Removal
1. Remove the pistons.
Examination
2. Check the connecting rods for discoloration, scuffs and scratches.
3. Unscrew the mounting bolts and remove the connecting rod caps.
4. Measure the diameters of the lower and upper heads of the connecting rod (figure 2.45). If the measured value is greater than the permissible value, grind the contact surface of the connecting rod cap by 0.2 mm.
Figure 2.45. Checking the diameters of the upper and lower connecting rod heads using an indicator.
5. Check the inner diameter of the connecting rod upper head bushing (figure 2.46). If it is more than the permissible value, replace the bushing. The dimensions of the connecting rods are given in Table 2.7.
Figure 2.46. Main dimensions of the connecting rod: 1 - Connecting rod; 2 - Connecting rod cover; 3 - Connecting rod upper head bushing; 4 - Keyway; 5 - Connecting rod cover fastening bolt; 6 - Balance weights; 7 - Connecting rod identification field; 8 - Grooves for installing liners; 9 - Oil channels. "b" - Width of the upper connecting rod head; "B" - Width of the lower connecting rod head; "d" - Inner diameter of the connecting rod upper head bushing; "d1" - Diameter of the hole for the bushing of the upper head of the connecting rod; "D1" - Diameter; "L" - Distance between the centers of the connecting rod heads.
[Information copied from the website: MercedesMAN.ru]
Installation
6. Installation is carried out in the reverse order of removal.
Table 2.7. Connecting rod dimensions
| Parameters | Engines 602.984/985 | |
| Distance between centers of connecting rod heads L, mm | 144.97-145.03 | |
| Width of the upper b and lower B connecting rod heads, mm | 21.95-22.00 | |
| Diameter D1 of the lower connecting rod head, mm | 51.600-51.614 | |
| Permissible deviation from roundness and taper of the lower head of the connecting rod, mm | 0.02 | |
| Permissible twist of the lower head of the connecting rod relative to the upper head per 100 mm of the length of the connecting rod, mm | 0.1 | |
| Permissible difference in deviation from parallelism between connecting rod heads per 100 mm of connecting rod length, mm | 0.05 | |
| Permissible difference in weight between connecting rods, g | 2 | |
| Inner diameter of the connecting rod upper head bushing d, mm | 28.018-28.024 | |
| Outer diameter of the bushing, mm | 30.575-30.600 | |
| Diameter under the bushing in the upper head of the connecting rod d 1, mm | 30.500-30.525 | |
| Piston pin clearance in connecting rod upper head bushing, mm | 0.007-0.018 | |
| Maximum protrusion (Rz) of connecting rod bushing outward, µm | 5 | |
| Connecting Rod Bolt Diameter | M9x1 | |
| Length of connecting rod bolt, mm | New | 52-0.3 |
| Acceptable | 52.9 | |