3. Inspection and Adjustment
3.5 Adjusting the Valve Clearance
Make adjustment while the engine is cold.
0
0
Remove the hood above the cylinder
head.
Turn the crankshaft to bring the piston
of the No.1 cylinder to its compression
top dead center while watching the
rocker arm motion, timing scale and
the top mark position of the crankshaft
pulley.
(Position where both the intake and ex-
haust valves are closed.)
(Notes)
l
The crankshaft shall be turned clockwise
as seen from the radiator side.
l
The No.1 cylinder position is on the oppo-
site side of the radiator and the ignition or-
der shall be 1-3-4-2-l at 180” intervals.
l
Since the intake and exhaust valve rocker
arms are operated the same and there is a
clearance between the arm and valve gen-
erally at the top dead center, the position
can be checked by means of the play when
the arm head is held with a hand. Also see
that the crankshaft pulley top mark is posi-
tioned at zero on the timing scale.
If there is no valve clearance, inspection in
the disassembled state is necessary since
the valve seat may be worn abnormally.
Insert a thickness gage between the
rocker arm and valve cap, and record
the measured valve clearance.
(Use it as the data for estimating the
wear state.)
Loosen the lock nut and adjusting
screw, and check the valve for any in-
clination, entrance of dirt or wear.
Insert a 0.2 or 0.3 mm thickness gage
between the rocker arm and valve cap,
and tighten the adjusting screw to ad-
just the valve clearance.
4TNE94.98 4TNE106(T)
Standard valve
clearance (mm)
0.15-0.25
0.25-0.35
Top mark
Rotatiohal direction
Valve clearance adjustment
Adjusting screw
Lock nut
Valve clearance
#----.I
.
FF
Valve cap
-7
R
Normal
Abnormal
m
3n
1 Lock nut tightening torque T=14.7-19.6 Nm (1.5-2.0 kaf*m\ 1
3-3
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