Cummins/Onan CFP11E — Heat Exchanger Pressure Test
Testing & diagnosis · Coolant heat exchanger
For the Cummins/Onan CFP11E, from the Cummins/Onan operator's manual.
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Procedure
- Install an adapter at the cooling water outlet of the heat exchanger.
- Install a pressure test setup with a 689 kPa (100 psi) gauge at the cooling water inlet.
- Apply air pressure at 414 kPa (60 psi).
- Isolate the pressure source and monitor the gauge for five minutes; there should be no pressure change.
- After testing, release pressure and remove the test equipment.
- If leakage is detected, replace the heat exchanger.
Tools required
- 689 kPa (100 psi) pressure gauge test setup Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- 414 kPa (60 psi) test pressure, 5 minute hold
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.