Checking the compression in the cylinders (Escort 4)

The compression value shows, in most cases, how worn out the cylinder-piston group of the engine is. To measure compression, a compression meter with a maximum reading of at least 15 bar is required.

1. Fully charge the battery. Adjust the valve clearances. Warm up the engine to operating temperature.

2. Unscrew the spark plugs and screw the compression gauge adapter into the hole of one of the spark plugs. Turn the crankshaft with the starter several times. Record the maximum compression pressure value.

3. Repeat measurements on the remaining three cylinders.

4. A decrease in compression in all cylinders most often indicates wear of the cylinders, rings and pistons.

5. Low compression in one of the cylinders means damage to the valve plates and seats, burnout or cracks in the piston, damage to the cylinder head gasket or cracks in the cylinder head.

6. Low compression in two adjacent cylinders most often means damage to the cylinder head gasket between the cylinders.

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