Cummins/Onan — Muffler and Spark Arrester Service
Maintenance · Exhaust System
From a Cummins/Onan operator's manual covering: 2.0 EGHAM, 2.5 EGHAA, 3.5 EGHEM, 4.0 EGHAB, 4.0 EGHEB, 5.0 EGHAB, 5.0 EGHEB, 5.0 EGHEM, 6.0 EGHEB. Check it applies to your exact model before use.
Applies to: Cummins/Onan 2.5 EGHAA, Cummins/Onan 4.0 EGHAB, Cummins/Onan 5.0 EGHAB, Cummins/Onan 5.0 EGHEB, Cummins/Onan 6.0 EGHEB, Cummins/Onan Elite E140H engine, Cummins/Onan GH170 engine
Before you start
- A hot muffler can cause severe burns.
- Most part cleaning solvents are flammable; work in a well ventilated area and keep an ABC fire extinguisher nearby.
Procedure
- Allow the generator set to cool down before servicing the muffler.
- Inspect the muffler for corrosion and physical defects.
- Operate the set and check for exhaust leaks and noisy operation; replace a noisy or defective muffler.
- Remove the spark arrester screen and inspect for damage; replace if defective.
- Clean by lightly tapping the screen and cleaning deposits with a wire brush; use commercial solvent if necessary.
- Allow screen to dry, then reassemble and attach securely.
Tools required
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Source: Cummins/Onan operator's 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.