About Common Engine Problems

[Why do you love to use Cummins engines regardless of domestic and imported trucks? What’s so good about it?]

Cummins Technology Center not only has strong engine technology development capabilities, but also has strong vehicle engineering development capabilities. As an independent engine manufacturer, Cummins has industries in 190 countries and regions around the world, and has cooperated with almost most of the truck manufacturers on the planet. The European and American markets include Freightliner, Peterbilt, Navistar, and Volvo. , Scania, Mercedes-Benz, etc.
The layout of the domestic market is also more complete. There are 6 pure engine joint ventures, including truck engine factories that we are familiar with, such as Dongkang, Fukang, Xikang, and Ankang. At the same time, Cummins has also established domestically. Manufacturers of engine units, engine parts, etc. have formed a relatively complete production chain.
It can be said that Cummins has obtained a large amount of experience and engineering data through cooperation with this series of OEMs, and these data can support the research and development of Cummins engines and the ability to speed up localization adaptation, ensuring that Cummins can be used in every region. Adjust products that are adapted to the local area.

[Why is Cummins the truck driver’s favorite engine?]

① Reliable and durable: Cummins National VI engines have accumulated more than 20 million kilometers of actual road tests to ensure reliability and worry-free in practical applications;
② Clean and environment-friendly: Cummins National VI engine realizes improvement of fuel efficiency while reducing emissions;
③ Efficient and safe: all series of products apply engine braking technology;
④ Easy to use: Cummins National VI products achieve a long service cycle, and at the same time support functions such as remote intelligent diagnosis and remote calibration upgrade.

[Why is Chongqing Cummins engine so famous?]

Chongqing Cummins Engine Co., Ltd. is a joint venture with Cummins Corporation of the United States. It mainly produces three series of high-speed, high-power diesel engines and marine power units imported from Cummins Corporation of the United States with world-leading levels of N, K and MII. The power coverage is 145/1343KW.

Chongqing Cummins generator sets are widely used in power supporting fields such as trucks, buses, construction machinery, petroleum machinery, Cummins generator sets, ships and rail vehicles. Its advanced economy, power, reliability, durability and environmental safety are generally welcomed by users at home and abroad.
The technology of Chongqing Cummins Engine Co., Ltd. develops simultaneously with Cummins Corporation of the United States. It has passed the ISO9001: 2000 international quality certification audited by BVQI in France. It has been rated as one of the top 50 industrial enterprises in Chongqing for eleven consecutive years.
As the world’s number one diesel engine brand, “American Cummins” adopts the “building block” design mode and integrated design principles to integrate multiple functional parts into one part. One piece has many functions, just like an electronic integrated circuit. Advanced technology has created Cummins’ high quality, compact body size, 40% fewer parts than ordinary generators, and 20%-30% lighter weight than ordinary generators. Adopt Bosch Ve pump with cold start advance device, good reliability. Low fuel consumption. Lean matching also makes Cummins diesel generator sets significantly fuel-efficient, with an average fuel saving of 20%-30% compared with common brand units.
The point is that Chongqing Cummins generator sets are not only energy-saving and environmentally friendly. Dongguan Kangchai Electromechanical Equipment Co., Ltd. is the official authorized generator complete assembly production base of Cummins in the United States. The company has strong technical strength, a global network of spare parts and diesel generator set procurement system, currently has many branches, and is a modern high-tech enterprise integrating R&D, production, sales, maintenance and engineering.

[Is the Cummins engine good?]

Chongqing Cummins Engine Co., Ltd. is a joint venture with Cummins Corporation of the United States. It mainly produces three series of high-speed, high-power diesel engines and marine power units imported from Cummins Corporation of the United States with world-leading levels of N, K and MII. The power coverage is 145/1343KW.
Chongqing Cummins generator sets are widely used in power supporting fields such as trucks, buses, construction machinery, petroleum machinery, Cummins generator sets, ships and rail vehicles. Its advanced economy, power, reliability, durability and environmental safety are generally welcomed by users at home and abroad.
The technology of Chongqing Cummins Engine Co., Ltd. develops simultaneously with Cummins Corporation of the United States. It has passed the ISO9001: 2000 international quality certification audited by BVQI in France. It has been rated as one of the top 50 industrial enterprises in Chongqing for eleven consecutive years.
As the world’s number one diesel engine brand, “American Cummins” adopts the “building block” design mode and integrated design principles to integrate multiple functional parts into one part. One piece has many functions, just like an electronic integrated circuit. Advanced technology has created Cummins’ high quality, compact body size, 40% fewer parts than ordinary generators, and 20%-30% lighter weight than ordinary generators. Adopt Bosch Ve pump with cold start advance device, good reliability. Low fuel consumption. Lean matching also makes Cummins diesel generator sets significantly fuel-efficient, with an average fuel saving of 20%-30% compared with common brand units.
The point is that Chongqing Cummins generator sets are not only energy-saving and environmentally friendly. Dongguan Kangchai Electromechanical Equipment Co., Ltd. is the official authorized generator complete assembly production base of Cummins in the United States. The company has strong technical strength, a global network of spare parts and diesel generator set procurement system, currently has many branches, and is a modern high-tech enterprise integrating R&D, production, sales, maintenance and engineering.

[Advantages and disadvantages of Cummins engine]

Disadvantages: In fact, people who use them generally think that there are few disadvantages for imported engines. If you insist on the disadvantages, it is that if maintenance and repairs are required, the cost of Cummins engine parts is very high. Sometimes the car just When starting, there may be slight blue smoke occasionally, and after the engine has been used for a long time, there may be a phenomenon that the ignition will not come out. Advantages: The biggest advantage is less whistle, low fuel consumption, durable, and not easy to break down. Simply put, the quality of Cummins is very good. It is worthy of the trust of users. In fact, everyone who uses it knows that the engine is like the human heart. The simple manifestation of the quality of the engine is that it is best to turn the number of revolutions in a few seconds when stepping on the accelerator, and at the same time require good acceleration performance.

[Why doesn’t the crankshaft turn when the engine starts?]

1. If the flywheel has more than three consecutive teeth damaged, and it is exactly opposite to the starter teeth, the two gears will not be able to mesh. In this state, just use a crowbar to pry the flywheel to an angle, and then press the start button to start smoothly. For damaged flywheel teeth, welding can generally be used to repair them.
2. When the ring gear is loose, it can be confirmed from the starter installation port of the flywheel housing. If the ring gear is loose, it must be replaced with a new one. When installing, heat the ring gear in a heating box   first, then press it on the flywheel while it is hot, and fasten it on the flywheel after cooling.
3. When the teeth of the ring gear are severely worn on one side, the ring gear can be pressed down, and the front and rear end faces can be turned over before being installed on the flywheel for use.
4. After checking that the gear meshes normally, and the flywheel does not rotate when starting, it should be regarded as an internal fault of the engine, such as crankshaft locked, piston sticking to the cylinder, clutch sticking, etc., which should be further observed. You can first check whether the clutch is damaged and stuck, and then check whether the plunger of the fuel injection pump is stuck and whether there are foreign objects inside the engine and other faults.

[Why does the engine crank when it starts, but it doesn’t start (no smoke in the exhaust)]

1. Check whether the flameout cable of the fuel injection pump returns to its original position.
2. Whether there is oil in the fuel tank and whether the fuel tank switch is turned on.
3. Whether the fastening bolts of the control rod of the fuel injection pump and the drive connection plate have fallen off.
4. Loosen the air release screw on the fuel injection pump, pump oil with the hand pump to exhaust air.
5. Check the oil pipe for air leakage or blockage.
6. Check the fuel filter and oil-water separator for clogging.
7. The starter drives the engine to rotate, check whether the fuel pump pumps oil.
8. Loosen the fuel inlet pipe joint of the fuel injector, push the throttle to the bottom, press the starter switch, and check whether the fuel injection pump is pumping oil. If it does not pump oil, it means that the oil quantity adjustment lever is stuck in the fuel stop position (that is, the rack hairpin); If it is an A-type pump, the side cover of the fuel injection pump should be removed to check and troubleshoot; if it is a P-type pump, etc., corresponding measures should be taken.
9. Check whether the gas distribution timing is correct, if not, adjust it.
10. For an engine equipped with a VE pump, check whether the fuel cutoff solenoid valve and the control circuit are faulty. When it is confirmed that the oil cut-off solenoid valve is damaged, and a new solenoid cannot be found immediately to replace it, the emergency measure of dismantling the solenoid valve, taking out the plunger valve and spring and reinstalling it as it is, and taking power-off treatment to the solenoid valve (this method cannot Electric flameout, you can manually flameout).

[Why is it difficult or impossible to start the engine, and the exhaust pipe emits a lot of white smoke]

1. Use your hands to approach the outlet of the muffler of the exhaust pipe. If the hands are wet and there are water drops, it is confirmed that water has entered the cylinder.
2. Check whether there is water in the diesel oil. Check to see if there is a lot of water in the oil-water separator, if there is a lot of water, the fuel quality is poor. First of all, the water in the high and low pressure oil circuits should be removed; then the drain plug of the fuel tank should be opened to drain the water in the fuel tank, and finally the fuel tank should be flushed with clean diesel oil.
3. Open the water tank cover, press the starter button and observe whether there are bubbles on the water surface of the water filling port.
If there is water in the engine oil, or bubbles emerge from the water surface of the water inlet, it means that the cooling water has entered the cylinder.
4. Before disassembling the cylinder head, check the tightness of each bolt. If there are loose bolts, tighten them and check for water leakage. If there is still water leakage, proceed to the next step of inspection.
5. To further find the specific leaking parts, inflate the water tank with air, the pressure is not greater than 200kPa, open the oil pan, and check the leaking place at the bottom of the engine; then open the cylinder head to check the bottom of the cylinder head and the cylinder head gasket, and check the faulty part. For parts that leak water into the cylinder, replace them for repair or replace them with a new assembly