Toyota Land Cruiser 1988 Repair Manual page 50

ENGINE MECHANICAL- Cylinder Head EM-19
(b) Using a micrometer, measure the diameter of the
valve stem.
Valve stem diameter:
Intake
7.970- 7.985
mm
(0.3138- 0.3144 in.)
Exhaust 7.960-7.975 mm
(0.3134- 0.3140 in.)
(c) Subtract the valve stem diameter measurement from
the valve guide bushing inside diameter measure-
ment.
Standard oil clearance:
Intake
0.025 - 0.060
mm
(0.0010- 0.0024 in.)
Exhaust 0.035 - 0.070 mm
(0.0014- 0.0028
in.)
Maximum oil clearance:
Intake
0.10
mm
(0.0039
in.)
Exhaust
0.12
mm
{0.0047
in.)
If the clearance is greater than maximum, replace the
valve and guide bushing.
10. IF
NECESSARY, REPLACE VALVE GUIDE
BUSHINGS
(a) Using SST and a hammer, drive out the valve guide
bushing.
SST
09201-60011
(b) Using a caliper gauge, measure the bushing bore
diameter of the cylinder head.
Standard valve guide bore (cold):
14.000-14.018 mm (0.5512- 0.5519 in.)
If the bushing bore diameter of the cylinder head is more
than 14.018 mm (0.5512 in.), machine the bore to the
following dimensions and install an oversized bushing
(0/S
0.05).
Rebored cylinder head bushing bore dimensions:
14.050-14.068
mm
(0.5531 -0.5539
in.}
If the bushing bore diameter of the cylinder head is
greater than 14.068 mm (0.5539 in.), replace the cylin-
der head.
(c) Using SST and a hammer, drive in a new valve guide
bushing to where is 17.3-17.7 mm (0.681 -0.697
in.) protruding from the cylinder head.
SST 09201 -60011