Chapter 2 Basic Engine
8. Camshaft and Tappets
14LHA Series\
8.
Camshaft
and
Tappets
8-1
Camshaft
The
camshaft is normalized and the cam and bearing
surfaces
are
surface hardened and
ground.
The
cams
have
a
curve
that
minimizes the repeated shock on the valve
seats
and
maximizes valve seat life.
Push
rod
Camshaft
gear
(1)
Checking
the camshaft side gap
The
standard bearing near the end of the camshaft by
the cam gear receives the
load,
resulting in rapid wear
of the end of the bearing and enlargement of the side
gap.
Therefore, measure the
thrust
gap before
disas-
sembly.
As the cam gear is shrink-fitted to the
cam,
be
careful when replacing the
thrust
bearing.
Camshaft
gear
Thrust metal
Thrust metal'
(2) Measure the cam height, and replace the cam if it
is
worn beyond the
limit.
mm (in.)
Side
gap
Cam
height
Standard
Wear
limit
Intake
cam
48.435
- 48.565
(1.9069-1.9120)
48.1
(1.9094)
Exhaust
cam
48.435
- 48.565
(1.9069-1.9120)
48.1
(1.9094)
mm (in.)
Standard
Wear
limit
Camshaft
side gap
0.05 - 0.20
(0.0020 - 0.0079)
0.29
(0.0114)
2-32
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