Noise protection of the diesel engine hood

The noise insulation of the hood is very important, but it is by no means the main objective, aimed at reducing noise in the interior of the car. It should be preceded by a series of works to improve the technical condition of the engine itself, some body parts and suspension.

For many car owners (especially with diesel engines), the noise insulation of the hood with their own hands seems trivial, capable of increasing their prestige and self-esteem. However, often even the use of expensive insulating materials does not yield any results. Therefore, it will be much more prudent to first find out where the strange noises come from. Experts argue that noise can provoke wear of the fuel pump, gearbox, engine cushion, chains or tensioners (if they are in the car).

In this regard, it should be noted that diesel automobile equipment is worth a lot of money, and car owners recklessly use inappropriate tractor or truck diesel, "killing" it with the engine. When measuring the noise level of a diesel engine, already "killed" by half such barbarous fuel (even with the closed windows of the cabin) , the noise level of the windshield is on average 100 dB. Also, in practice, it is established that correctly made noise insulation of the hood (without fixing the malfunctions in the engine) can reduce the noise level to 95 dB, suppressing some sound frequencies, but the overall noise level will not change.

First of all, this is because the noise of the running engine occurs when the fuel pump, the cylinders are malfunctioning, and also in the presence of vibration and exhaust. It will penetrate into the interior through the cracks and holes, available, including, and in the glazing. That's why it is very important to pre-inspect the entire engine compartment and repair all the gaps leading to the interior.

Noise insulation of the hood will not work if there is a backlash between it and the windshield, which produces a sound similar to the singing of a cricket. Hearing it, some believe that this is a sign of damage to the shock absorber. This play is often found in completely new cars. To reveal it, you need to close the hood and pull its veils off the windshield.

It is also important to investigate the condition of the sealing rubber in the doors of the car. If there is no complete sealing, then this is another source of noise not only from the engine, but also from the wheels and air streams. It is very important to pay attention to the insulation of the gaps between the doors and racks. If these factors are not eliminated, the noise insulation of the car's hood will not give the expected effect, and money and time will be wasted.

Only after completing these works, you can begin to isolate the bonnet cover. First, you need to glue between its ribs of stiffness a vibration-proof material, such as, for example, "Vibroplast" or SGM Vibro M2F. Stiffeners do not have rigidity for all cars, so in many cases it is recommended to apply to the hood of SGM Vibro M2F (as a more efficient and lightweight insulation material). The noise insulation of the hood ends with the laying of the main noise-insulating material, such as Isotone LM15 or the Accent produced by Belarus in LMKS.