Cummins/Onan — Compartment Construction
Installation
From a Cummins/Onan service manual — check it applies to your exact model before use.
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Before you start
- Fire hazard: do not position muffler directly below a drain hole.
- Exhaust gases: make compartment walls vapor-tight to vehicle interior.
Procedure
- Install generator set in its own compartment.
- Separate compartment area from living quarters and any fuel supply with a vapor-tight wall.
- Line compartment walls with 26-gauge galvanized steel or material of comparable strength, durability, and fire resistance.
- Construct compartment floor to prevent oil, fuel, or water accumulation; use 1/2 inch (13 mm) diameter drain holes.
- Do not position muffler directly below a drain hole.
- Do not use absorbent sound proofing material on compartment floor.
- Equip base with an oil drain hole to outside of compartment.
- Do not mount muffler below oil drain valve.
- Secure mounting plate to support frame using 3/8-16 UNC grade 5 screws. Back two holes have weld nuts; front two can use screws, lockwashers, and nuts.
- Use screws long enough to allow minimum 1-1/2 threads to extend through nut.
Specs & values
- 0.6 inch (15 mm) minimum clearance between generator set and compartment walls/ceiling
- 3/8-16 UNC grade 5 screws
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.