D
P0006002
D
The injectors are centrally located between the four
valves and are held in place by yokes (
A
). For maxi-
mum cooling the coolant chamber in the cylinder head
is equipped with a horizontal baffle that forces coolant
past the lower, hottest parts of the cylinder head.
The valve mechanism is equipped with twin inlet and
exhaust valves. The exhaust valves have single valve
springs (
B
), as do the inlet valves (
C
). The valves are
linked in pairs by so-called floating valve yokes that
transfer rocker arm movement from
the camshaft to the valve pair. The valves have three
grooves and matching collets (
D
). The design of the
collets allows the valves to rotate on their seats. For
improved heat resistance and heat conduction, more
material is used in the exhaust valve discs and the
diameter is somewhat smaller than that of the inlet
valves.
The valve guides are made of alloyed cast iron and all
valve guides have double-lipped oil seals. The valve
seats are made from hardened special steel; they are
replaceable but cannot be machined.
20-0 Engine Information, General
7748841 06-2010
63
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