This article will tell how correct their own to diagnose major engine parts car Ford Focus, as well as repairs. Let's start with the important procedures like checking compression. From the instruction manual, it is clear that compression has a maximum value of 10 kPa in the case of petrol engines and 24 kPa for diesel units. In principle, the compression can be measured on its own, but still without an assistant you can not do. Your partner must rotate the crankshaft using a starter. The first thing you should do – is to unscrew the spark plug installed in the cylinder head, make sure that the valve is properly exposed. Compression check on the gasoline engine is different from checking the compression on diesel. In the first case, ask your assistant to press and release the two pedals: clutch and accelerator. In the second case to press the accelerator pedal is not needed.
According to the manual measurements of compression should be carried out in 1 in 60,000 miles. This is understandable when you consider the physics of the combustion process in the cylinder. Items such as pistons, cylinder liners, rings, pistons, head gasket are subject to wear due to the large mechanical and thermal effects. Your engine is defective, if: a systematic run poorly, spending more than the usual fuel and oil, he heats up, decreasing its capacity.
During planned or unplanned repair your car may be necessary to check the state of the cylinder head. All you need to lekalnaya line. Before going to measure, clean the surface of the cylinder head. Measure the distance along the line of the head and on its diagonal. Be sure to check the valve seats, as they are worn out, and if the wear is not too strong, the valve seats enough to recover. Despite the fact that this work is quite capable to perform, and myself, we recommend that you contact the experts at the workshop.
Testing and measurement is performed in the piston. First, remember that in any case impossible to clean the surface of the piston with sandpaper or wire brush. Inspect the piston visually, drawing attention to the shirt, the bottom, as well as grooves for the rings: are you looking for traces of scratches and wear. To measure the diameter of the piston you will need a micrometer, which is in the process of measurement must rotate by 90 degrees. Valid values for roundness piston can be found in the manual operation.