0B-7 Maintenance and Lubrication:
11) Turn the crankshaft clockwise 360° (one full rotation)
and align the match mark on the crankshaft with the
mating surfaces of crankcases. Also, position the
notches “E” on the right end of each camshaft as
shown. Then, measure the following valve
clearances “G”.
• Cylinder #2: Intake valve clearance
• Cylinder #3: Exhaust valve clearance
• Cylinder #4: Intake and exhaust valve clearances
12) Measure the valve clearances of the remaining
valves “E” and adjust them if necessary.
Adjustment
The clearance is adjusted by replacing the existing
tappet shim with a thicker or thinner shim.
1) Remove the intake or exhaust camshafts. Refer to
“Engine Top Side Disassembly in Section 1D
(Page 1D-24)”.
2) Remove the tappet (1) and shim (2) by fingers or
magnetic hand.
3) Check the figures printed on the shim. These figures
indicate the thickness of the shim, as illustrated.
4) Select a replacement shim that will provide a
clearance within the specified range. For the
purpose of this adjustment, a total of 21 sizes of
tappet shim are available ranging from 1.20 to 2.20
mm in steps of 0.05 mm.
CAUTION
!
Both the right and left valve clearances
should be as closely as possible.
5) Fit the selected shim (2) to the valve stem end, with
numbers toward tappet. Be sure to check shim size
with micrometer to ensure its size.
NOTE
• Be sure to apply engine oil to tappet shim
top and bottom faces.
• When seating the tappet shim, be sure the
figure printed surface faces the tappet.
Camshaft position
Notch “E” position
faces inside
Measuring position “G”
“E”
“E”
I718H1020018-02
“G”
“G”
“G”
“G”
I718H1020020-01
1
2
I718H1020019-01
I310G1020023-01
2
I718H1020002-02
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