Cummins/Onan 5.6TGHAA11381C — Cylinder Compression Test
Testing & diagnosis · Engine cylinders
For the Cummins/Onan 5.6TGHAA11381C, from the Cummins/Onan service manual.
Applies to: Cummins/Onan TGHAA
Procedure
- Start the genset and let it warm up.
- Stop the genset and remove and inspect the spark plugs.
- Insert the compression gauge nozzle into one of the spark plug holes, hold the throttle open and crank the engine.
- Note the pressure indicated by the gauge.
- Repeat the test on the other cylinder.
- If pressures do not meet Specifications, refer to Engine Block Assembly.
Tools required
- Cylinder compression tester Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Minimum cylinder compression test pressure 75 psi (517 kPa)
Full service-parts list: Cummins/Onan TGHAA →
Source: Cummins/Onan service 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.