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Manual 03101
Governor faults are usually revealed as speed variations of the prime mover,
however, it does not necessarily follow that all speed variations indicate governor
faults. Troubleshoot the governor to localize a problem before attempting
disassembly and repair.
Use the following Troubleshooting Diagram to troubleshoot your governor. See
Chapter 6, Governor Calibration, or refer to the engine manufacturer's
specifications for engine calibration.
Problem
Question
With manual
Engine cranks,
assistance, can
but governor
the governor
output shaft
output shaft be
doesn't move
easily moved
from minimum
towards
position.
maximum while
cranking?
Governor opens
fuel, but is slow
and sluggish.
Governor opens
fuel, but only part
way.
Governor opens
fuel and prime
mover starts, but
trips out on
overspeed.
System oscillates
and is unstable.
Woodward
This document, and more, is available for download from Martin's Marine Engineering Page - www.dieselduck.net
Chapter 4.
Troubleshooting
Be prepared to make an emergency shutdown when starting the
engine, turbine, or other type of prime mover, to protect against
runaway or overspeed with possible personal injury, loss of life, or
property damage.
Procedure
YES—
1.
Is governor filled with oil?
2.
Is the rotation of the pump set correctly?
3.
Have you cranked the engine for at least 10 seconds to allow the
governor time to develop pressure?
4.
Is the drive shaft connected?
5.
Is the oil viscosity greater than 50 SUS?
6.
Is the cranking speed too low?
NO—
1.
Are any shutdown devices activated or incorrectly adjusted?
2.
Is speed setting above cranking speed?
3.
Is linkage free from excessive friction?
4.
Is load limit set at zero?
5.
If fuel limiter is used, is it correctly adjusted?
1.
Are shutdowns properly adjusted?
2.
Is the governor oil viscosity less than 50 SUS, or above 3000
SUS?
3.
Is the need valve closed too far?
4.
Is linkage to the engine free?
1.
Is load limited adjusted properly, and set out of the way?
2.
Is there adequate manifold pressure? [applies to fuel limit type
governors]
3.
Is fuel stop on engine adjusted properly?
4.
Is fuel stop in governor set properly?
5.
Is fuel linkage free?
1.
Is the linkage sticky?
2.
Is the linkage properly adjusted?
3.
Is the overspeed trip set properly?
4.
Is the needle valve closed too far?
5.
Is the governor speed setting too high?
Check the following:
1.
Is droop properly set?
2.
Is the needle valve correctly adjusted?
3.
Is linkage sticky or worn?
3161 Governor
11
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