal size group No.4.
E. Size group of the root neck No.1.
F. Size group of the root neck No.2.
G. Size group of the root neck No.3.
H. Size group of the root neck No.4.
I. Size group of the root neck No.5.
3. Determine the symbol at the intersection of the selected row and column in the "Connecting Rod Bearing Selection Table".
4. Using the received symbol, select connecting rod bearings of the required thickness.
When using used connecting rods and crankshaft
1. Measure the diameters of the crankshaft journal and the connecting rod lower head bore separately.
2. Use the obtained results for the "Connecting Rod Bearing Selection Table".
3. Determine the symbol at the intersection of the selected row and column in the "Connecting Rod Bearing Selection Table".
4. Using the received symbol, select connecting rod bearings of the required thickness.
Connecting rod bearing selection table
Note: See the Service Data and Specification section at the end of the chapter.
Use of connecting rod bearing size groups
In cases where the specified oil clearance value is not ensured when using standard size group liners, repair size group liners should be used.
Measure the diameter of the bore of the lower connecting rod head with the bearing shells installed and regrind the connecting rod journal of the crankshaft to ensure the required clearance.
Attention. When grinding the neck for repair liners, it is necessary to ensure the radius of the fillets (A) equal to 1.5-1.7 mm.
