Our guide covers the removal of the entire exhaust system – using the 1.8/2.0L engine as an example – from start to finish. If individual parts are replaced, only consider the relevant repair stages – in the V6 and turbodiesel versions of the Mondeo, do the same. Consider that screws, self-locking nuts, burnt gaskets and brittle mounting rubber all need to be replaced.
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ORDER OF EXECUTION |
- Place the vehicle on jack stands or a lifting platform.
- First, support the flexible tubes (indicated by arrows) with a protective casing or suitable support material (wood blocks, roof lathing) and pressure bands. If something is twisted during installation, the entire "network" will easily break, the tubes can be considered scrap metal. Therefore, handle them with sufficient care.
- Disconnect the lambda sensor plug and...
- ...then remove the cable strand (indicated by the arrow) in the body floor.
Do not bend, but support: flexible outlet pipe in front of the catalytic converter. |
Don't forget: first disconnect the lambda sensor plug. |
- Now turn the lambda sensor (indicated by the arrow) by the flange.
- Release the flexible tube flange on the front side of the catalytic converter, carefully remove the flange and...
- ...then release the rear connecting flange (arrow). Dispose of the old nuts, gaskets and mounting rubber.
Sealed by two screws: catalyst flange. |
- Hang the "remainder" of the exhaust system from the mounting loops and, together with an assistant, pull the entire installation out from under the "belly" of the Mondeo.
- Installation is carried out in the reverse order. When installing, use copper paste, rub it into the threads and new gaskets. If the unit is partially replaced, the old flange surfaces will need to be treated with sandpaper. The flanges should be tightened, like the lambda sensor, to a torque of 46 N·m. Align the exhaust system under the bottom of the car, test drive and check again whether all working places remain sealed.
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PRACTICAL ADVICE |
How to make sure the system is tight
Every time you repair the exhaust system, you generally need to use new seals and screws: new gaskets are much more flexible and therefore perform their purpose better. A leaky system not only makes noise in its "backyards", but also has a negative impact on the power and parameters of the exhaust gas. Therefore, do not forget to thoroughly work with all sealing surfaces before installation and lubricate the screw threads with heat-resistant copper paste. |
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TECHNICAL DICTIONARY |
What comes out of the exhaust system
Carbon monoxide (CO): is measured during exhaust gas testing. Precise control of the injection flow rate, homogeneous formation of the combustible mixture in the intake tract of the combustion chamber, and the correct ignition timing are the basic prerequisites for "obtaining the required" exhaust gas. Never measure CO indoors - you can get carbon monoxide poisoning! In the atmosphere, carbon monoxide mixes with oxygen, forming harmless carbon dioxide (CO₂). This gas has a significant impact on the greenhouse effect.
Hydrocarbon (HC): does not burn completely in "cold" places and "folded" combustion chambers. The HC component depends on the engine design (unchangeable value). In the presence of a lean or rich combustible mixture, the proportion of HC in the exhaust gas still increases. Together with nitrogen oxides (NOx), hydrocarbons are responsible for the appearance of smog (heavy soluble concentration of exhaust gas in the atmosphere).
Nitrogen oxides (NOx): their share increases at elevated combustion temperatures. For example, in engines designed for low CO and HC output (reduced fuel consumption) (engines for lean fuel mixtures). At high concentrations, nitrogen oxide can harm the respiratory system. In combination with water, they form hydrochloric acid (acid rain).
Sulfur dioxide (SO2): is formed as a result of the presence of sulfur in fuel, and mainly during the combustion of diesel fuel. When exposed to light, sulfuric acid or sulfurous acids are formed. Both compounds contribute to acid rain. Current vehicle agreements specify the formation of sulfuric acids at 3%.
Typical toxins in diesel exhaust gas: Diesel engines produce exhaust gases with low CO and HC content due to their operation. Despite the high compression ratio, they also emit less nitrogen oxides into the atmosphere compared to carburetor engines. However, diesel should not be considered a "clean freak", it produces other problematic combustion products, soot, for example, is a typical representative of exhaust gases in these engines. Soot consists of unburned carbon and ash. Soot particles are inhalable and are considered carcinogenic. At the same time, sulphur dioxide is formed during combustion of diesel fuel - but in a higher concentration than in petrol engines (see the section: Sulfur dioxide). |
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A copy of the article is available on the website FORDBOOK.RU
