Cummins/Onan — Servicing Coolant Corrosion Resistor (Water Filter)
Maintenance · Cooling system filter
From a Cummins/Onan owner's manual covering: 25.0 DEH-515R, 25.0 DEH-53R, 30.0 DEH-15R, 30.0 DEH-3R, 30.0 DEH-9XR. Check it applies to your exact model before use.
Applies to: Cummins/Onan 25.0 DEH-515R, Cummins/Onan 25.0 DEH-53R, Cummins/Onan 30.0 DEH-15R, Cummins/Onan 30.0 DEH-3R, Cummins/Onan 30.0 DEH-9XR, Ford 2711E engine
Before you start
- If a stop-leak is added to coolant, isolate the filter using shutoff valves.
Procedure
- Clean filter body and surrounding area.
- Close coolant inlet and outlet shutoff valves.
- Remove drain plug and drain coolant.
- Remove cover capscrews and remove cover.
- Lift upper plate and filter element out; discard element.
- Remove lower corrosion resistor plate and spring; inspect and clean.
- Install sump plate, spring and lower plate; install new element.
- Install cover with gasket and capscrews; replace drain plug and open valves.
Specs & values
- Service at each 300 to 500 hour interval
Full service-parts list: Cummins/Onan 25.0 DEH-515R →, Cummins/Onan 25.0 DEH-53R →, Cummins/Onan 30.0 DEH-15R →, Cummins/Onan 30.0 DEH-3R →, Cummins/Onan 30.0 DEH-9XR →
Source: Cummins/Onan owner's 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.