Measure the clearances in the main bearings:
- install the main bearing caps without liners in accordance with the markings, lubricate the threads and tighten the mounting bolts to a torque of 80 Nm.
- in accordance with Fig. 34, measure the diameter of the hole in directions A, B and C of each main bearing and record it. If the diameter or ovality of the hole increases within 0.02 mm, the defect can be eliminated by lapping on a marking plate using sandpaper.
- unscrew the covers, install the thoroughly cleaned liners and tighten the bolts again.
- measure the diameters of the holes and write them down.
- subtract the diameter of the corresponding crankshaft journal from the bearing bore diameter. The clearance for main bearings should be within 0.035...0.075 mm, for connecting rod bearings 0.015...0.05 mm. The maximum clearance value is 0.08 mm.
- if necessary, the gap can be provided by installing other liners.
[Text republished from the website mercedesman.ru]