Cummins/Onan — Exhaust Tailpipe Installation
Installation · exhaust system
From a Cummins/Onan service manual — check it applies to your exact model before use.
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Before you start
- Do not use flexible exhaust tailpipe since it can leak or break due to road shock or vibration.
Procedure
- Use 1-1/2-inch O.D. (1-3/8-inch I.D.) 18 gauge aluminized or stainless steel tubing for tailpipe.
- Use U-bolt type automotive muffler clamps marked 1-3/8 and double rubber U-shaped shock mounted hangers.
- Attach one or more tailpipe hangers every 2 to 3 feet (0.6 to 0.9 m) of tailpipe run if extends beyond 1-1/2 feet from muffler.
- Extend tailpipe minimum 1 inch (25 mm) beyond vehicle perimeter.
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.