Valve Seat Removal (3.0L) - Mazda B-Series 1997 Workshop Manual

INSPECTION / REPAIR
3. Measure each valve guide inner bore diameter and record.
Inner diameter: 8.745--8.72mm (0.3443-4.3433 in)
Valve seat angle: 45"
I I
If necessary, resurface the valve seat.
Apply a thin coat of Prussian blue to the valve face.
Check the valve seating by pressing the valve against the
MBlOl9-A
VALVE STEM
CLEARANCE TOOL
TOOL-6505-E
MB1020-C 5BUOB2-037
seat.
(1) If blue does not appear 360" around the valve face,
4. Calculate the valve stem-to-guide clearance. With the
valves in place, measure the clearance with Valve Stem
Clearance Tool TOOL-6505-E, or equivalent and a dial
indicator. Use a flat-end indicator point.
(1) Install the tool on the valve stem until it is fully seated,
and tighten the knurled setscrew firmly. Permit the
valve to drop away from its seat until the tool contacts
the upper surface of the valve guide.
(2) Position the dial indicator with its flat tip against the
center portion of the tool's spherical section at approxi-
mately 90" to the valve stem axis.
(3) Move the tool back and forth in line with the indicator
stem. Take a reading on the dial indicator without
removing the tool from the valve guide upper surface.
(4) Divide the reading by two, the division factor for the
tool. If the valve stem-to-guide clearance exceeds the
wear limit, ream the valve guide for the next oversize
valve stem.
Clearance
IN: 0.026--0.068mm (0.001 0-4.0027 in)
EX: 0.038-0.081 mm (0.001 5 4 . 0 0 3 2 in)
Valve Seat
replace the valve face.
(2) If blue does not appear 360" around the valve seat,
resurface the seat.
I . Inspect the contact surface of the valve seat and valve
face for the following:
(1) Roughness
(2) Damage
2. Measure the valve seat angle.