Internal EGR
TAD1350GE, TAD1351GE, TAD1352GE,
TAD1353GE, TAD1354GE, TAD1355GE
General
P0006027
1
Camshaft
4
Exhaust rocker arm
5
Pump piston
6
Power piston
7
Check valve
8
Piston
9
Spring
10
Rocker arm, EGR
11
Exhaust lobe
The camshaft (
1
) on EGR engines has four cams per
cylinder; an inlet cam, injector cam, exhaust cam and
EGR cam.
Inside the exhaust cam (
4
) there are two pistons, a
pump piston(
5
) and a power piston (
6
), a check valve
(
7
), a piston (
8
) and a spring (
9
).
The power piston is located immediately above the
exhaust valve yoke and it is this piston that presses
the yoke down and opens the exhaust valve. The
pump piston is located immediately under the EGR
rocker arm (
10
) and it is the pump piston the EGR
rocker arm is able to press down.
The exhaust rocker arm (
4
) is designed so that the
EGR rocker arm (
10
) lies above the exhaust rocker
arm and when lubrication oil pressure is sufficiently
high the clearance between the two rocker arms is
reduced and the brake rocker arm is able to press the
pump piston down. The two pistons are connected via
an oil channel and when the pump piston is depressed
the oil under the piston is forced along to the power
piston. At the same time, the check valve closes and
the high pressure causes the power piston to press
down and open the exhaust valves.
20-0 Engine Information, General
72
7748841 06-2010
Содержание TAD1343GE
Страница 2: ......
Страница 4: ......
Страница 121: ...P0010531 P0010586 P0010587 21 0 Engine Complete General 7748841 06 2010 117 ...
Страница 304: ......
Страница 307: ...References to Service Bulletins Group No Date Refers to 303 ...
Страница 308: ......
Страница 310: ...7748841 English 06 2010 ...