ENGINE TOP END 3-19
Cylinder Head Compression Measurement
Start the engine and warm it up thoroughly.
Stop the engine and remove all the spark plugs.
Spark Plug Wrench: 57001-1024
Measure the compression of a cylinder.
OWith the throttle fully open, use the starter motor to turn
the engine over, and read the highest reading on the com-
Gauge, 20 kgf/cm2: 57001-221
Use a battery that is fully charged.
o Make sure that there are no compression leaks from the
cylinder head gasket.
1 177 kPa (7.7 - 12.0 kgf/cm2,
109 - 170 psi) @385 r/min (rpm)
Measure the compression of the remaining cylinders in
the same manner.
The following table should be consulted if the obtainable compression reading is not within the us-
on piston and in
Remove the carbon deposits
combustion chamber possibly due to
and replace damaged parts if
damaged valve stem oil seal and/or
damaged piston oil rings (This may be
indicated by white exhaust smoke).
higher than usable
Incorrect cylinder head gasket thickness.
Replace the gasket with a
Gas leakage around cylinder head
Replace damaged gasket and
check cylinder head warp.
Bad condition of valve seating
Repair if necessary.
Incorrect valve clearance.
Adjust the valve clearance.
Incorrect piston/cylinder clearance
Replace the piston and/or cylinder
lower than usable
Inspect the cylinder and
and/or piston as necessary.
Bad condition of piston ring and/or piston
Replace the piston and/or the