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Products
Cummins diesel engine exhaust turbocharger / supercharger repair kit


Detailed Description:

Cummins diesel engine turbocharger physical map and parameter models are for reference only: please contact our sales online customer service for specific price models,

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Cummins diesel engine supercharging principle and maintenance technology

Cummins diesel engine booster system:

Cummins diesel engine turbocharger nameplate:

A = turbocharger component number, B = turbocharger serial number, C = customer part number, D = turbocharger model,

Cummins diesel engine Holes HX series turbocharger:

Cummins diesel engine supercharger basic structure:

The turbine end of the Cummins supercharger: 1) the turbine casing is connected to the engine exhaust pipe, 2) the exhaust gas drives the turbine impeller in the turbine casing, and 3) the turbine impeller drives the pressure impeller on the coaxial

The compressor side of the Cummins turbocharger: 1) the more exhaust gas passes through the turbine casing, the faster the turbine wheel turns, 2) as the turbine speed increases, the speed of the pressure wheel also increases, so more air passes through the air filter After entering the pressure shell, 3) the faster the speed is, the more air is sucked in, the air enters the pressure shell and passes through the pressure impeller and the expansion area. 4) The pressure impeller and the diffusing area increase the air pressure and press it into the engine

Cummins supercharger lubrication system: 1) the supercharger uses the same engine oil as the engine, 2) the engine oil is used as both lubricating oil and cooling oil, 3) the engine oil is pressurized into the middle shell, 4) through floating bearings and thrust System, floating bearings can rotate freely. 5) An oil film should be established between the floating bearing, the intermediate housing and the shaft, and between the thrust bearing and the fixed sleeve. 6) Dirty oil and blocked oil inlet holes will cause damage to the supercharger. 7) A large amount of heat is generated when the supercharger is running at high speed. Heat is transmitted to the intermediate casing from the turbine end, which is taken away by the oil, which reduces the temperature of the intermediate casing and the bearings.

Cummins diesel engine bypass valve supercharger works:

1) In order to improve the low-speed performance of the engine, a smaller turbine casing must be used to increase the air-fuel ratio at low-speed conditions. As a result, when the engine is in high operating conditions, it will bring too high air pressure and flow, resulting in excessive cylinder burst pressure, increased fuel consumption, and supercharger and engine overspeed.

2) The opening and closing of the bypass valve is controlled by the compressor pressure, so as to obtain a simple variable-flow turbine casing. When the pressure is high, part of the engine exhaust gas is discharged through the bypass valve, so as to improve low speed performance and avoid high speed. The operating cylinder burst pressure is too high.

The role of the bypass valve:

1) Increase low speed torque

2) Prevent the turbocharger from rotating too fast at high engine speeds

3) Improve engine emissions

4) Reduce black smoke at low engine speed

Cummins diesel engine supercharger use and maintenance

Cummins exhaust gas turbocharger works under the severe conditions of high temperature (about 500 ~ C) and high speed (80 000 rpm-160 000 rpm). In order to ensure the service life of Cummins exhaust gas turbocharger, pay special attention to the following when using:

1. The full floating bearings of Cummins turbochargers have high requirements on lubricants.

Diesel oil, and the oil must be clean.

2. The turbocharger turbine should be cleaned and inspected regularly, the rotation of the impellers and rotors and the bearing wear and tear, and the axial and radial clearances should be checked to ensure that the Cummins exhaust gas turbocharger is in good technical condition.

3. According to the instruction manual, the air filter should be cleaned in time to ensure that clean and fresh air is unobstructed. At the same time, pay attention to check the air intake pipe system for leaks. If the filter leaks, some of the air directly enters the compressor and enters the cylinder without filtering, which will cause early wear of the compressor blades, cylinder liners, piston rings and other parts; if the turbocharger leaks, it will reduce or Loss of the supercharging effect, causing the diesel engine to emit black smoke and reduce power.

4. Strict compliance with operating procedures. In order to ensure that the full floating bearings are fully liquid-lubricated at high speeds, immediately after the engine is started, it is strictly forbidden to “bomb” the accelerator pedal to warm up. Instead, it should run at idle speed for 3-5 minutes. The water temperature and oil pressure have reached normal working conditions to avoid the bearing being in a state of oil shortage when sudden load is applied, accelerating the bearing wear or burnout, and even getting stuck or broken. Similarly, if you want to stop the diesel engine, you can't stop it suddenly, but gradually reduce the load to reduce the temperature and speed of the supercharger, and stop it after running for 1-2 minutes at idle speed. During the operation, try to avoid air load and air load to ensure the reliability of the supercharger, extend the service life of the Cummins exhaust gas turbocharger, and ensure the normal operation of the engine.

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