Camshaft and valve mechanism
T
D
C
5
P0006011
The engine has an overhead camshaft and a four-
valve system. The camshaft is induction hardened
and supported by seven bearing brackets, where the
rear bearing also acts as a thrust bearing. Both the
bearing cups and bearing brackets are replaceable.
There are cams between each shaft journal: an inlet
cam, injection cam, exhaust cam and EGR
(TAD1350–53GE). The camshaft is driven by a gear-
wheel (
1
) from the engine timing. A hydraulic vibration
damper (
2
) is installed on the outside of the gear-
wheel.
There are also teeth on the vibration damper for the
camshaft sensor.
NOTICE!
The vibration damper must absolutely not
be confused with vibration dampers for other variants.
Figure (
A
) shows a section through the valve mech-
anism for one pair of exhaust valves.
Each rocker arm acts on a so-called floating valve
yoke (
3
) that opens the valves. The rocker arm (
4
) is
supported by a bushing (
6
) on the rocker shaft (
5
).
Contact with the camshaft takes place via a roller (
7
)
and against the valve yoke by a ball seat (
8
).
The camshaft marking for static timing (TDC – Top
Dead Center) and for valve and injector adjustments
is located on the camshaft front end (
9
) in front of the
front bearing bracket (
10
).
20-0 Engine Information, General
7748841 06-2010
71
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