Attention! A compression tester for diesel engines must be used to check the compression pressure.
Checking the condition of the engine can be done by measuring the compression pressure in the cylinders. If this check is carried out regularly, it is possible to know in advance the beginning of engine wear, without waiting for the moment when wear manifests itself in low engine efficiency.
1. Using a compression gauge with adapter, check the compression pressure in the engine cylinders.
2. Before checking compression pressure, check that the battery is charged and in good condition. The air filter must be clean and the engine warmed up to normal operating temperature. Remove the glow plugs before checking. To prevent the engine from starting during the test, remove the fuel cut-off relay.
3. Install the compression gauge adapter into the glow plug hole.
4. Turn the engine over with the starter. After turning the crankshaft 1 or 2 revolutions, the compression pressure should increase to a maximum and then stabilize. Record your maximum score. Check other cylinders in the same way.
5. The compression pressure in all cylinders should not differ by more than two units. Note that the amount of compression should increase rapidly on a healthy engine. Low compression pressure on the first revolution of the crankshaft, followed by a gradual increase in pressure on subsequent revolutions, indicates worn piston rings. A low pressure value at the first revolution of the crankshaft, which increases slightly thereafter, indicates a leaky valve seat, a blown cylinder head gasket, or the presence of cracks in the cylinder head.
6. After performing the compression pressure test, install the fuel cut-off switch and install the glow plugs.