Checking the compression in the cylinders (VW Transporter T3)

The results of the compression test allow us to draw a conclusion about the condition of the engine. Namely, the test allows us to draw a conclusion about the wear of the valves or pistons (piston rings), in addition, based on the results of the test, it is possible to determine whether the engine can be repaired by replacing individual parts and whether a major overhaul is required. A compression gauge (pressure gauge) is required for testing.

As the engine mileage increases, the compression decreases. When the wear limit is reached, the engine must be replaced or overhauled. The difference in compression of individual cylinders depends on the engine power. The following values must not be exceeded: DF, DG, DJ, MV, GW, SS engines max. 3 bar, EY engine max. 2 bar. Exceeding these values is a sign of defective valves, wear of piston rings or cylinder running surfaces.



Caution: When checking compression, disconnect the ignition wire (terminal 4) from the distributor cap, extend it with a suitable wire and connect it to the vehicle ground. Observe safety precautions when working with the TSZ system.



To check the compression, warm up the engine. Unscrew the spark plugs, and connect the pressure gauge to the spark plug hole in accordance with the operating instructions.

The original text can be found on the portal (VWmanual.ru)

The assistant must press the gas pedal all the way down and keep his foot on the pedal throughout the entire test.

Let the starter run for about 5 seconds. Read the pressure gauge reading.

Check all cylinders in sequence and compare the results with the specified value.