Compression Check: Testing and Inspection
INSPECT COMPRESSIONa) Warm up and stop engine.
b) Remove ignition coil.
c) Remove spark plugs.
d) Inspect cylinder compression pressure.
SST 09992-00500
1) Insert a compression gauge into the spark plug hole.
2) Fully open the throttle.
3) While cranking the engine, measure the compression pressure.
Compression pressure 1,300 kPa (13.3 kgf/cm2, 189 psi)
Minimum pressure: 1,000 kPa (10.2 kgf/cm2, 145 psi)
Difference between each cylinder: 100 kPa (1.0 kgf/cm2, 15 psi)
NOTICE:
^ Always use a fully charged battery to obtain engine speed of 250 rpm or more.
^ Check other cylinder's compression pressure in the same way.
^ This measurement must be done in as short a time as possible.
4) If the cylinder compression in one more cylinders is low, pour a small amount of engine oil into the cylinder through the spark plug hole and repeat steps (1) through (3) for cylinders with low compression.
HINT:
^ If adding oil helps the compression, it is likely that the piston rings and/or cylinder bore are worn or damaged.
^ If pressure stays low, a valve may be sticking or seating is improper, or there may be leakage from the gasket.