Toyota Supra 1990 Manual page 42

EM-10 ENGINE MECHANICAL - Engine Tune-Up
EM0532
SST(A)
EM5872
(b) Determine the replacement shim size by using the fol-
lowing (Formula or Chart).
• Using a micrometer, measure the thickness of the
shim which was removed.
• Calculate the thickness of the new shim so the
valve clearance comes within specified value.
T ........ Thickness of shim used
A ........ Valve clearance measured
N ........ Thickness of shim new
Intake side: N
=
T
+
[A - 0.20 mm (0.0079 in.)]
Exhaust side: N
=
T
+
[A - 0.25 mm (0.0098 in.)]
• Select a new shim with a thickness as close as pos-
sible to the calculated value.
HINT: Shims are available in
17
sizes, in increments of
0.050
mm
(0.0020
in.), from
2.500
mm
(0.0984
in.) to
3.300
mm
(0.1299
in.).
(c)
Install the new adjusting shim.
• Place the new adjusting shim on the valve lifter.
• Using SST (A), press down the valve lifter and
remove SST (B).
SST
09248-55010
(d) Recheck the valve clearance.
7 . INSTALL CYLINDER HEAD COVERS
(See step 4 on pages EM-55, 56)
8. INSTALL AIR INTAKE CONNECTOR
(a) Install a new gasket and air intake connector with the
four bolts and two nuts.
Torque: 180 kg-em (13 ft-Ib, 18 N·m)
(b) Install the air intake connector bracket mounting bolts.