Suzuki WagonR+ RB310 Service Manual page 2521

6A1-46 ENGINE MECHANICAL
D Inspect valve stem end face for pitting and wear. If pitting or wear
is found there, valve stem end may be resurfaced, but not so
much as to grind off its chamfer. When it is worn so much that its
chamfer is gone, replace valve.
D Seating contact width:
Create contact pattern on each valve in the usual manner, i.e., by
giving uniform coat of marking compound to valve seat and by ro-
tatingly tapping seat with valve head. Valve lapper (tool used in
valve lapping) must be used.
Pattern produced on seating face of valve must be a continuous
ring without any break, and the width of pattern must be within
specified range.
Standard seating width revealed
by contact pattern on valve face Ex
D Valve seat repair:
A valve seat not producing a uniform contact with its valve or
showing width of seating contact that is out of specified range
must be repaired by regrinding or by cutting and regrinding and
finished by lapping.
1. EXHAUST VALVE SEAT: Use valve seat cutters (1) to make
two cuts as illustrated in figure. Two cutters must be used: the
first for making 15_ angle, and the second for making 45_
angle. The second cut must be made to produce desired seat
width.
Seat width for exhaust valve seat:
1.1 – 1.3 mm (0.0433 – 0.0512 in.)
In 1.1 – 1.3 mm
(0.0433 – 0.0512 in.)