DIY Engine Compression Check: Essential Tips for Diagnosing Engine Health > 자유게시판

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Running a simple compression evaluation is a simple method to determine the integrity of your engine’s internal mechanics. This test helps you identify whether the pistons, rings, valves, or head gasket are functioning as intended. Low compression in one or more cylinders can signal internal degradation that might lead to diminished acceleration, vibration, or total engine seizure.

In the initial phase, make sure the engine is thermally stabilized. A moderately heated engine gives precise measurements because all parts are at optimal thermal expansion. Turn off the engine and remove the key and disconnect the fuel pump relay or fuse to stop fuel injection during testing. You should also disable the spark delivery to avoid accidental cranking.

Proceed by taking out each spark plug. Mark each plug with its cylinder number so you can put them back in the right spots. Use a spark plug socket and ratchet to safely unscrew them. Never allow objects to enter the cylinder bores.

Secure the testing device into cylinder one. Make sure it is securely fastened to get an accurate reading. Have a helper fully depress the accelerator pedal and run the motor for 5 to 7 full rotations. Monitor the dial as it climbs. Record the peak value. Perform the same test on all remaining cylinders, making sure to reset the gauge between tests.

Following completion of all tests, compare them. A healthy engine typically has compression in the range of 120–170 pounds per square inch. The readings should be fairly consistent across all cylinders. A gap wider than 15% between the maximum and minimum pressures may signal a fault. For example, if one chamber has substantially less compression, it could mean a worn piston ring, a leaking valve, or a blown head gasket.

If you find a low reading, you can do a moisture-assisted diagnostic to help determine the root cause. Pour roughly one teaspoon of motor oil into the problematic cylinder’s spark plug port. Then repeat the compression test. If the reading goes up significantly, the problem is likely worn piston rings. If the reading stays the same, the issue is probably with the valve seals or اتوسرویس داوود cylinder head seal.

Once testing is complete, replace all spark plugs, reconnect the ignition and fuel delivery circuits, and crank the motor to confirm proper function. A engine health diagnostic doesn’t require special tools beyond a gauge and a few basic hand tools, but it gives you deep understanding of internal engine status. Frequent compression evaluations reduce long-term repair expenses.