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7741591 / 2003-12
Belt adjustments
CAUTION!
To prevent possible injury caused by someone inad-
vertently starting the engine, remove the ignition keys
from each starting location (especially if the engine
room/engine compartment cannot be seen from vari-
ous remote starting positions such as a flybridge or
enclosed cabin).
(3.0GS, 4.3GXi, 5.0GXi, 5.7Gi/GXi, 8.1Gi/GXi, DPX
375/420)
These engine models use a serpentine belt, which is a contin-
uous-loop belt threaded through the alternator pulley, circulat-
ing pump pulley, idler pulley, and power steering pump pulley.
This single belt replaces three separate belts (alternator, circu-
lation pump, and power steering belts). At least once per year,
have your Volvo Penta dealer check the serpentine belt for
wear. An ideal time to have this check performed is when you
have the gimbal bearings and universal joints lubricated.
(4.3GL, 5.0GL, 5.7GL)
CAUTION! The belts used for the alternator, wa-
ter supply pump, and power steering pump are heavy
duty. Do not replace with automotive belts.
Belt tension
1.
Belt tension is determined by belt deflection.
•
With the engine stopped, the belt should be tight
enough so that it will deflect ¼ inch (6 mm) when
pressed with a finger, or 75 ± 10 pounds (333.6 ±
44.5 N) when using a belt tension gauge.
•
If the belt is too tight, excessive belt and bearing wear
can occur.
•
If it is too loose, slippage can occur, resulting in belt
wear, poor circulating pump alternator, and power
steering operation.
2.
Belt tension should be checked after 10 hours of service
and every 5 hours thereafter.
Circulating
pump
pulley
(Midpoint)
(Midpoint)
Alternator
pulley
Power steering
pump pulley
Alternator belt
With engine
OFF, check alternator belt deflection midway be-
tween the circulating pump pulley and the alternator pulley.
To increase belt tension:
1.
Loosen alternator mounting screws and nuts.
2.
Pivot the alternator away from the engine to increase belt
tension.
3.
While maintaining pressure on the alternator, retighten the
top screw and bottom screw and nut.
4.
Recheck belt tension.
Idler belt
NOTE! Improper idler belt adjustment will result in
hard steering.
With engine
OFF, check idler belt deflection midway between
the circulating pump pulley and the idler pump pulley.
To increase belt tension:
1.
Loosen pump mounting bracket screws.
2.
With a long screwdriver, pry against a corner of the timing
chain cover and tab on pump mounting bracket. Never pry
against the pump reservoir or pull filler neck.
3.
While maintaining pressure on the bracket, tighten the screw
closest to the tab, then tighten the other screws.
4.
Recheck belt tension.
Maintenance
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Summary of Contents for 3.0GL-B
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