EXHAUST SYSTEM The muffler and the exhaust pipe are connected to the turbocharger exhaust elbow (fig. 34) and provide a path for engine exhaust gases to exit the generator set. The muffler reduces the noise level of the engine exhaust. The discharge opening of the muffler is covered by a hinged cap to prevent water from entering the exhaust system when the generator is not operating. Let's look at an example of an indoor installation. After bolting the generator set to the concrete pad and enclosing it in a shelter, you are about to vent the exhaust system to the outside. You lift the exhaust cap (fig. 3-4) and connect the gastight exhaust pipe to the discharge opening. You then extend the pipe through the wall (or roof) of the building in a route that includes no obstructions and a minimum number of bends. If you have arranged the pipe to slope away from the engine, condensation will not drain back into the cylinders. If the exhaust pipe has to be installed so that loops or traps are necessary, place a drain cock at the lowest point of the system. All joints must be perfectly tight; and where the exhaust pipe passes through the wall, you must take care to prevent the discharged gas from returning along the outside of the pipe back into the building. Exhaust piping inside the building must be covered with insulation capable of withstanding a temperature of 1500 F.

Figure 3-4.- Exhaust and breather system.

The crankcase breather tube (fig. 3-4) is clamped to the engine breather assembly. The breather tube provides a path for engine crankcase vapors to exit the generator set. A rain shield is provided at the tube outlet to prevent rain from entering the tube when the generator is used outdoors.