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2026
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Exhaust manifold gasket keeps failing? Maybe you made this mistake
A few days ago, a senior student said she was going to open a repair shop and asked truck enthusiasts to gather common problems on trucks and their solutions. A truck enthusiast privately messaged me to chat about issues he had encountered. Although they weren’t particularly difficult problems, they were often overlooked by drivers. One such issue is: 'Does frequent use of the exhaust brake damage the exhaust manifold gasket?'
● Does frequent use of the exhaust brake easily damage the cylinder head gasket?
This is a problem that many truck enthusiasts may encounter. The senior student also specifically consulted some experienced drivers. Some drivers believe that since the exhaust brake is designed this way, it must be fine, because the pressure generated by the engine’s working stroke is far higher than the negative pressure produced by the exhaust brake.
Some experienced drivers also believe that the exhaust brake blocks the normal discharge of exhaust gases, and the resulting high pressure can easily 'damage' the exhaust manifold gasket. In actual use, such things do happen.
● Improper operation is the reason; impatient truckers are prone to this.
So why does this problem occur? It is mainly because many drivers are 'impatient.' When the vehicle reaches the top of a slope, the engine temperature is relatively high, and the exhaust temperature is also very high, causing the temperature transmitted to the exhaust pipe and other components to be very high.
Impatient truck drivers tend to use the exhaust brake as soon as they start going downhill. At this time, due to the higher temperature, the exhaust manifold gasket is easily damaged, which is what we usually refer to as the exhaust manifold gasket being ruined by the exhaust brake. Of course, improper operation is not the only cause of exhaust manifold gasket damage, just one of them.
● Correct Technique Can Solve It: Engage a Lower Gear to Brake First
When many people encounter this problem, they often complain about the engine, radiator, or other components not being of good quality, without reflecting on whether their own operation is correct. If the correct method is used when going downhill, such problems can be avoided.
The correct method when going downhill is to first shift to a lower gear and use the brakes, allowing the engine to operate normally (at this time, no fuel is sprayed or only a small amount of fuel is sprayed), which helps carry away the large amount of heat generated by high-load operation uphill, and then use the exhaust brake.
Turning on the exhaust brake when the engine speed is relatively high will create pressure that is too high instantaneously, which is one of the causes of damage to the exhaust manifold gasket. Therefore, we can turn on the exhaust brake switch when the engine speed is relatively low (within 1500 RPM), allowing it to gradually increase. In this way, the pressure inside the exhaust manifold gradually rises, which reduces the damage to the exhaust manifold gasket.
Good driving habits can effectively improve operational efficiency. A slight lack of attention to driving methods may cause vehicle problems. Everyone should pay more attention to their driving methods in daily driving. After maintaining it for a period of time, you will find that your 'old buddy' may not have so many issues as before.
Focus on the research and development of automotive brake systems and pneumatic brake valves to promote the development of the auto parts industry!
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