Cummins/Onan CFP5E / CFP7E — Heat Exchanger Pressure Test
Testing & diagnosis
For the Cummins/Onan CFP5E / CFP7E, from the Cummins/Onan owner's manual.
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Procedure
- Install 1 inch NPT tubing adapter at raw water outlet.
- Install pressure test setup with 700 kPa (100 psi) gauge to 3/4 inch inlet.
- Apply air pressure at 414 kPa (60 psig).
- Isolate pressure source and monitor gauge for 5 minutes.
- There should be no change in pressure.
- Release pressure and remove test equipment.
- If leakage detected, replace heat exchanger.
Tools required
- pressure gauge Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Test pressure: 414 kPa (60 psig) for 5 minutes
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.