5-20 ENGINE TOP END
The following table should be consulted if the obtainable compression reading is not within the us-
higher than usable
lower than usable
Cylinder Head Removal
Drain the coolant (see Cooling System in the Periodic
Engine (see Engine Removal/Installation chapter)
Cylinder Head Cover (see Cylinder Head Cover Re-
Camshaft Chain Tensioner (see Camshaft Chain Ten-
Camshafts (see Camshaft Removal)
Camshaft Position Sensor [A] (see Electrical System
Remove the 6 mm cylinder head bolts [A], and then the 9
mm cylinder head bolts [B].
Take off the cylinder head.
Carbon accumulation on piston and in
combustion chamber possibly due to
damaged valve stem oil seal and/or
damaged piston oil rings (This may be
indicated by white exhaust smoke).
Incorrect cylinder head gasket thickness.
Gas leakage around cylinder head
Bad condition of valve seating
Incorrect valve clearance.
Incorrect piston/cylinder clearance
Bad condition of piston ring and/or piston
Remove the carbon deposits
and replace damaged parts if
Replace the gasket with a
Replace damaged gasket and
check cylinder head warp.
Repair if necessary.
Adjust the valve clearance.
Replace the piston and/or cylinder
Inspect the cylinder and
replace/repair the cylinder
and/or piston as necessary.
Replace the piston and/or the