2010 Kenworth T440/T470 Body Builder Manual
2010 Kenworth T440/T470 Body Builder Manual
2010 Kenworth T440/T470 Body Builder Manual
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Section 4<br />
Exhaust & Aftertreatment<br />
EXHAUST AND AFTER-TREATMENT INFORMATION<br />
The following section is designed to give you information regarding the exhaust and after-treatment systems on <strong>Kenworth</strong><br />
chassis.<br />
All <strong>Kenworth</strong>’s equipped with <strong>2010</strong> emission level engines will utilize Selective Catalyst Reduction (SCR). SCR is a<br />
process in which Diesel Exhaust Fluid (DEF) is injected into the exhaust down stream of the engine. DEF is converted to<br />
ammonia by the heat of the exhaust system. Inside of the SCR canister a catalyst causes a chemical reaction to occur<br />
between the ammonia and NOx, turning it into water and nitrogen. For more information on the specific details of how<br />
SCR works, please contact your local <strong>Kenworth</strong> dealer.<br />
DEF System Schematic:<br />
On most <strong>Kenworth</strong> chassis the DEF Supply Module (or pump) is integrated into the DEF tank. <strong>Kenworth</strong> does not allow<br />
relocation of this pump. The following schematic details how the DEF lines route to the after-treatment system.<br />
DEF Tank<br />
(10-gallon shown)<br />
DEF Return Line<br />
(Backfl ow from<br />
Supply Module)<br />
DEF Draw Line<br />
(Inlet to Supply Module)<br />
See Detail A<br />
Coolant Draw<br />
(from Draw Tee)<br />
Detail A<br />
Scale 1:2<br />
Coolant Return<br />
(to Coolant Valve)<br />
DEF Return Line (Backflow)<br />
DEF Draw Line (Inlet)<br />
DEF Supply Module<br />
(Pump)<br />
DEF Pressure Line<br />
(Outlet)<br />
DEF Dosing Module<br />
(Injector)<br />
4-1<br />
12/09