Chapter 2 Basic Engine
_2._C...;y;;;..l_in_d_e_r_H_ea_d
__________________________
3.4JH3(B)(C)E
(2) Valve spring
Check the valve arm spring and replace it it
i1
is corrod-
ed
or worn.
(3) Valve arm
and
valve top retainer
wear
Inspect
the
contact
surface
of
the
valve
arm
and
replace it it there is abnormal wear of flaking.
(4)
Inspect
the
contact
surface
of the
valve
clearance
adjustment screw and push rod and replace if there is
abnormal
wear
or
flaking.
2-8 Adjustment of valve head clearance
(1)
Make
adjustments when the engine is cool.
Intake and exhaust valve head clearance
0.2
mm
(2) Be sure that the opening and closing angles for both
the intake and the exhaust valves are checked when
the timing gear is disassembled (The gauge
on
the fly-
wheel is read when the push rod turns the flywheel).
T.D.C
Exhaust
254
•
8.O.C.
(3JH3E,3JH3BE,3JH3CE)
Clearance
Exhaust
254
•
( 4JH3E,4JH3E)
Intake valve Open
Intake valve Closed
Exhaust
valve
Open
Exhaust
valve
Closed
2-10
T.D.C.
B.D.C.
3JH3E
3JH3BE
3JH3CE
b.TDC.
6°~20·
a.BOC.
40•~50•
b.BDC.
51
'~60°
a.TDC.
13'~23°
Adjusting
screw
Lock nut
Intake 288.
4JH3E
4JH3BE
4JH3CE
10·~20·
4s·~5a·
51
'~61'
13"~23"
Printed in Japan
HINSHI-H8009
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