Daihatsu F300 Service Manual page 1212

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Using a 70-degrees cutter, cut the valve seat in such
a way that the width of the surface refaced by the
45-degrees cutter may become 1.4 mm.
@ Using the 45-degrees cutter, remove burrs
produced during the refacing by the 20-degrees
and 70-degrees cutters .
13. Hand lapping of valves
( 1) Perform hand lappjng of the valves and valve seats,
using an abrasive compound.
(2) Clean the valves and valve seats after the hand lapping
of the valves.
14. Inspection of valve recession
After the valve seat has been refaced, install the new valve.
Measure the distance between the cylinder attach"1ng sur-
face of the cylinder head (attaching surface of the cylinder
head gasket) and the upper most section of the valve.
Ensure that the distance does not exceed the following
maximum limit.
Maximum Limit
Intake Valve: 2.775 mm
Exhaust Valve: 6.026 mm
If the recession exceeds the maximum limit, replace the
cylinder head.
15. Inspection of valve stem-to-guide bushing oil clearance
(1) Using a caliper gauge, measure the inner diameter of
the valve guide at six points.
Record the measured values.
Specified Value
IN: 6,600 - 6;620 mm
EX: 6,600 - 6,620 mm
EM-71
ENGINE MECHANICALS
EX