6B-32 - CLOSED COOLING MODELS 90-823225--1 1096
10. After seawater section of cooling system has
been drained completely, coat threads of drain
plugs with Quicksilver Perfect Seal and reinstall.
Tighten drain plugs securely. Reconnect hoses
and tighten all hose clamps securely. If NOT
equipped with seacock: seawater inlet hose
must remain disconnected and plugged until en-
gine is to be restarted.
Filling Closed Cooling
Section
NOTICE
See “Specifications” for approximate
closed cooling system capacity and
coolant recommendation.
!
WARNING
Do not remove coolant cap when engine is hot.
Coolant may discharge violently.
!
CAUTION
Alcohol or Methanol based antifreeze or plain
water are not recommended for use in fresh wa-
ter section of cooling system at any time.
!
CAUTION
Front of engine should be higher than rear to
purge trapped air out of the system during initial
filling. This will minimize the possibility of air be-
ing trapped in the closed cooling section which
can cause engine to overheat.
1. Remove coolant cap on heat exchanger.
2. Fill closed cooling system with coolant mixture
through heat exchanger fill neck until coolant
level is 1 in. (.25 mm) below filler neck.
!
CAUTION
Avoid seawater pickup pump impeller damage
and subsequent overheating damage to stern
drive unit. DO NOT operate engine without water
being supplied to seawater pickup pump.
!
CAUTION
Models with belt drive seawater pickup pump
must be in the water when running engine be-
cause garden hose will not supply enough water
to system at higher RPM.
3. With pressure cap off, start engine and run at fast
idle (1500-1800 RPM). Add coolant solution to
heat exchanger, as required, to maintain coolant
level 1 in. (25 mm) below filler neck.
4. After engine has reached normal operating tem-
perature (thermostat is fully open), and coolant
level remains constant, fill heat exchanger to bot-
tom of filler neck.
5. Observe engine temperature gauge to make
sure that engine operating temperature is nor-
mal. If gauge indicates excessive temperature,
stop engine immediately and examine for cause.
6. Install pressure cap on heat exchanger.
7. Remove cap from coolant recovery reservoir and
fill to FULL mark with coolant solution. Reinstall
cap.
8. With engine still running, check hose connection,
fittings and gaskets for leaks.
IMPORTANT: Engine overheating is often due to
air being trapped in closed cooling section.
Purge air by running engine at 2000 RPM for 10
minutes.
!
WARNING
Allow engine to cool before removing pressure
cap. Sudden loss of pressure could cause hot
coolant to boil and discharge violently. After en-
gine has cooled, turn cap 1/4 turn to allow any
pressure to escape slowly, then push down and
turn cap all the way off.
9. Recheck coolant level after first open-throttle
boat test and add coolant, if necessary.
10. Maintain coolant level in coolant recovery reser-
voir between ADD and FULL marks with engine
at normal operating temperature.
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