A clever solution to the truck's exhaust brake problem

Abstract:

Frequent use of the exhaust brake makes it difficult to damage the headstock. This is a common problem for many truck drivers. I consulted with experienced drivers, and some believe that the exhaust brake should be designed this way. […]

Frequent use of the exhaust brake makes it difficult to damage the headstock. This is a common problem for many truck drivers. I consulted with experienced drivers, and some believe that the exhaust brake should be designed this way. This is because the pressure generated by the engine's working stroke is much higher than the negative pressure generated by the exhaust brake.

Other experienced drivers believe that the exhaust brake blocks the stable discharge of exhaust gas, and the resulting high pressure makes it difficult to "damage" the exhaust manifold gasket. This does happen in actual use. So why does this problem occur?

It is mainly because many truck drivers are impatient. When the vehicle reaches the top of the slope, the engine temperature is low, and the exhaust gas temperature is also very low, resulting in very low temperatures when it is transmitted to the exhaust pipe and other components. Impatient truck drivers often apply the exhaust brake immediately after starting downhill. However, due to the relatively low temperature at this time, the exhaust manifold gasket is less likely to burn. This is what we commonly call exhaust brake burnout. While improper operation may not be the only cause of exhaust manifold gasket damage, it is only one of the causes.

Proper technique can solve this problem: Engage in a low gear and brake first.

Many people who encounter this problem often complain about the quality of their engine, radiator, and other components, but fail to reflect on whether they are operating the vehicle correctly. This problem can be avoided by using the correct technique when descending.

The correct technique when descending is to first engage the brakes in a high gear, allowing the engine to stabilize (without spraying fuel or with only a small amount of fuel at this time) to dissipate the significant heat generated by the high load on the uphill drive, and then reapply the exhaust brake.

Applying the exhaust brake at a relatively low engine speed generates minimal pressure, which is one of the causes of exhaust manifold gasket burnout. Therefore, we can activate the exhaust brake switch when the engine speed is relatively high (within 1500 rpm) and gradually increase the pressure. This will gradually increase the pressure in the exhaust manifold, which will significantly reduce the damage to the exhaust manifold gasket.

Good driving habits can significantly improve operating efficiency. I still want to remind everyone to pay attention to your driving style during normal driving. With some practice, you may find that your "old friend" may not have as many problems as before.