Exhaust gas system (Renault Espace III)

• Hairpins (1, Fig. 1.98) the exhaust pipes of the exhaust system of cars with F3R engines have stops that determine the tension of the springs, so they should be tightened to the stop.

Fig. 1.98. Connection of the exhaust pipe of the exhaust system of vehicles with F3R engines: 1 - hairpin; 2 - ring

Attention: All removed clamps must be replaced with new ones.

Resonator and catalytic converter

• Despite the fact that the resonator is connected to the muffler by a solid pipe, it is possible to replace these elements separately.
• In this case, it is necessary to cut the pipe as follows.
• Remove the resonator-muffler assembly.
• Mark the cutting location.
• The cutting area is marked by two punched dots on the exhaust pipe (on the left or right side of a straight section of pipe).
• The distance between two marks is 90 mm.
• To cut the pipe, you need to draw a line in the middle between the marks.
• The marks may not be visible due to corrosion and dirt, in which case clean this section of the pipe with sandpaper.
• Use the Mot. 1199 tool to cut the pipe. Position the Mot. 1199 tool at the desired location on the exhaust pipe. Loosen the chain as much as possible and wrap it around the pipe and attach the tool to the chain. Rotate the tool around the pipe, tightening the chain as you cut (do not tighten too much to avoid deforming the pipe when cutting).
• Remove the element to be replaced.
• Install and secure the repair pipe. To ensure the tightness of the exhaust system, it is important to install the pipe on the pipes correctly, i.e. so that the pipe rests against the protrusions inside the pipe. First, the pipe is installed on the old pipe and slightly pressed with a clamp.
• Check that the pipe rests against the protrusions.
• Install a new exhaust system component.
• Before installing the pipe, apply a special mastic to the inner ring of the pipe to seal the connection.

Attention. To avoid contact with the body, the clamping bolt with the nut of the branch pipe must be oriented vertically on the left side of the pipe.

• Before finally tightening the nut, you must make sure that the catalytic converter and resonator are securely fastened to the bottom of the car
• Once removed, the clamp cannot be reused.
• The clamp nut has a groove (A. Fig. 1.99), to indicate the correct tightening torque. When the groove disappears during tightening, it makes a characteristic click, this means that the nut has been tightened to a torque of 25 N·m.

Fig. 1.99. Repair pipe of the exhaust system: A - groove that determines the tightening torque of the nut

Note: For vehicles with F3R engines, 50mm diameter pipes must be used.

• Before assembling the unit, make sure there are no contaminants or metal particles in the exhaust pipe up to the resonator
• Replace the gasket at the outlet of the catalytic converter.
• When installing the resonator-muffler assembly, release the catalytic converter-resonator connection to align the pipe.
• After installation, make sure that the pipe does not touch the bottom anywhere.

Note: When working under the vehicle, check that all exhaust system heat shields are present and securely fastened.

Fig. 1.100.Elements of the exhaust system: 1 - exhaust manifold gasket; 2 - exhaust manifold; 3- inlet exhaust pipe; 4 - oxygen concentration sensor; 5 - catalytic converter; 6 - front muffler; 7 - rear muffler; 8 - suspension; 9 - thermal protection screen