Figure 65. Parts installed on the cylinder block: 1 — connecting nipple; 2 - threaded nozzle; 3 - connecting nipple for draining coolant, on the right side; 4, 5 - sealing rings; 6 — cylinder block plug; 7 — cylinder block; 8 - ball blocking the oil line at the rear; 9 — flange of the rear crankshaft seal; 10 — rear crankshaft oil seal; 11 — bolt for fastening the flange of the rear crankshaft seal to the cylinder block; 12 - elastic washer; 13 - Oil spray nozzle for piston cooling system, new design; 14 - Hexagon head bolt; 15 — oil spray nozzle of the piston cooling system, obsolete design; 16 — main bearing cap mounting bolt; 17 — main bearing cap; 18 — seat bushing of the camshaft drive mechanism cover; 19 - plug for closing the oil channel in front; 20 - ball that locks the oil line in front; 21 — nipple for connecting the chain lubrication supply tube; 22 — chain lubrication supply tube; 23 — sealing ring of the oil spray nozzle on the block; 24 - screw plug on the left side; 25 - sealing ring
The rear crankshaft seal is assembled in a holder, which is bolted to the rear end wall of the cylinder block, and represents its cover. Figure 65 shows the crankshaft oil seal holder on the right side. The correct position of the holder relative to the crankshaft axis is determined by two mounting pins located on each side. The seal of the holder on the cylinder block is provided by the sealant Loctite. When replacing the holder or the cuff, it is necessary to perform the following operations:
- remove gearbox;
- remove the flywheel or the drive disk of the torque converter (subsection 2.8.4);
Figure 92. Removing the rear crankshaft oil seal
- if it is necessary to replace only the cuff, it is removed using a screwdriver, as shown in the figure 92. A piece of thick cloth should be placed under the screwdriver's support point to avoid damaging other parts;
- unscrew the mounting bolts along the outer perimeter of the holder and two bolts from the bottom;
Figure 93. Removing the crankshaft oil seal holder
- insert two screwdrivers under the flange of the holder in the places indicated by the arrows in the figure 93, and carefully press it away from the cylinder block;
- if necessary, the cuff can be removed with a screwdriver without causing damage to the holder;
- thoroughly clean the mating surfaces on the cover and cylinder block;
- insert a new cuff into the holder if it was removed from it. The sealing lip of the new ring is offset by 3mm, so it will not sit on the crankshaft flange at the same point as the old ring. The space between the sealing and dust-catching edges should be filled with approximately 1 g of plastic grease;
- apply sealant to the sealing surface of the cover and attach it to the cylinder block so that the mounting pins fit into the holes provided for them. Tap the lid gently from above to make it fit more tightly. At the Mercedes-Benz service station, a special clamping tool is used for these purposes;
- tighten the two lower bolts, and then all the others to a torque of 10 Nm;
- then carry out the work in the reverse order of removal.