Cylinder block of 4-cylinder petrol engine
1 – block of cylinders; 2 – a back cover of a cranked shaft; 3 – a forward cover of a cranked shaft; 4 – an arm of a support of the engine; 5 – a forward sealing ring of a cranked shaft; 6 – a back sealing ring of a cranked shaft; 7 - oil pan gasket; 8 – a cover of the radical bearing; 9 - guide pin; 10 - threaded plug; 11 - technological plug
Cylinder block of 4-cylinder diesel engine
1 – block of cylinders; 2 - cylinder sleeve; 3 – a cover of the radical bearing; 4 - oil pan; 5 - front cover of the crankshaft; 6 – a back cover of a cranked shaft; 7 – a back sealing ring of a cranked shaft; 8 - front sealing ring of the crankshaft; 9 - oil pan gasket
Cleaning
Removing the atomizer from the cylinder block
Using a Tap to Clean a Threaded Hole in an Engine Block
1. Remove all parts and electrical sensors from the cylinder block. For complete cleaning, remove process plugs. To remove the plugs, drill small holes in them and screw a self-tapping screw into the holes. Pull the screw head to remove the plug.
2. Remove the oil sprayers on the inside of the piston. To remove the atomizer, unscrew the bolt, remove the sealing ring and remove the atomizer from the cylinder block (see fig. Removing the atomizer from the cylinder block).
3. Install oil sprayers.
4. Remove all traces of gaskets from the mating surfaces of the engine block.
5. Remove all oil line plugs. When installing, use new plugs.
6. Clean the most polluted places with steam.
7. Clean all lubrication holes and oil line. Rinse all internal channels with a stream of warm water until the water comes out clean. It is necessary to completely dry the cylinder block and lubricate all mating surfaces with a thin layer of oil to prevent corrosion. Also lubricate the engine cylinders. If compressed air is available, use it to speed up the drying process and blow out all oil holes and lines.
8. Thoroughly clean all threaded holes using a properly threaded tap, then blow out the holes with compressed air.
9. Install plugs in the oil line in the engine block and fasten them securely.
10. If the engine cannot be reassembled immediately, cover the cylinder block with a large plastic bag to protect it from contamination.
11. Visually inspect the cylinder block for corrosion. Check the integrity of the threads in the threaded holes.
12. Check the diameter of the engine cylinders for wear by the presence of a step at the top of the cylinder.
13. If you have a measuring tool, measure the liner diameter of each cylinder at the top (under the wear step) in the center and at the base parallel to the axis of the crankshaft. Then make the same measurements perpendicular to the axis of the crankshaft and compare them with the technical data. Repeat the measurement procedure on the remaining cylinder liners. If the wear exceeds the allowable values, it is necessary to bore the cylinders and install new oversized pistons.
Checking piston protrusion on diesel engines
1. Check the protrusion of the pistons from the engine block when installing the piston to top dead center, as this is especially important if the surface of the cylinder head has been machined. If the protrusion of the pistons exceeds the allowable limits, the pistons may hit the swirl chamber while the engine is running, causing serious engine damage.
2. Measure the protrusion of the pistons at the level of the upper plane of the cylinder head gasket. If the piston protrusion exceeds the allowable limits, a Mercedes-Benz dealer should be consulted and it is likely that the engine block will need to be replaced.