Cummins/Onan — Muffler Disassembly
Maintenance · Exhaust system
From a Cummins/Onan service manual covering: 1.4 EGPAA, 1.7 EGPAA, 2.0 EGHAM, 2.0 EGPAB, 2.5 EGHAA, 2.5 EGPAB, 3.5 EGHEM, 3.5 EGPAC, 4.0 EGHAB, 4.0 EGHEB, 4.0 EGPAC, 5.0 EGHAB…. 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 GH170 engine, Cummins/Onan GH280 engine, Cummins/Onan Elite E140H engine
Before you start
- Exhaust gas hazard; do not operate with any exhaust leaks.
Procedure
- Allow set to cool before servicing.
- Remove heat shield covering exhaust pipe and engine.
- Remove mounting nuts securing muffler flange to engine.
- Remove screws securing muffler to support bracket and generator flange; remove exhaust gasket.
- Install new exhaust gasket and muffler; tighten hardware to specified torque.
Tools required
- wrenches Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
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.