Engines

Engines

In connection with the repair or replacement engines, the term part engine is often used. This is a part of the engine in various stages of expansion, which is completed with the components of your vehicle. In most cases, the sub-engine is used as a replacement engine if the functional ancillary units are still present in the vehicle. When it comes to our engines, we're talking about different expansion stages.

• Engine Block nacked: The pure engine block without crankshaft, pistons or attachments
• Short Block: engine block with crankshaft, connecting rods, pistons and bearings.
• Short Block closed: engine block with crankshaft, connecting rod, piston, bearing shells and closed with an oil pan
• Long Block open: engine block with crankshaft, connecting rod, piston, oil pan and cylinder head
• Long Block closed: engine block with crankshaft, connecting rod, piston, oil pan and complete cylinder head and valve cover
• Long Block closed with engine control: Closed partial motor including motor control
• Long Block closed with engine control and injection system: Closed sub-engine including engine control and injection system

Please note the possibly different item description!

Motors in motor vehicles: how they work and differences 

The engines that can be found in classic automobiles are tried and tested 4-stroke engines that work in four steps, namely intake, compression, working and exhaust. A classic 4-stroke engine works as follows: As the piston moves down, a mixture of gasoline and air is sucked in. The piston then moves up again to compress the mixture. The spark plug causes an explosion, so that the piston is pushed down forcefully. In the last step, the burned exhaust gases are emitted again. The inlet and outlet of the mixture as well as the exhaust gases are regulated by the valves, which are controlled by the camshaft. This process takes place in all cylinders.A diesel engine works on a similar principle; this is also a 4-stroke engine. However, there is one important difference: a diesel engine does not have a spark plug because it is designed as a "compression ignition". The explosion is caused solely by the compression created by the rising piston. In the case of gasoline engines (petrol), a distinction is still made between the type of construction. Porsche is known, for example, for the boxer engine. In this type of engine, the cylinder banks are arranged opposite one another, so that the pistons move in opposite directions. In-line engines are installed in most vehicles. All cylinders are in a row. V-engines are also used, in which the cylinders are divided into two cylinder banks that stand together like a V.

Why can an engine be damaged? 

There are a variety of causes that can lead to engine damage. This includes disregarding maintenance intervals, which can result, for example, in a broken toothed belt. In this case, the camshaft stops and the valves no longer open or close. However, the crankshaft continues to rotate so that the piston hits the valve. Damage occurs. Furthermore, incorrect fuel or a low oil level can be the cause of engine damage. If the cooling system leaks and the drive unit gets too hot, the cylinder head gasket can be damaged. Then cooling water gets into the combustion chamber, so that the engine can be damaged if used for a long time.Failure to comply with the prescribed oil change intervals can also lead to engine damage in an engine.In addition, overheating leads to the oil film tearing away, so that the necessary lubrication is lost. In addition, the drive will be damaged if the speeds are too high. If, for example, a switch occurs, i.e. the wrong gear is engaged, the unit over-revs. In this case, strong forces act that lead to damage to pistons or valves. Care must also be taken when driving through deep waters: If the water gets through the air filter into the combustion chamber, this problem inevitably leads to a water hammer in which the connecting rods can bend or the pistons can break, since water is incompressible in comparison to the air-fuel mixture. In some cases, engine fatigue is also responsible for engine damage.  

How can engine damage be repaired? 

A replacement engine does not always have to replace the damaged engine. Engine damage does not necessarily have to mean the end of the engine's life. Some damage can be repaired. The correct procedure depends on the damage to the engine. Every repair begins with the dismantling and cleaning of the engine and its parts. Wear parts that cannot be repaired are replaced with new parts. With the help of special procedures, the parts, including the cylinder head and engine block, are examined for fine cracks that can lead to leaks. A vacuum test checks whether the valves are still tight and whether compression is building up. If in doubt, planning can help restore the surface pressure between the engine block and the warped cylinder head after overheating. The cylinders can be repaired in various ways, depending on the condition and coating of the cylinders. If the cylinder liners are more severely damaged, the cylinders are milled to oversize or new liners are used. In any case, the cylinder liners are honed to ensure that the piston runs optimally. The auxiliary units, such as the turbocharger, cooler or fuel pump, are not to be forgotten during repairs. They are checked and, if in doubt, replaced. If damage occurs in which metal chips form, add-on parts such as the oil cooler must also be replaced, as the chips in the repaired engine can lead to damage again.