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TAMD63P and TAMD72P also have a wastegate
valve (by-pass valve) installed in the turbine housing.
The wastegate valve means that the turbocharger is
optimized for high charging pressure even at low en-
gine speeds. The engine’s low-speed torque is there-
by improved greatly, while it also reacts more quickly
to load changes.
At higher engine loads, the wastegate valve opens
and forces some of the exhaust gases past the turbo
and directly out into the exhaust pipe.
The turbocharger is freshwater cooled to reduce the
radiant heat to the engine room.
TAMD63P, TAMD72P: Basic diagram of turbo-
charger with wastegate valve
1. Air from air filter 6. Exhaust gas flow past turbine
2. Compressed air to engine wheel via wastegate valve at
3. Compressor housing high engine loads
4. Turbine housing 7. Exhaust gases from engine
5. Exhaust gas outlet
Maintenance – Engine
Replacing crankcase ventilation filter
1. Remove the old filter by unscrewing it counter-
clockwise.
2. Check the rubber gasket in the mounting, replace
if necessary. Screw on the new filter by hand.
3. Check the drain hose is not clogged.
Checking/tensioning drive belt(s)
Check the belt(s) for wear. Belts which work in pairs
should be replaced at the same time.
Undo screws (A) before tensioning the belt(s).
TAMD63: Place the stud of a torque wrench in the
square hole in the tensioning pulley bracket. Tension
belt to 60 ±3 Nm (6 ±0.3 kpm/44 ±2 ft.lb.).
Tighten screws (A).
TAMD63: Tensioning drive belt
A. Locking screws
Charge air cooler (CAC)
The inlet air passes through the charge air cooler(s)
after compression in the turbocharger. The charge
air cooler lowers the temperature of the air and
thereby considerably improves the output ratio as the
volume of the air is reduced. More air (oxygen) can
therefore be forced into the engine’s cylinders and
burn more fuel per compression stroke; thus increas-
ing output. Charge air cooling also helps reduce the
thermal load on the engine.
See also under the heading “Heat exchanger and
charge air cooler” on page 54.
Filter for crankcase ventilation
1. Filter 2. Relief valve
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