- A diesel compression test is a test to measure how much pressure the engine is producing when it turns over1. The test procedure varies depending on the engine, but the overall procedure is similar for most engines2. The procedure includes the following steps:
- Disable fuel injection
- Remove all glow plugs to reduce compression resistance
- Use the correct adapter to thread into the glow plug hole
- Attach the test gauge to the adapter
- Verify that ignition is disabled to prevent engine from starting
- Using a test jumper or remote switch, activate the starter directly
- Crank the engine for 4-5 revolutions
- Read and record the final PSI on the gauge2.
Learn more:✕This summary was generated using AI based on multiple online sources. To view the original source information, use the "Learn more" links.When you bring your vehicle in for a compression test, a mechanic places a gauge into each of the cylinders to read how much pressure the engine is producing when the engine turns over. Generally, each cylinder should have 300 to 500 PSI, and all cylinders in a single engine should measure within 10 percent of each other.www.cenex.com/about/cenex-information/cenexper…Depending on which engine you have the test procedure will vary in details, but the overall procedure is similar for most engines:
- Disable fuel injection
- Remove all glow plugs to reduce compression resistance
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