Cummins/Onan — Muffler Removal
Repair & overhaul · Exhaust system
From a Cummins/Onan service manual covering: C25 D6, C30 D6, C35 D6, C40 D6, C50 D6, C60 D6. Check it applies to your exact model before use.
Applies to: Cummins/Onan C25 D6, Cummins/Onan C30 D6, Cummins/Onan C35 D6, Cummins/Onan C40 D6, Cummins/Onan C50 D6, Cummins/Onan C60 D6, Cummins/Onan 4BT3.3 engine, Cummins/Onan 4BT3.3-G5 engine, Cummins/Onan 4BT3.3-G7 engine
Before you start
- Exhaust pipes and mufflers are very hot; allow to cool before removing.
Procedure
- Remove bolts from top panel (1); torque 9.8 to 11.9 Nm.
- Remove top panel (1).
- Slide end panel (2) up to unlatch, then pull it off.
- Remove the three clamps; torque 24 to 29 Nm.
- Remove the two bolts from each end of the muffler.
- Remove the exhaust pipes from the muffler.
- Remove the muffler from the enclosure.
Tools required
- Torque wrench Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Top panel bolts 9.8 to 11.9 Nm
- Clamps and bolts 24 to 29 Nm
Full service-parts list: Cummins/Onan C25 D6 →, Cummins/Onan C35 D6 →, Cummins/Onan C50 D6 →, Cummins/Onan C60 D6 →
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.