Section 4
Exhaust & Aftertreatment
4-1
12/11
ExHAUST AND AFTER-TREATMENT INFORMATION
The following section is designed to give you information regarding the exhaust and after-treatment systems on Kenworth
chassis .
All Kenworth’s equipped with 2010 emission level engines will utilize Selective Catalyst Reduction (SCR). SCR is a
process in which Diesel Exhaust Fluid (DEF) is injected into the exhaust down stream of the engine. DEF is converted to
ammonia by the heat of the exhaust system . Inside of the SCR canister a catalyst causes a chemical reaction to occur
between the ammonia and NOx, turning it into water and nitrogen. For more information on the specific details of how
SCR works, please contact your local Kenworth dealer .
DEF System Schematic:
On most Kenworth chassis the DEF Supply Module (or pump) is integrated into the DEF tank . Kenworth does not allow
relocation of this pump . The following schematic details how the DEF lines route to the after-treatment system .
DEF Return Line
(Backflow from
Supply Module)
Coolant Draw
(from Draw Tee)
Detail A
Scale 1:2
DEF Draw Line
(Inlet to Supply Module)
Coolant Return
(to Coolant Valve)
DEF Tank
(10-gallon shown)
See Detail A
DEF Return Line (Backflow)
DEF Draw Line (Inlet)
DEF Supply Module
(Pump)
DEF Pressure Line
(Outlet)
DEF Dosing Module
(Injector)
Summary of Contents for Kenworth T170 Hybrid 2011
Page 1: ...Kenworth T170 T270 T370 and Hybrid 2011 Body Builders Manual...
Page 2: ......
Page 10: ...12 11 Section 1 Introduction Page Intentionally Left Blank...
Page 52: ...Section 3 Dimensions 3 34 12 11 Automatic Transmission Allison 3000RDS...
Page 53: ...3 35 Section 3 Dimensions 12 11 Manual Transmission...
Page 111: ...Section 5 Frame Layouts 5 40 12 11 Page Intentionally Left Blank...
Page 120: ...Section 6 Body Mounting 6 9 12 11 Page Intentionally Left Blank...
Page 128: ...Section 7 Frame Modifications 7 8 12 11 Page Intentionally Left Blank...
Page 165: ...Section 8 Electrical 8 37 12 11 FIGURE 8 31 Cab Load Center mPDC...
Page 170: ...Section 8 Electrical 8 42 12 11 Page Intentionally Left Blank...
Page 179: ...12 11 Kenworth Truck Company P O Box 1000 Kirkland WA 98083 425 828 5000...