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DISASSEMBLY, REASSEMBLY, INSPECTION, AND MAINTENANCE 3-27
Cylinder Head
Cleaning and Inspection
•
Inspect the cylinder head for the presence of any cracks or missing
fins. Replace the cylinder head if any of those conditions exist.
•
Clean the carbon deposits off the combustion chamber and the
exhaust port, and wash the cylinder head in a cleaning solvent.
•
Place a straightedge against the combustion chamber side of the
cylinder head and use a gap gauge to inspect for warpage.
If the warpage exceeds the service limit, replace the cylinder head.
Cylinder Head Warpage (maximum)
Service Limit: 0.05 mm (0.002 in)
•
Inspect the breather valve. (Refer to the breather section in
Lubrication System.)
A: Straightedge
B: Gap Gauge
Reassembly
CAUTION
Make sure that the piston is in the top-dead-center of the
compression stroke.
•
Clean the mating surfaces of the cylinder and the cylinder head, and
replace the gasket with a new one.
•
Place the pushrods in their original positions in the cylinder block and
install the cylinder head.
At this time, make sure that each end of a pushrod is properly fitted
in the recessed area of the tappet and the rocker arm.
•
Tighten the cylinder head retaining bolts little by little, evenly in
accordance with the tightening sequence given in the diagram on the
right, to their specified torque. (Refer to the section on Tightening
Torque Specifications.)