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TIM Ellsworth of Isuzu's product planning department provided upfitter considerations:
Component clearance. Design and installation of bodies and/or special equipment should allow for appropriate chassis component clearances. Examples are engine, transmission, prop shaft, axles, wheels/tires, exhaust system, brake lines, and fuel lines. See the Body Builders Guide for recommended clearances per model.
Serviceability. Access to items that require routine service should not be obstructed. Examples are engine oil, coolant, transmission fluid, fan belts, batteries, brake system and fluid, fuel filler, and DEF fill.
"Something I hear quite often is clearance for filling a DEF tank," he said. "Keep in mind there are multiple methods for filling DEF tanks. You have the standardized pump method and also the funnel and jug method."
Diesel coolant lines. All Isuzu diesel trucks MY2011-plus emissions use engine coolant heat to meet DEF thaw guidelines. Auxiliary heaters may not draw heat from engine coolant. Energy used for auxiliary heating may increase DEF thaw times beyond acceptable guidelines. Auxiliary heaters must contain a self-contained heat source.
Diesel emission devices. No-modification zones: DEF tank, DEF lines, coolant lines, exhaust aftertreatment. Modification may cause calibration issues and void emissions compliance.
Special bolt placement. Body-mounting bracket on right-hand chassis rail. Reinforcement block with U-bolt on left-hand chassis rail....