52
The fuel system has two fine fuel filters connected in
parallel have the same cover. These filters are
disposable, and the filter insert is made of a spirally
wound paper filter.
A single or double (connected in parallel) water-
separating pre-filter is also available as an accesso-
ry. The inserts of the double pre-filter can be re-
placed while the engine is running if necessary.
It is important that the fuel filters are replaced ac-
cording to the maintenance schedule. Blocked filters
make the engine difficult to start and contribute to
loss in engine output.
Fine fuel filters
Extra pre-filter
(single)
Pressure-dependent full load stop (smoke limiter)*
TAMD63, TAMD71, TAMD73WJ
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 amounts of
fuel injected by the injection pump. The smoke limiter
is connected to the inlet manifold via a plastic tube.
* Note. TAMD73P and TAMD74P engines are not equipped
with a smoke limiter. 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 TAMD73WJ 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
reduce.
On TAMD73P and TAMD74 engines the mechanical
centrifugal governor is replaced by an electromag-
netic 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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Summary of Contents for TAMD63L
Page 1: ...INSTRUCTION BOOK TAMD63L P TAMD71B TAMD73P WJ TAMD74C L P ...
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Page 120: ...118 Notes 7740156 Downloaded from www volvopenta com 22 07 2009 00 44 08 ...
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Page 124: ...7740156 0 English 6 2000 AB Volvo Penta SE 405 08 Göteborg Sweden www volvopenta com ...