Z001019/0_6_July 2008 Page COOLING SYSTEM - 11
SERVICE MANUAL MARINE ENGINES
05 COOLING SYSTEM
00.06 ill.1
05.00.06 Component Checks of Engine Cooling System
1 Hoses and clamps, drain plug etc.
For all models: no special tool required.
Control works:
Check all external components of cooling system for leakage, wear and damages. Check all
connections for tightness. Check hoses for cracks, breaks or wear.
Repair works:
Repair or exchange
Water-supply hoses must be in accordance with SAE 20R3 specifications, class D-2.
2 Thermostat
No special tools required.
Control works:
As a standard, an 80° C thermostat is used for the
marine engine. Check thermostat for correct
model and correct rated output, corrosion, limited
mobility or broken spring.
Repair works:
No repair possible. Exchange thermostat.
Test procedure:
Dip the thermostat together with a thermometer into a water tank and heat up the water.
At a temperature of 80-81° C the thermostat should begin to open, and should open for 3,8-4,0 mm
at a temperature of 85-88° C (ill.1/A). At 90-93°C the thermostat should be open for 7 mm in order
to lock the little cooling circuit (contact-channel), thus permitting a complete flow through the heat
exchanger. Off 95 °C, the complete thermostat stroke of 8.0-8,2 mm is achieved.
3 Water pump (coolant circulating pump)
No special tools required.
Control works:
If with running engine leakage on the pump is stated, the slide-ring sealing at the front of the pump
is leaky.
Repair works:
Not provided; exchange pump.
ToC
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