GHAB — EXHAUST SYSTEM

For the GHAB.

Procedure

1. Remove the two screws that secure the panel hole cover that is mounted directly below the exhaust pipe and remove panel hole cover (see Figure 5-1).
2. Remove the four screws that secure the muffler support bracket to the top of the generator.
3. Remove the two screws from the two exhaust manifold flanges and remove muffler from heat shield. Be sure to cover the openings in the block to prevent loose parts and dirt from enter- ing the engine.
4. Remove the four screws that secure the bottom heat shield assembly to the top of the generator muffler support bracket.
5. Reassembly is the reverse of disassembly. When installing exhaust manifold, always use new gaskets. Torque all screws according to Thread Torques. MANIFOLD FLANGES MUFFLER SUPPORT BRACKET MUFFLER ASSEMBLY TOP HEAT SHIELD MANIFOLD GASKETS

Source: manual:965-0503B_Onan_GHAB_spec_A_Genset_Engine_Generator__Controls_Service_manual_11-1999.pdf. Figures and steps are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.