2-26 PERIODIC MAINTENANCE
VALVE CLEARANCE ADJUSTMENT
The clearance is adjusted by replacing the existing tappet shim
with a thicker or thinner one.
• Remove the intake or exhaust camshafts. (
6-4 to -6)
• Remove the tappet
1
and shim
2
by fingers or magnetic
hand.
• Check the figures printed on the shim. These figures indicate
the thickness of the shim, as illustrated.
• Select a replacement shim that will provide a clearance within
the specified range. For the purpose of this adjustment, tap-
pet shim are available ranging from 1.200 to 2.200 mm in
steps of 0.025 mm. Fit the selected shim to the valve stem
end, with numbers toward tappet. Be sure to check shim size
with micrometer to ensure its size. Refer to the tappet shim
selection table (
2-27, -28) for details.
NOTE:
* Be sure to apply engine oil to tappet shim top and bottom
faces.
* When seating the tappet shim, be sure the figure printed sur-
face faces the tappet.
• Reinstall the camshafts in the specified manner.
(
6-30, -31)
• After replacing the tappet shim and camshafts, rotate the
engine so that the tappet is depressed fully. This will squeeze
out oil trapped between the shim and the tappet that could
cause an incorrect measurement. Then check the clearance
again to confirm that it is within the specified range.
After finishing the valve clearance adjustment, reinstall the fol-
lowing items.
• Cylinder head cover (
6-34)
• Spark plug and ignition coil/plug cap (
2-8)
• Radiator covers and fuel tank
• TDC plug and crankshaft hole plug (
6-33)
• Pour engine oil (
2-13)
• Seat
1.75 mm
175
