Contents: Gasoline engine ↡ Diesel engine ↡
Gasoline engine
6-cylinder petrol engine
1. Oil pump. Suctions engine oil through the suction filter and suction pipe from the oil pan; 2. Longitudinal oil channel to the oil filter; 5. Main oil channel. To the bearing areas; 6. Oil jets. Engine oil is injected from below for cooling towards the piston bases; 7. Pressure pipe to the chain tensioner; 8. Check valve; 9. Chain tensioner; 10. Gas outlet hole in the cylinder head gasket; 14. Oil jet for control chain 15. Pressure pipe to cylinder head; 17. Oil throttle. Inner diameter 4 mm; 22. Oil channel. For lubrication of 12 plate tappets on the exhaust side; 23. Oil channel. For lubrication of 12 plate tappets on the intake side; 27. Camshaft adjuster; 30. Hydraulic disc pusher; a. Oil channel from the oil pump to the oil radiator; b. Oil channel from the oil filter to the bearing surfaces; c. Drain hole in the oil pan
The oil pressure relief valve is located in the channel between the suction chamber and the compression chamber of the oil pump. If the oil pressure is above 5 bar, the valve opens and some of the oil can flow back into the suction chamber of the pump.
If the oil pressure is too low when the oil level is normal, check the valve.
Removal
1. Vinite plug, SW22; 2. Compression spring; 3. Guide pin; 4. Piston
1. Disassemble the oil pan.
2. Unscrew the screw plug with a SW22 wrench.
Caution! The screw plug is under pressure from the compression spring and can easily jump out.
3. Remove the compression spring, guide pin and piston.
Caution: A stiff or jammed piston can be removed using ring pliers.
4. Clean the hole in the oil pump and blow it out with compressed air.
5. Move the oil pump hole piston back and forth several times. If the piston moves with difficulty, smooth it slightly with a polishing cloth.
Installation
1. If you are replacing the piston, check that it moves easily in the bore. If necessary, remove burrs from the piston with an emery cloth.
2. Install the piston with the guide pin and new compression spring.
Original can be found on the website (MercedesMan.ru)
3. Screw in the screw plug without the sealing ring and tighten to a torque of 50 Nm.
Diesel engine
The oil pressure relief valve is located in the connecting channel between the compression and suction chambers of the oil pump. If the pressure exceeds 5 bar, the valve opens and part of the oil flows into the suction chamber. The valve should be checked if its pressure is too low with a normal oil level.
Removal
249. Vinite plug, 50 Nm.; 250. Guide pin; 251. Compression spring; 252. Piston
1. Remove the oil pan.
2. Unscrew the screw plug.
Caution! The screw plug is under pressure from the compression spring and can easily jump out.
3. Remove the compression spring, guide pin and piston.
Caution! If the piston is stiff or jammed, remove it using the outer ring collet.
4. Clean the oil pump cylinder and blow it out with compressed air.
5. Move the piston back and forth in the oil pump cylinder several times. If the piston moves with difficulty in the cylinder, lightly polish the piston on a cloth lap.
Installation
1. If the piston is being replaced with a new one, check the new piston for ease of movement in the cylinder. If necessary, remove burrs on the piston with an emery cloth.
2. Install the piston with the guide pin and new compression spring.
3. Screw in the plug without the sealing ring and tighten to a torque of 50 Nm. The screw plug is sealed with a conical fit.