Valve Spring Inspection (4.0L); Camshaft Inspection (4.0L) - Mazda B-Series 1997 Workshop Manual

INSPECTION
/
REPAIR
6. Check the valve seat runout.
APPLY TORQUE UNTIL
TORQUE WRENCH
AND MULTIPLY
READING BY TWO
\
VALVE SPRING
SET KNOB TO
COMPREiSSED
LENGTH OF
SPRING
Runout
Limit:
0.0381 mm (0.001 5 in}
Valve Spring
1.
Inspect the valve spring, valve spring retainers and keys
for wear or damage. Discard any damaged parts.
2. Check the springs for proper pressure at the specified
spring lengths. Replace any !spring not within
specification.
Pressurellength:
132-1 49 kgf (60-68 Ibs.} at 40.3mm (1.585 in}
304-327 kgf (138-149 Ibs.) at 31.0mm (1.222 in)
I I
MBI 022-6
3. Check the valve spring free length.
Free length:
48.5mm (1.91 in} (approximate)
4.
Check the out-of-square of the valve spring.
Out-of-square:
1.98mm (0.078 in)
Caution
Make sure the springs are reassembled to their
original dampers.
MB1023-B 4BUOB3-113
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
0.38 mm (0.01 5 in} undersize bearings. If the journals can
not be cleaned, replace the camshaft.
3. Set the camshaft on V-blocks and rneasure the runout.
Replace the camshaft if necessary.
Runout: 0.127mm (0.005 in} max.
4. Measure the camshaft lobe height in Ihe two points (A and
B) as shown.
Subtract B from A
==
lobe height
Replace the camshaft if necessary.
Height
IN: 10.221mm (0.4024 in}
EX: 10.221 mm (0.4024 in}