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7. Exhaust System
WARNING Accidental or remote starting can
cause severe personal injury or death. Before
removing a housing panel or access door, disconnect
the negative (−) cable at the battery to
prevent the engine from starting.
The muffler is bolted directly to the outlet flange of
the engine exhaust manifold and a flexible, corrugated
stainless steel tube is bolted to the muffler
outlet flange (Figure 7-1). The flange on the other
end of the flexible tube is bolted to a bracket on the
base assembly (Figure 8-1).
Flanged tailpipe adaptors are available for tailpipe
connections out the end, back or bottom of the genset.
See the Installation Manual for important safety
warnings and instructions regarding the routing and
termination of the tailpipe (not supplied by Onan).
Always use new flange gaskets when connecting
exhaust system components.
See Page 3-5 regarding spark arrestor cleaning.
To remove the muffler:
1. Disconnect the negative (-) battery cable from
the battery to prevent the genset from starting
and remove the top and back housing panels
(p. 4-4).
2. Disconnect the exhaust tail pipe and remove
the flanged tail pipe adaptor.
3. Remove the flange screws on both ends of the
flexible tube and withdraw the tube out the end
of the genset.
CAUTION The flexible tube is fragile. Take
care not to bend or twist it.
4. Remove the screws from the 2 muffler support
brackets and the muffler manifold flange and
withdraw the muffler.
Installation of the muffler is the reverse of removal.
Use new flange gaskets for the tail pipe adaptor,
flexible tube and muffler. Tighten all screws and nuts
according to specifications (p. 13-1).
WARNING Exhaust gas is deadly. The exhaust
system must not leak. Liability for injury, death,
damage and warranty expense due to the use of
an unapproved muffler or due to modifications
becomes the responsibility of the person installing
the unapproved muffler or performing the
modifications. Use Onan approved exhaust
system parts.
7-1