3. Check the belt tension. Excessive belt tension
will damage the bearings in the water pump and al-
ternator Insufficient tension will cause slipping
Replace worn belts
Belt Tension is determined by belt deflection With
engine stopped, the belt should be t=ght enough so
that it will deflect 1/4 to 1/2 in (6-13 mm) when
pressed with the finger at the points G and I shown
If the belt is too tight, excessive belt and bearing
wear can occur. If the belt is too loose, slippage can
occur, resulting ~n belt wear and poor operation of
lhe water circulating pump and alternator
,Alternator Belt. With engine off, check alternator
belt deflection midway G between the circulating
pump pulley and the alternator pulley
Loosen alternator mounting screws and nuts, and
pivot alternator away from engine to ~ncrease bolt
lenslon While mamtalnlng pressure on a{ternator,
ret~ghten top screw and bottom screw and nut Re-
check belt tension
Water Pump Belt. With engine off, check water
pump belt deflection midway I between the water
pump pulley and the clrculabng pump pulley
Loosen mounting bracket to water pump screws,
and pry water pump away from engine to increase
belt tension Whle maintalnEng pressure on water
pump, retighten top and bottom screws. Recheck
belt tension.
Drive Belt. With the engine off, check the drive belt
deflecbon midway H between the water pump puIley
and the tensioner pulley.
Loosen the tensioner bracket screws and pry
tensioner away from the engine to increase belt
tension While maintaining pressure on the
tensroner, ret~ghten the bracket screws. Recheck
belt tension
Checking the cooling system. The temperature
gauge for the coolant should show between 148--
160°F / 64--71°C (sea water cooled), 160--185°F
.tl--85°0 (closed cooled) This is the normal cool-
ant temperature when the engine Is warm If the
coohng water temperature is abnormal, the cooling
system must be examined immedJately
Excesswe temperature may be due to a clogged wa-
ter retake, defective impeller in the sea water pump,
blockage in the engine’s cooling water channels,
clogged reverse gear Olt cooler, engine Oll cooler on
7 4/8 2 models, faulty thermostat or inaccurate
gauge. Low water temperature Js usually caused by
a faulty thermostat or the gauge reading IS incorrect
Operation in areas where seaweed, sea grass, sand
etc or other foreign matter might cause restricted
coohng water flow or damage to the water pump Im-
peller requires the use of properly installed sea wa-
ter filter or strainer In these areas a frequent main-
tenanoe of the filter is needed
4. Check the coolant level (closed cooled mod-
els)
,~
WARNING! Closed fresh water system rs un-
der pressure If pressure cap is removed
when engine is at operating temperature, turn
cap to first stop and allow pressure to escape
before completely removing cap
Remove pressure cap and fill the engine coolant
system until the coolant level reaches the lower
edge of the filler pipe FIil with anti-freeze mixture to
the correct level Top up using only 50/50 m~x of wa-
ter and antJ-freeze. Do not exceed this mixture ratio
NOTE! A~ways use anti-freeze even if there is no
risk of low temperatures. The anbqreeze ensures
the cooling system corrosion protection and runmng
w~th fresh water only can result In severe corrosion
damage to the component parts of the cooling sys-
tem Drain, flush and replace the coolant every other
season
11
7788827 - Ladattu osoitteesta www.volvopenta.com 17.11.2010 12:21:31
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