Valves — Checking for leaks (Mitsubishi Colt 4)

The tightness of the valves is checked using kerosene, which must be poured into the combustion chambers. In this case, leakage of kerosene through the seals (valve - valve seat) is not allowed.

For stationary testing of valve tightness, a device is required.



To check for leaks, do the following:

Clean the seats and valves thoroughly and place the cylinder head on a stand.

Insert the valves into the corresponding guide bushings and close the spark plug holes with plugs.

Place the device (2) in the position shown in the figure.

Press the lever (1) hard and supply air with a rubber bulb until the pressure gauge shows a pressure of 50 kPa. No pressure drop should be observed within 10 seconds. If the pressure drops, i.e. air leaks, then it is necessary to grind the working chamfers of the valves and the seats on the cylinder head.

The valves are removed from the cylinder head using a tool.