Attention: The presence of metal chips or a large number of small metal particles found during engine repairs may indicate damage to the crankshaft bearings and connecting rods. To prevent further damage from developing, thoroughly clean the oil passages and replace the oil nozzles, oil cooler and oil filter.
Note: If the parts to be removed are to be reused, position them so that they are in the same location and orientation during installation.
1. Details of the installation and assembly of the crankshaft and the connecting rod and piston group are indicated on the resist. illustrations.
33.1a Installation details of the crankshaft
1 cylinder block
2 Main bearings on the side of the cylinder block, with oil grooves
3 crankshaft
4 Main bearings on cap side, no oil grooves
5 Bolt, to be replaced
6 Main bearing caps
7 Bolt, to be replaced, 10 Nm, then retighten 90°, after loosening replace the rotor 8
8 SKR sensor rotor, to be replaced
9 No. 3 main bearing thrust washers
10 Bolt, to be replaced
33.1b Installation details of the connecting rod and piston group
1 Cover bolts 2, to be replaced, tighten with lubricated threads and mating surface, 30 Nm, then tighten 90°
2 Connecting rod bearing cap, fits in one position only and only on the paired connecting rod (see point 11)
3 Connecting rod bearing shells
4 Pressure relief valve, 1.6+1.9 bar, 27 Nm
5 Oil nozzle for piston cooling
6 Retaining ring
7 Piston pin, for easier removal, heat the piston to 60°C
8 Piston with combustion chamber, the arrow on the bottom must point towards the timing drive
9 Compression rings, installed at intervals of 120°between locks, mark "TOR" must face the piston crown
10 Oil scraper ring, 2-piece, top lock set at 120°intervals from close compression ring lock
11 Connecting rod, replace only complete with cap 2, marked "A" accessories for cylinder and label "IN " timing side
2. The numbering of the crankshaft main bearing caps starts from the timing side. The projections for holding the main bearing shells in the cylinder block and in the covers must match.
3. Main bearing shells with oil grooves are installed in the cylinder block, and without oil grooves - in the main bearing caps.
4. After removing the crankshaft, lay it so that it does not rest on the rotor of the CKP sensor.
5. The sequence of tightening the bolts of the main bearing caps is indicated on the resist. illustrations. Tighten the bolts first (1-10) And (arrows A) by hand, then tighten the bolts (1-10) with a force of 65 Nm, and then tighten them at an angle of 90°. Then tighten the bolts (arrows A) with a force of 20 Nm, and then tighten them at an angle of 90°.
33.5 Tightening sequence of the main bearing cap bolts
6. Install the main bearing shells with the correct color marking, determined by the letter in the corresponding position of the code. The letter code for determining the color marking of the liners used on the side of the cylinder block can be indicated either on the surface of the cylinder block mating with the oil pan (see illustration 33.6a), or at the end of the cylinder block (see illustration 33.6b). The letter code for determining the color marking of the liners installed in the main bearing caps is indicated on the crankshaft (see illustration 33.6c). The letters in the code indicate the following color marks on the earbuds: S - black, R - red, B - blue, G - yellow, W - white.
33.6a Code for determining the markings of the upper liners (indicated on the bottom surface of the cylinder block)
33.6b Code for defining markings for upper bushings (indicated on the end surface of the cylinder block)
33.6c Code for determining the markings of the lower liners
7. Connecting rods and connecting rod bearing caps are chipped, so they should only be replaced together. The marks on the connecting rods and connecting rod bearing caps must be on the same side. Install connecting rod bearing shells in the center (both in the connecting rod and in its cap), to distance (and on the opposite illustrations) both sides were the same. Inserts with a hole are installed in the connecting rods (1), and liners without a hole - in the connecting rod bearing caps (2).
33.7 Installation position of the connecting rod bearing shells
8. On new connecting rods, the connecting rod bearing cap may not be completely broken off from the connecting rod. If it is not possible to break it off by hand, lightly secure the connecting rod in a vice with soft jaws below the fault line (below the center of the hole), unscrew the cover bolts 5 turns and hit the cover with a plastic-faced hammer (see illustration 14.4).