2016 Isuzu Truck EXHAUST CLEARANCES If flammable materials such as wood are used in the body, provide at least 3.9 inches of clearance between the body and any parts of the exhaust pipe, DPF/SCR Package. If it is impossible to maintain the minimum clearance, use a heat shield. Also use a heat shield if an oil pump or line is located above the exhaust pipe, muffler or catalytic converter. Figure 2.5.1 1) Clearances around SCR system components must be greater than 1.0 inch at all times to avoid potential contact between the body and the exhaust compo- nents. The 1.0 inch allows for thermal expansion and assembly tolerance of the exhaust system.
It does not account for dynamic movement in the body due to road conditions and other loads. Body companies are instructed to adjust this 1.0 inch clearance as required to account for body displacement while driving. This guidance does not supercede guidance or exhaust clearances for temperature sensitive or flameable components. 2) Exhaust temperatures have not changed since the introduction of DPF in 2007. PAGE 2.5