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The fuel system has two fine fuel filters connected in
parallel have the same cover. These filters are dis-
posable, and the filter insert is made of a spirally
wound paper filter.
A single or double (connected in parallel) water-sep-
arating pre-filter is also available as an accessory.
The inserts of the double pre-filter can be replaced
while the engine is running if necessary.
It is important to replace the fuel filters according to
the maintenance schedule. Clogged filters make the
engine difficult to start and reduce engine perform-
ance.
Fine fuel filters
Extra pre-filter
(single)
Pressure-dependent full load stop (smoke limiter)*
TAMD63, TAMD71, TAMD72WJ
The injection pump has a pressure-dependent full
load stop (smoke limiter) which is located at the front
of the pump. Its job is to reduce sooty exhaust gases
during hard acceleration from low speeds when the
flow of exhaust gases through the turbocharger is too
small to provide the full amount of air to the fuel in-
jected by the injection pump. The smoke limiter is
connected to the inlet manifold via a plastic tube.
*Note! TAMD72P engines are not equipped with a smoke lim-
iter. The equivalent function is integrated in the Electronic
Diesel Control (EDC) system.
Feed pump
Feed pump
If the injection pump is to work, it requires a supply of
fuel at pressure. This is provided by the feed pump,
which is of piston type. The feed pump is located on
the injection pump and is driven by the injection
pump’s camshaft.
The feed pressure is determined by an overflow
valve located on the injection pump. This valve both
limits the feed pump pressure and ensures continu-
ous venting of the fuel system.
The feed pump’s hand pump can be used on a
stopped engine to pump fuel to the filters and injec-
tion pump when venting the fuel system, for example
after replacing the fuel filters.
Injection pump
The injection pump is of the piston type and located
on the left of the engine. It is driven by the timing
gears.
On TAMD63, TAMD71 and TAMD72WJ engines the
pump is equipped with a centrifugal governor. The
governor controls both fuel supply to the engine to
maintain the engine speed set at the throttle control
and also limits the engines maximum speed if the
load at high throttle openings suddenly should re-
duce.
On TAMD72P engines the mechanical centrifugal
governor is replaced by an electromagnetic actuator.
The actuator is controlled by a control module which
receives information from a number of sensors on
the engine and throttle control.
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