Draper Expert Petrol and Diesel Master Engine Compression Test Kit - 35886

The pressure relief valve is a safety feature that releases pressure when the testing is complete, preventing damage to the gauge and allowing for safe disconnection.

Yes, this kit is designed for both petrol and diesel engines.

Make sure the adaptor is securely connected and that there are no leaks. Check for any obstructions in the hose or the gauge.

Compare the readings to the manufacturer's specifications. Low readings in one or more cylinders indicate a problem that needs further investigation. Significant differences between cylinders suggest mechanical issues.

The gauge should be calibrated annually or if you suspect it is providing inaccurate readings. Contact a professional to calibrate the gauge.

If the hose kinks, it may affect the accuracy of the reading. Replace the hose if it is damaged. The included anti-kink coils help prevent this.

Make sure you are using the correct adaptor for your vehicle. If the correct adaptor is not included, you may need to purchase an additional one.

Store the kit in the provided plastic storage case in a dry place to protect the components and keep them organized.

Ensure the adaptor is properly sealed in the spark plug or glow plug hole. Check the hose connections for leaks. Verify that the pressure relief valve is closed.

Make sure the engine is at operating temperature. Fully charge the battery to ensure proper cranking speed. Ensure the throttle is fully open during the test. Check for any leaks in the system.

Double-check the adaptor selection guide. If a suitable adaptor is not included, an alternative adaptor may be required.