Cummins/Onan — Exhaust Installation Guidelines
Installation · Exhaust system
From a Cummins/Onan service manual — check it applies to your exact model before use.
Applies to: Cummins/Onan HDKA, Cummins/Onan HDKAQ, Cummins/Onan HDKAR
Before you start
- Angular mounting of muffler and tailpipe hanger brackets can result in exhaust system damage.
Procedure
- Complete downpipe plumbing from engine exhaust manifold before unit is set in place and secured.
- Install elbow on downpipe, then turn muffler onto elbow; muffler cleanout plug must face downward.
- Attach tailpipe to muffler with U-bolt type exhaust system clamp and hanger; use automotive tailpipe hanger for additional support at perimeter of vehicle.
Tools required
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Full service-parts list: Cummins/Onan HDKA →, Cummins/Onan HDKAQ →, Cummins/Onan HDKAR →
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.