Inspection
Model year 2007 and later diesel engines in vehicles domiciled in the U.S. or Canada are required to meet all EPA exhaust gas emission regulations effective per the applicable emission model year and are equipped with an emission aftertreatment system (ATS).
Vehicles domiciled outside of the U.S. and Canada may not have aftertreatment equipment, depending upon local statutory emissions guidelines.
Important: The aftertreatment device (ATD), which is part of the aftertreatment system (ATS), requires special attention during regularly scheduled maintenance inspections. No leaks are allowed anywhere in the system. If any discrepancies are discovered, refer to the engine manufacturer's service literature for repair instructions. Also see the engine manufacturer's maintenance literature for maintenance procedures not listed here.
- Check for leakage at the clamp that attaches the exhaust pipe to the turbocharger exhaust outlet. If leakage exists, tighten the nut on the clamp to the required torque. If leakage persists, install a new clamp.
- Check the exhaust pipe, bellows, and each exhaust seal clamp for leakage, wear, cracks, or damage. Replace damaged components as needed. If leakage exists at a clamp, tighten the nuts to the required torque. If leakage persists, install a new exhaust seal clamp. Do not reuse seal clamps. Once a seal clamp is loosened or removed, it must be replaced.
- If present, check the condition of the insulation material around the exhaust pipe between the turbocharger and the ATD.
- Check the ATD mounting bands for tightness, if installed. Tighten to 30 lbf·ft (41 N·m) if needed. Do not overtighten.
- Check for leaks around the clamps that attach the ATD in the ATS, and around the clamps that retain the DPF in the ATD.
- Check the DEF tank, pump, metering unit, and lines for leaks. See Section 49.01 of the 108SD and 114SD Workshop Manual for repair procedures.
- Check any wires, lines, or hoses within 4 inches (10 cm) of the exhaust system for heat damage. Repair or reroute as needed.
Note: Diesel exhaust fluid creeps, causing white crystals to form around the line fittings. The presence of crystals does not mean the system has a leak. Replacing fittings or troubleshooting components is not necessary unless there is a system failure or a fault code.