Does Citroën Sega have a wastegate?
The Citroën Sega wastegate is inside the right front wheel fender. You can see it by removing the fender lining.
Oil smell (exhaust smell): The valve chamber gasket is aged and leaking, the crankcase exhaust pipe is broken and leaking, the air conditioning filter element is dirty, and the throttle valve is dirty.
Gasoline smell: The carbon canister and solenoid valve are broken, and oil is leaking from the top of the fuel tank.
Exhaust smell: The exhaust pipe is rusty and has holes.
Coolant smell (floor mat leaking): The heater water tank is broken, or the sealing ring is aging and leaking.
Waste gas valve is also called oil separator and pressure control valve. Installed between the compressor outlet and the condenser inlet, it improves heat transfer in the condenser and evaporator through separation.
For systems with poor mutual solubility between lubricating oil and working fluid, oil separators are even more important.
The working principle of the waste gas valve: After the high-pressure gas (gaseous working fluid and lubricating oil) from the compressor enters the waste gas valve, it enters the guide blade of the waste gas valve and flows spirally along the guide blade by centrifugal force. and gravity, the lubricating oil is separated from the working fluid gas and left along the inner wall of the cylinder.
The working fluid gas is led out of the waste gas valve from the central pipe through the multi-vacuity baffle. The separated lubricating oil is concentrated in the lower part of the oil separator and can be discharged regularly, or the float valve can be used to automatically return the lubricating oil to the crankcase of the compressor.
When the reciprocating engine is running, because the piston ring is not completely airtight, a small amount of working gas enters from the gaps between the cylinder wall and the piston ring, and between the piston ring and the piston. Engine crankcase. In order to prevent the diesel engine's blow-by exhaust gas from being directly discharged into the atmosphere, a closed forced ventilation system must be considered during the development process of diesel engine emission upgrades.
Crankcase exhaust is solved through a closed system, that is, forced crankcase ventilation, that is, the bypass gas containing impurities is introduced into the pipe between the engine's air filter and the supercharger intake pipe. There are still problems with this measure: after using forced crankcase ventilation, the system returns the engine blow-by gas to the intake pipe and enters the cylinder with fresh mixture for combustion.
Because the blow-by gas contains a large amount of engine oil droplets, the engine oil cannot be completely burned, which has a negative impact on emissions. In addition, the engine oil cannot be effectively separated and flows back to the oil pan through the oil return pipe, which also causes the loss of engine oil.