Repair and restoration of engine block.

Car engine block restoration.
The restoration of the cylinder block is based on the replacement of the factory-installed engine cylinder liners. In turn, cylinder blocks, which are cast together as one whole, can be shelled, turned, honed, as well larger repair pistons could be used.
With such solutions, engine block repair is much cheaper than buying a new engine block. A well-restored cylinder block serves as well and as long as a new one. In the case of classic cars, it is important to keep the original factory engine block of the car with its number. The value of a classic car is significantly reduced due to the fact that the original number block has not been preserved. High-level specialists, thanks to modern equipment and the latest technologies, will help to solve all possible problems related to engine overhaul as soon as possible.

Block turning
In cooperation with partners we perform precise turning of engine blocks, units and other parts. In diameter from 70 to 400 mm.
Block turning is a very delicate process that requires not only knowledge and experience, but also appropriate high-tech equipment. By carrying out such a procedure with non-compliant equipment or entrusting it to amateurs, you run the risk of poor quality work, which will later adversely affect the operation of the engine and its resources.
We offer all engine block repair operations, including initial diagnostics, aligned surface grinding, high-precision turning, honing, as well as plato-honing and other operations.

Restoration of the seat of the main bearings of the cylinder blocks.
Often, when repairing an engine block, it may be necessary to restore the block’s main bearings location and surface it adheres to.
This can be caused by engine overheating, low oil operation, crankshaft wear and curvature. All these factors are interrelated.
Due to the insufficient oil level, the engine did not cool properly, because in addition to lubricating the parts, the oil acts as a coolant. As a result, the rod beaings overheat, the seat seats of the block’s main bearings also overheat, the covers deform, as a result of which the crankshaft can get stuck in the inserts. In this case, the seat of the block main bearings needs to be repaired. Not only the engine block but also the engine head and other components will be deformed as a result of the engine overheating. Possible solutions: cylinder block repair, engine head repair, etc.

Honing of cylinders and shells.
We offer very precise honing of cylinders and shells, also plateau from 70 to 250 mm in diameter, up to 500 mm in engine blocks and other units. The works are performed on the ROTTLER H85A (ASV) CNC honing machine.
Honing is one of the most precise ways of drilling hollow circular shapes. Different types of diamond and abrasive tips are used for honing. In the process of honing processing, high accuracy of bore geometry and the required surface roughness are achieved. When honing with a ROTTLER H85A machine tool, the cylinder geometry is automatically controlled and adjusted. This results in a much more accurate opening compared to other honing machines or grinding methods. Thanks to the wide selection of honing stones compared to grinding wheels, it is possible to perform tasks more accurately in accordance with technical requirements and achieve the best results. Through honing it is possible to obtain the necessary micro-relief, groove indentation, immersion and peak ratio (plateau honing), opening of graphite layers in cast iron is achieved. All this is not possible with conventional grinding.

Plato honing of cylinders,
Plato honing or flat surface honing – is known from long ago, still from aviation piston engines. The idea is also found wider application in the automotive engine industry. As a result of classical honing, we obtain a microplate of the cylinder work surface, which resembles a mountain range with sharp points. During the initial period of operation (on approach), these protrusions level out until sufficiently large bearing surfaces are formed. It is much more logical to immediately reach a surface as a result of the treatment, which ensures the continued correct operation of the engine.
Highly precise machining of engine cylinder and shell geometry provides micro-relief for further work, as a result of which the engine shell and piston rings work faster, in general, parts wear less. As a result of fast operation, the compression in the cylinders increases, oil consumption decreases, gas leakage into the crankcase. All this has a positive effect on the use of engine resources until the next overhaul. The honing the flat surface using honing machine ROTTLER H85A with computer control.

High-precision grinding and balancing flywheels and other parts