The regular maintenance of an engine makes a decisive contribution to averting damage and thus annoyance through loss of time, value and money. And at Motoren Hildebrandt we take it very seriously. Whether pump acceptance, inspection of crankcase and shafts, pulling pistons or changing injectors, we ensure the performance of your engine.
Of course, we also supply you with wearing parts: From seals to V-belts and pistons to timing chains and cylinder liners, you can have everything from us.
In the first step of the repair, we dismantle the engine into its individual parts and clean it down to the last screw. Then we replace all wear parts with new parts and restore the usable components of the old engine. Advantage: This saves you up to 50% in costs compared to new parts. And since we have almost all parts in stock, time too.
Engine failure - who would want to be in the shoes of a shipowner whose ship is unable to maneuver? Ship engines are complex units in which everything has to be perfectly coordinated. We know how. We are the official service contract partner for Yanmar. Of course, our mobile service technicians are also happy to answer your questions. After all, at Motoren Hildebrandt, competent advice and assistance are part of the mobile all-round service on board. And that worldwide in a 24/7 mentality.
Our offer is aimed exclusively at auto repair shops. Private end customers should contact their trusted car workshop.
The mechanical techniques we use include drilling, honing, grinding, planning, turning, milling and polishing. During honing, for example, the bored out cylinder block is treated with special honing stones. This essentially determines the oil consumption. We make sure that it stays low. But honing has another advantage: The wear and tear remains low and thus the "heart attack risk" of the engine.
What is a general overhaul? Your engine will not be new afterwards, but it will be as good as new. In other words: In our opinion, professional repairs are often better than buying a new one. There is a reason for this, which lies in the complex technical processing.
The engine block performs important tasks for the engine's function. On the one hand, it is responsible for transmitting dynamic forces. On the other hand, it supports the crankshaft and houses the cylinder head and auxiliary components. It's only logical that the engine block must withstand many stresses.
Motoren Hildebrandt designs the sealing surfaces and seating surfaces for the cylinders. This eliminates and prevents damage caused by surface wear. We bore the cylinders to a specific size and then hone them with a machine. During the boring process, we remove unevenness and damage. During the honing process, we ensure adequate oil lubrication of the cylinder and pistons.
Due to the constant movement of the pistons, wear develops over time in the cylinder bores in the engine block. This impairs the engine's function. Furthermore, further damage can occur if the engine is improperly cooled. This can cause pistons to seize up in the cylinders.
We bore and hone the cylinders. This repairs this damage and restores the smooth operation of the engine. Using a special machine, we can precisely adjust the amount of bore-out required. During the bore-out process, we remove damage to the cylinder bore, the running edges, and imbalances. Since this increases the cylinder diameter, we install pistons with a correspondingly larger diameter (oversized pistons). Once we have bored the cylinders, we can install the cylinder liners.
We always hone the cylinders of the engine block after boring. Honing smooths the cylinder surface and gives it a cross-ground finish, which ensures perfect oil retention on the cylinder wall and is essential for the surface's wear resistance. For proper oil lubrication, the cross-grinding lines must be between 35° and 45° to prevent too much or too little oil from sticking. When the cross-grinding is in the correct position, we ensure that the oil is optimally distributed between the cylinders and pistons. Honing the cylinders is therefore a key step in engine repair.
A crack in the engine block may seem dramatic at first. But you don't have to say goodbye to the engine block just yet, as the causes of cracks are diverse. They range from overheating to violent impacts on the engine block. Using different types of welding, the engine block can be restored to functionality. In our workshop, we offer a welding process that has the advantage of enabling precise work with minimal thermal distortion.
A working crankshaft is constantly subjected to high forces. Therefore, it must undergo precise work steps during its repair. We thoroughly clean the crankshaft and then inspect it, even for the smallest cracks. After a hardness test, it is further hardened if necessary. We grind the bearing journals with great precision – naturally according to the manufacturer's specifications – and polish them. Our special machines balance them to ensure extremely smooth running.
With its central function of constant rotation, a crankshaft must function perfectly. Engine operation places very high stresses on it. If, when measuring the crankshaft, we notice that it is no longer within the tolerance range, we correct it by grinding. We also repair the crankshaft with a grinding machine if there are visible scoring or bearing damage.
Polish, measure, grind, replace. The camshaft is an essential element of the engine control system. It is responsible for the precise opening and closing of exhaust and intake valves. Therefore, during engine repairs, we work on the cams and bearings. They are polished, measured, and ground.
The camshaft closes and opens an engine's intake and exhaust valves. It should only be used in perfect condition. Although camshafts normally last a very long time, they occasionally wear out. In this case, the valves can no longer close or open. We then measure and, if necessary, grind the camshaft to correct the defect. A new part can also be used to replace the defective camshaft.
Pistons are responsible for the combustion process. They are therefore an important and essential component of the engine. The energy released in the pistons is converted into mechanical power, which they transfer as rotational force to the crankshaft via the piston pin and connecting rod. Pistons can suffer damage because they are in constant motion and exposed to high temperatures. After we have recoated, balanced, and adjusted the pistons, thus fully repairing the damage, they move perfectly in the cylinder again.
Since pistons are subject to constant, high friction, wear can lead to engine problems. When adjusting the piston, we therefore take great care to ensure that we install the piston and connecting rod correctly in the cylinder and that the piston rings are still intact and fully functional. These seal the piston against the crankcase and dissipate heat from the piston to the cylinder. After expert adjustment and inspection of the piston, the engine's combustion process is restored to 100 percent.
The connecting rod, or connecting rod, connects the piston to the crankshaft and thus also provides the power transmission. It converts the linear up and down motion of the piston into the circular motion of the crankshaft. The constant stress of tension, compression, bending, and buckling leads to wear over time.
We repair connecting rods by honing the bores and replacing the connecting rod bolts, bearings, and bushings. We also check the weight and fully offset the connecting rods to ensure the piston guides straight into the bore and prevent wear in the future.
Cylinder heads perform a complex task. They are responsible for absorbing gas forces, sealing the combustion chamber, lubricating the moving components, dissipating combustion heat, and driving the camshafts. Since the cylinder head is one of the most complex parts of the engine, only flawless cylinder heads are suitable for repair.
We use a variety of procedures to get the cylinder head working again. Professional measuring instruments help us, for example, to professionally inspect the cylinder head for even the smallest cracks. We replace the valves, valve guides, and valve seat inserts. We grind the surface to a perfect flatness. We also check and rework parts such as rocker arms, rocker shafts, bearing bushes, and valve springs. Finally, we press-test the cylinder head to check for leaks.
As a component of the crankshaft drive, the flywheel's job is to compensate for the engine's rotational irregularities and overcome so-called idle strokes and dead centers using the absorbed kinetic energy. Therefore, it is particularly important that it functions properly.
Our flywheel repair services include: cleaning, re-grinding the friction surface, re-grinding the bearing surface, fine balancing, adapting to the clutch, replacing the starter ring gear, and surface grinding.
Valves seal the combustion chamber and ensure optimal gas exchange. They are in constant motion and therefore subject to natural wear.
Before we repair the valves, we naturally clean them. We grind them using a suitable machine. However, if the valves are too damaged, we replace them. This is the case if, for example, they are chipped or burned out.
Diesel injectors are responsible for precisely metering and finely atomizing the fuel into the combustion chambers of the diesel engine, and injecting it according to a precise schedule. Injectors ensure the amount of fuel required for the compression ignition of diesel engines. An injector is an electronic fuel injection system equipped with a common rail system. Defective injectors are primarily noticeable through a loss of engine performance, which is not necessarily immediately apparent. Signs that an injector is faulty can also include starting difficulties, increased fuel consumption, rough idling, or engine knocking.
First, we professionally remove the defective injectors, subject them to a thorough mechanical cleaning, and inspect them for mechanical damage to seals, seats, noses, and threads. Anything that is defective is professionally repaired. Anything that is too damaged is replaced.
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Repairs are worthwhile. It is therefore a matter of course for us to give a guarantee on our services and our components. Minimize your risk of failure! Call us, we look forward to your vote.