Cummins/Onan — Heat exchanger pressure test
Testing & diagnosis
From a Cummins/Onan owner's manual covering: CFP15E, CFP23E, CFP30E, CFP50, CFP5E, CFP60E, CFP7E, CFP9E, CFP9E HHP. Check it applies to your exact model before use.
Applies to: Cummins/Onan CFP23E
Before you start
- Use Teflon tape or pipe sealant when installing test setup.
Procedure
- Install an adapter at the cooling water outlet of the heat exchanger.
- Install a pressure test setup with 689 kPa (100 psi) gauge at the cooling water inlet.
- Apply air pressure at 276 kPa (40 psi).
- Isolate pressure source and monitor gauge for five minutes.
- Release pressure and remove test equipment.
Tools required
- pressure gauge 689 kPa (100 psi) Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Apply air pressure at 276 kPa (40 psi); no pressure change for five minutes
Full service-parts list: Cummins/Onan CFP23E →
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.