Contents: Features of the device ↳ Flywheel ↳ Replacing the front crankshaft oil… ↳ Replacing the front crankshaft oil… ↳
Features of the device
The crankshaft is cast from spheroidal graphite iron, dynamically balanced. It is mounted on five supports (on three for the GLA engine). The axial movement of the crankshaft is limited by thrust half rings with a thickness of 2.301-2.351 mm of the nominal size, 2.491-2.541 mm of the repair size (for the GLA engine - 2.80-2.85 mm and 2.99-3.04 mm, respectively). The value of the axial clearance of the crankshaft is 0.079-0.279 mm for the GLA engine. 0.09-0.30 mm for engines of other models. The width of the main bearing shells of the GLA engine is 22.04-22.10 mm.
Flywheel
The flywheel is attached to the crankshaft flange with six bolts (five for the GLA engine). The flywheel with the crankshaft and clutch assembly is balanced statically and dynamically. The toothed rim is installed on the flywheel with tension. To do this, it is heated to a temperature of 260-280°C before installation.
Replacing the front crankshaft oil seal (all engine models except GLA)
Disconnect the wire from the negative terminal of the storage battery and loosen the crankshaft toothed pulley mounting bolt. Loosen the generator mount and remove the accessory drive belt. Remove the pulley from the crankshaft. Remove the front toothed belt protective cover and, turning the crankshaft, align the toothed pulley marks as indicated in the "Camshaft" section. Loosen the two toothed belt tensioner mounting bolts, press the tensioner to the left and tighten its mounting bolts again. Remove the toothed belt.
Using tool 21.098 (Fig. 2.36), remove the toothed pulley and thrust washer. Remove the front crankshaft oil seal from the oil pump housing (Fig. 2.37).
Lightly lubricate the working edges of the new oil seal with engine oil and install using tool 21.093. Install the thrust washer with the convex side facing outward. Install the toothed pulley using the accessory drive belt pulley, tightening its mounting bolt to a torque of 10.0-11.5 kgf·m. Check the correct installation of the toothed pulleys, install the toothed belt, protective cover and tighten its mounting bolts to a torque of 0.7-0.9 kgf·m. Put on and tension the accessory drive belt; connect the battery.
Replacing the front crankshaft oil seal of the GLA engine
To perform this operation, the engine can remain on the vehicle, however, due to the difficult access to the seal, special tools are required.
Disconnect the wire from the negative terminal of the storage battery. Remove the generator mounting bracket and the adjusting bar. Remove the accessory drive belt. Raise the vehicle and, working from below, unscrew the accessory drive pulley mounting bolt and remove the pulley. Using tool 21.096 (Fig. 2.38), remove the crankshaft oil seal.
Lightly lubricate the working edges of the new oil seal and the nose of the crankshaft with engine oil. Install the oil seal and press it into the socket by hand. Install the 21.046 mandrel (Fig. 2.39) on the oil seal, then install the pulley and gradually tighten its mounting bolt until the oil seal is seated.
Remove the pulley and mandrel, then install the pulley and tighten its mounting bolt to a torque of 5.4-5.9 kgf·m. Lower the vehicle. Put on and tighten the accessory drive belt. The total belt deflection in both directions should be 13 mm (see the Cooling System section). Check the oil level in the engine crankcase and connect the battery.
