Cummins/Onan — Exhaust System Installation
Installation
From a Cummins/Onan service manual — check it applies to your exact model before use.
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Before you start
- Exhaust gas presents hazard of severe personal injury or death.
- Do not connect generator set exhaust to vehicle exhaust system.
Procedure
- Use only Onan UL/CSA tested mufflers with spark arresters.
- Keep exhaust system no closer than 3 inches (76 mm) from combustible material or shield/insulate to limit temperature rise.
- Extend exhaust system minimum 1 inch (25 mm) beyond perimeter of vehicle.
- Try to terminate tailpipe aft of generator set air intake to reduce exhaust recirculation.
- Use 1-3/8 inch I.D. 18 gauge rigid steel tubing for tailpipe.
- Use U-bolt type automotive muffler clamps marked 1-3/8 and double rubber U-shaped shock mounted hangers.
- If tailpipe extends beyond 1-1/2 feet (0.46 m) from muffler, attach an automotive tailpipe hanger for additional support.
- Support exhaust system at or near perimeter of vehicle.
- Mount muffler and tailpipe hanger brackets directly above component supported, not at an angle.
- Do not twist rubber sections of hangers.
- Do not use flexible exhaust tailpipe.
- Do not terminate exhaust under vehicle.
Specs & values
- 3 inches (76 mm) minimum from combustible material
- 1 inch (25 mm) minimum beyond vehicle perimeter
- 1-3/8 inch I.D. 18 gauge rigid steel tubing
Source: Cummins/Onan service manual. Steps and values are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.