2. Disconnect the connectors from all fuel injectors.
Note: Disconnecting the connectors from the fuel injectors will disable the fuel injection system.
3. Remove all glow plugs.
4. When turning the crankshaft with the starter, cover all the spark plug holes with a towel or cloth. After turning the crankshaft with the starter, check for impurities stuck to the towel.
Warning
(1) When checking compression, do not stand in front of the glow plug holes.
(2) If coolant, oil, fuel, etc. enters the cylinder during compression measurement (due to cracks), these substances will heat up and be ejected under pressure from the glow plug hole, which may be dangerous.
5. Connect the compression tester to the glow plug hole of one of the cylinders.
6. Use the starter to turn the engine crankshaft and measure the compression.
Minimum permissible compression at crankshaft speed of 250-400 min¹: 2000 kPa
(The article is based on data from the website: MITSUBISHIMAN)
7. Check the compression in the remaining cylinders and record the readings. The pressure in all cylinders should be the same or differ by no more than the permissible value.
Permissible difference in compression in engine cylinders: 400 kPa
8. If the pressure in any cylinder is too low, pour a teaspoon of clean motor oil into the cylinder through the glow plug hole and repeat steps 6 and 7.
(1) If the pressure increases after adding oil, this means that the piston rings and/or cylinder are worn.
(2) If the pressure does not increase, the cause is worn or burnt valves or a blown head gasket. Low pressure in two adjacent cylinders almost always means that the head gasket between them is blown.
10. Screw in the glow plugs.
11. Connect the connectors to the fuel injectors.