Exhaust system
32
Measuring exhaust backpres-
sure
After the exhaust line has been installed, the back-
pressure must always be checked. This can be easily
done with the aid of a transparent plastic hose con-
nected to a measuring flange (see chapter
Special
tools) occasionally installed in the exhaust line.
The back-pressure can also be checked with the aid
of a suitable pressure gauge.
When testing is carried out, the engine should be run
under full loading a sufficiently long period to obtain a
stable value.
Backpressure
The exhaust system will produce a certain resistance
to the exhaust gas flow. This resistance or backpres-
sure must be kept within specified limits. Excessive
backpressure can cause damage and will lead to:
•
Loss of power output
•
Poor fuel economy
•
High exhaust temperature
These conditions produce overheating and excessive
smoke from the installation, and reduce the service
life of the valves and turbocharger.
No performance losses
(Relative to technical data. Maximum allowed backpressure for emission certified engines.)
Small performance losses
(Not approved backpressure for exhaust emission certified engines.)
Not acceptable
Max. allowed backpressure in exhaust pipe at rated rpm, kPa*
0 2 3 4 5 6 7 8 9 0 2 3 4 5 6 7 8 9 20 2 22 23 24 25
kPa*
*) kPa = 00 mm wc
D5/D7
D9/D/
D2/D6
Summary of Contents for D11 series
Page 1: ...Marine Propulsion Diesel Engines Installation 1 1 D E D5 D16 series ...
Page 2: ......
Page 208: ...206 References to Service Bulletins Group No Date Concerns ...
Page 209: ...207 Notes ...
Page 210: ...208 Notes ...
Page 212: ...7748655 English 11 2007 ...