45
TAMD63P, TAMD73P and TAMD74 also have a
wastegate valve (boost pressure control (by-pass)
valve) installed in the turbine housing.
The wastegate valve means that the turbocharger is
optimized for high charging pressure even at low
engine speeds. The engine’s low-speed torque is
thereby 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 reduced
radiant heat in the engine room.
TAMD63P, TAMD73P and TAMD74: Basic
diagram of turbocharger with wastegate valve
1.
Air from air filter
6.
Exhaust gas flow past turbine
2.
Compressed air to engine
via wastegate valve at high
3.
Compressor housing
engine loads
4.
Turbine housing
7.
Exhaust gases from engine
5.
Exhaust gases outlet
Maintenance – Engine
Replacing crankcase ventilation filter(s)
1. Remove the old filter by unscrewing it counter-
clockwise. Note! TAMD73 and TAMD74 have
two filters.
2. Check the rubber gasket in the mounting, replace
if necessary. Screw on the new filter by hand.
3. TAMD71: Check the drain hose is not clogged.
Checking/tensioning drive belt(s)
Check the belt(s) for wear. Replace belt(s) when
necessary. Belts which work in pairs should be
replaced at the same time.
Undo screws (A) before tensioning the belt(s).
TAMD63, TAMD73 and TAMD74: 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 lbf.ft.).
Tighten screws (A).
TAMD63, TAMD73, TAMD74: 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 58.
TAMD73, TAMD74: Crankcase ventilation filters
1.
Filter
2. Relief valve
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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 ...