Valve Spring Inspection (3.0L); Camshaft Inspection (3.0L) - Mazda B-Series 1997 Workshop Manual

INSPECTION / REPAIR
6. Check the valve seat runout. Follow the instructions of the
gauge manufacturer. If the runout exceeds the wear limit,
resurface the valve and valve seat.
Runout limit:: 0.076mm (0.003 in)
7.
Measure the seat contact width.
Width: 1.5-2.0mm (0.06-0.08 in)
APPLY TORQUE UNTIL
AND MULTIPLY
READING BY TWO
\
VALVE SPRING
SET KNOB TO
COMPRESSED
LENGTH OF
SPRING
Valve Spring
1.
Inspect the valve spring, valve spring retainers and the
keepers for wear or damage. Discard any damaged parts.
2.
Check the springs for proper pressure at the specified
spring lengths. Weak valve springs cause poor engine
performance. Replace any spring nol: within specification.
Pressurellength
:
Loaded: 800.6 N (180 Ibs) at 29.5mm (1.16 in)
Unloaded: 288.1 N (65 Ibs) at 48.lmm (1.58 in)
3. Check the valve spring free length.
Free length:
46.7mm (1 -84 in} (approximate)
Assembled length:
44.1 741.98mrn { I .736-1.650 in)
CAMSHAFT
1. Check the camshaft journals for wear or scoring. If the
journals are excessively worn or !scored, replace the
camshaft.
2. Camshaft journals can be refinished to accommodate
0.38mm (0.01 5 in) undersize bearings. If the journals can
not be cleaned, replace the camshaft.
3. Set the camshaft on V-blocks and mleasure the camshaft
runout and out-of-round.
Runout: 0.05mm (0.002 in) maximum
Out-of-round: 0.025mm (0.001 in} maximum
B2-39