Cummins/Onan — Adjust the Vernatherm power element
Adjustments · Air shutter
From a Cummins/Onan service manual covering: 205D3A, 3DJA, 3DJA-1E2236, 3DJA-3E2236. Check it applies to your exact model before use.
Applies to: Cummins/Onan DJA engine
Procedure
- Loosen the power element mounting screws.
- Slide the assembly until it touches the roll pin with shutter closed.
- Tighten the mounting screws.
Specs & values
- Shutter begins to open at 120°F
- Fully open by 140°F
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.