a. Press a compression gauge into the spark plug hole.
b. Fully depress the accelerator pedal.
c. Crank the engine and measure the compression pressure.Compression
Standard: 954 kPa {9.73 kgf/cm2, 138 psi} [300 rpm]
Minimum: 763 kPa {7.78 kgf/cm2, 111 psi} [300 rpm]
Maximum difference between cylinders: 161 kPa {1.64 kgf/cm2, 23.4 psi} [300 rpm]
NOTE:
Because the SKYACTIV-G 2.5 retards the intake valve closing timing, compression pressure is low.
d. Perform Steps (1) to (3) for all cylinders.
e. If the measured value is the threshold or less, or if there is a cylinder which exceeds the specified maximum difference between cylinders, add a small amount of engine oil through the spark plug hole and perform Steps (1) to (3).
If the pressure increases by adding the engine oil, the piston ring or the cylinder surface is worn, or they are damaged. Perform overhaul servicing.
If the pressure does not increase, valve seizure, valve attachment malfunction, or pressure leakage from the cylinder head gasket might be occurring. Perform overhaul servicing.
f. If the measured value is high, it is possible that there is an error in the electric variable valve timing system.