Mazda B-Series 1997 Workshop Manual page 170

INSPECTION 1 REPAIR
6. Measure the camshaft journal diameters in the X and Y
directions at two points. Replace the camshaft as neces-
sary.
B
A
Journal diameter:
50.987-51 -01 3mm (2.0074-2.0084 in)
4. Inspect the camshaft for wear or damage.
5. Measure the camshaft lobe lift. To measure the lift,
proceed as follows:
(1)
Measure the distance between major (A-A) and minor
(B-B) diameters of each cam lobe with a Vernier
caliper and record readings. The difference in read-
ings on each cam diameter is the lobe lift.
(2) If the readings are not within specification, replace the
camshaft.
Lobe lift: 6.604mm (0.260 in}
"
7 .
Measure the camshaft oil clearance by measuring the
journal diameter and the bore diameter. Subtract the
journal diameter from the bore diameter to determine the
31
282-A 4 ~ ~ 0 6 2 - 1 0 7
oil clearance.
~ ~ 1 0 2 4 - A
Minimum: 6.477mm (0.255 in)
Oil clearance:
0.025--0.076mm (0.001-0.003 in]
8. Measure the camshaft end play.
Caution
Prying against the camshaft pulley with the valve
train load on the camshaft can break or damage the
gear. Therefore, the rocker arm adjusting nuts must
be backed off, or the rocker and shaft assembly
must be loosened sufficiently to free the camshaft.
(1) Push the camshaft toward the rear of the engine.
Install a dial indicator so the indicator point is on the
camshaft pulley.
(2) Zero the dial indicator. Pull the camshaft forward and
release it. Compare the reading with specifications. If
end play is excessive, replace the thrust plate.
(3) Remove the dial indicator.
End play: 0.003mm (0.007 in)