Cummins/Onan QST30 — Coolant Filter Replacement
Maintenance
For the Cummins/Onan QST30, from the Cummins/Onan owner's manual.
Applies to: Cummins/Onan G-Drive, Cummins/Onan QST30, Cummins/Onan QST30 engine
Before you start
- Do not remove the radiator cap from a hot engine.
- Do not allow oil to get in the filter; it will adversely affect the DCA.
Procedure
- Remove the water filters.
- Clean the area around the filter head and the gasket surface.
- Close the valve on the filter head to prevent water loss.
- Lubricate the seal on the new filter with clean engine oil.
- Install the new coolant filter until the seal touches the head.
- Turn the filter an additional 1/2 to 3/4 of a turn after contact.
- Open the valve on the filter head.
Specs & values
- Turn filter 1/2 to 3/4 turn after seal contact
Full service-parts list: Cummins/Onan QST30 →
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.