Page 194 - Automobile Mechanical and Electrical Systems Automotive Technology Vehicle Maintenance and Repair (Vehicle Maintenance Repr Nv2) by Tom Denton

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178 Automobile mechanical and electrical systems

Figure 2.195 Baffl e silencer

Figure 2.196 Absorption silencer

Figure 2.197 Flange connections

Clamp fi ttings are used where pipes fi t into each other ( Fig. 2.198 ). The larger
pipe is toward the front and the smaller pipe fi ts inside. A ring clamp, or ‘U’ bolt
and saddle, are tightened around the pipes to give a gas-tight seal. An exhaust
paste is usually applied to improve the seal of the joint. The exhaust system
must be sealed to prevent toxic exhaust gases from entering the passenger
compartment.
The exhaust is held underneath the vehicle body on fl exible mountings ( Fig.
2.199 ). These are usually made from a rubber compound and many are formed
Key fact as a large ring that fi ts on hooks on the vehicle and the exhaust-pipe brackets.
Other mountings are bonded-rubber blocks on two steel plates ( Fig. 2.200 ).
Heat shields are fi tted to the exhaust,
or to the vehicle fl oor, to prevent the Heat shields are fi tted to the exhaust, or to the vehicle fl oor, to prevent the
ignition of sound-deadening and ignition of sound-deadening and anti-corrosion materials. Catalytic converters
anti-corrosion materials. become very hot during operation. It is important, therefore, that all heat
shields are correctly fi tted and positioned to insulate the vehicle from the high
temperature of the catalytic converter ( Fig. 2.201 ).