Cummins/Onan QSX15 / QSx15 — Supplemental Coolant Additive (SCA) Maintenance Check
Maintenance · cooling system
For the Cummins/Onan QSX15 / QSx15, from the Cummins/Onan operator's manual.
Applies to: Cummins/Onan QSx15, Cummins/Onan QSX15 engine
Before you start
- Insufficient concentration of coolant additives can result in liner pitting and engine failure.
- Coolant is toxic. Dispose of in accordance with local environmental regulations.
Procedure
- Check SCA concentration level at least every 6 months.
- Use Fleetguard Nelson coolant test kit CC2602. Follow instructions included with kit.
- If concentration is below 1.2 units per gallon, replace filter and precharge with liquid.
Tools required
- CC2602 Coolant Test Kit Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Test coolant sample between 10 and 54°C [50 and 130°F].
Full service-parts list: Cummins/Onan QSx15 →
Source: Cummins/Onan operator'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.