Valve Seat Inspection; Valve Spring Inspection - Mazda B-Series 1997 Workshop Manual

B1
INSPECTION I REPAIR
I
4BUOB1-09
APPLY TORQUE UNTIL
AND MULTIPLY
READING BY TWO
VALVE SPRING
SET KNOB TO
COMPRESSED
LENGTH OF
SPRING
5. Measure the hydraulic lash adjuster bore diameter.
Diameter: 21.4-24.0mm (0.8430-0.9449 in}
6. If the hydraulic lash adjuster bore diameter exceeds the
maximum, replace the cylinder head.
Valve Seat
1. lnspect the contact surface of the valve seat and valve
face for the following:
(1) Roughness
(2) Damage
2. If necessary, resurface the valve seat.
3. Apply a thin coat of Prussian blue to the valve face.
4. Check the valve seating by pressing the valve against the
seat.
(1) If blue does not appear 360" around the valve face,
replace the valve.
(2) If blue does not appear 360" around the valve seat,
resurface the seat.
5. Check the valve seat runout with a valve seat runout
gauge, as illustrated. Follow the instructions of the
gauge manufacturer. If the runout exceeds the wear
limit, resurface the valve and valve seat.
Runout Limit: 0.05mm (0.002 in}
Valve Spring
1. lnspect the valve spring, valve spring retainers and keys,
for wear or damage. Discard any damaged parts.
2. Check the springs (separated from dampers) for proper
pressure at the specified spring lengths. Follow the in-
structions of the spring tester manufacturer. Replace any
spring not within specification.
Pressurellength:
57-63 Ibs. at 39.6mm (1.56 in)
3. Check the valve spring free length.
Free length: 51.3mm (2.02 in) (approximate)