Volvo D11 series, Installation Manual

Page: 119 / 212

Exhaust system
7
Exhaust elbow angle ( α ) relative to water line,
fig. A should be min:
D5
5°
D7 0°
D9/D elbow angle is fixed
D2 5°
The elbow angle is important to obtain a water spray
all around the outlet. This is to avoid overheating of
the top of the exhaust hose.
It is very important to install a flexible hose to the
exhaust elbow. This hose must be flexible enough to
allow the engine to move without creating stress on
elbow or its connection.
The hose must be arranged with a continuos inclina-
tion into the silencer throughout the whole distance,
see figure A.
If the hose between elbow and silencer has such a
length or design it must be supported () to avoid a
"sack", see figure A.
Inclination angle ( β ) figure B
from elbow to silencer should be min:
Longitudinal inclination 4° (according to figure B)
Longitudinal inclination,
systems without silencer 0°
Transverse inclination 0° (according to figure C)
Fig. B
β
Transverse inclination (
β
) figure C:
The inclination should be minimum 0°.
This presumes that the coolant can be collected in
the silencer inlet. See figure C position ().
Exhaust systems without silencers should have an
average inclination of min. 0°.
Inclination angle (
γ
) figure C, longitudinal exhaust
line from silencer to exhaust outlet:
The minimum permissible fore and aft inclination (
γ
)
between the silencer and the exhaust outlet in the
hull is 50–70 mm/m (2–2 3/4"/3.3'), 3°–4°. See figure
C.
For sailing yachts see principal system figure D on
the following page.
Fig. C
β =0°
γ
= 3°–4°
α
Fig. A