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Adjustments and Benchtesting
58
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Speed setting
IMPORTANT! When working with speed set-
tings, stand by to stop the engine manually to
avoid engine overspeed.
IMPORTANT! Set screw no. 4 adjusts maximum
fuel to engine and is factory set and should not
be touched.
NOTE! The idling speed and maximum speed are set
at factory bench testing, and the set bolts are sealed.
These settings are to be inspected and adjusted at
Volvo Penta Workshops only.
NOTE! After adjusting the governor be sure to seal
the stopper. Whether the seals are intact or not has
bearing on the validity of claims under the warranty.
NOTE! Prior to inspection and adjustment, run the
engine until coolant and oil temperature is 70°C
[158°F] or higher.
PSG Governor
Check and adjust idling speed setting
1. Make sure the speed control lever is in idling po-
sition, measure engine rpm.
2. If idling speed is out of the specified range, reset
with the adjust screw (1).
Check and adjust no-load max. speed setting
1. Move speed control lever to max. speed, mea-
sure engine rpm.
2. If max. speed is out of the specified range, reset
with the governor set bolt (2).
3. Manually change the engine speed to test the
governor response, its ability to sense changes in
speed and adjust it promptly to nominal speed.
Correcting hunting
1. If the engine hunts, adjust with the needle valve
(3). Open the needle valve (counterclockwise, 2
to 3 rotations) until the engine hunts. Keep it
hunting for 30 seconds, until air is vented from
the governor.
2. Slowly close the valve until the hunting stops.
NOTE! If the needle is closed too far, speed regula-
tion with respect to changes in load will be delayed.
Keep the valve backed off at least 1/4 rotation from
the fully closed position.
3. Seal all set bolts.
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