Cummins/Onan — Test the air shutter power element
Testing & diagnosis
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
Before you start
- Do not overheat.
Procedure
- Remove the power element from the assembly.
- Heat the unit.
- Plunger should start moving at about 120°F.
- Total movement should be at least 1/5 in.
- Do not overheat.
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.