Operation
6420−1/A1
Winterthur Gas & Diesel Ltd.
1/ 3
Scavenge Air Receiver
1. General
The scavenge air receiver (4, Fig. 1) is a welded assembly attached to the cylinder
block on the exhaust side. The scavenge air receiver has the parts that follow:
D Receiver
D Turbocharger support
D Diffuser
D Scavenge air cooler casing
D Charging unit.
The longitudinal wall (7, Fig. 2) divides the receiver into the receiver space (5) and air
space (6). The flaps (8, 9) are attached to the longitudinal wall (7).
2. Function
During operation, the turbocharger blows scavenge air through the scavenge air
cooler (SAC) into the charging unit, through the water separator and then into the air
space (6, Fig. 2). The air then flows through the flaps (8, 9) into the receiver space (5)
and through openings in the cylinder block to the piston underside (10). The
scavenge air flows through the scavenge ports when the piston is near BDC. The
flaps (8, 9) prevent back-flow into the air space (6).
Two auxiliary blowers (3, Fig. 1) are attached to the scavenge air receiver. During
engine start or at low engine load, the auxiliary blowers come on and move scavenge
air from the space (6, Fig. 2) through the duct to the receiver space (5). The
flaps (8, 9) prevent the back-flow of air when the auxiliary blowers are set to off.
The relief valve (5, Fig. 1), installed on the scavenge air receiver, opens when the air
pressure increases to more than the permitted value in the receiver space.
WARNING
Injury Hazard: Do not go into the the receiver space (5, Fig. 2)
during engine operation. Access into the receiver space through
the covers (9, Fig. 1) is possible only when the engine has
stopped.
You can do an inspection of the running surface of the piston, cylinder liner, piston
rings and the piston rod gland from the receiver space (5, Fig. 2).
Note: If the turbocharger becomes defective, see 0590−1 Defective
Turbocharger).
2015-03
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