Cummins/Onan — Removing the Muffler
Repair & overhaul
From a Cummins/Onan service manual — check it applies to your exact model before use.
Applies to: Cummins/Onan HDKC, Cummins/Onan HDKCA, Cummins/Onan HDKCB
Before you start
- The flexible tube is fragile; take care not to bend or twist it
- Exhaust gas is deadly; the exhaust system must not leak
Procedure
- Disconnect the negative battery cable and remove the top and back housing panels.
- Disconnect the exhaust tailpipe and remove the flanged tailpipe adaptor.
- Remove the flange screws on both ends of the flexible tube and withdraw the tube.
- Remove the screws from the 2 muffler support brackets and the manifold flange.
- Withdraw the muffler.
Specs & values
- Tighten all screws and nuts according to specifications (p. 13-1)
Full service-parts list: Cummins/Onan HDKC →, Cummins/Onan HDKCA →, Cummins/Onan HDKCB →
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.