Page COOLING SYSTEM - 10 Z001019/0_6_July 2008
SERVICE MANUAL MARINE ENGINES
05 COOLING SYSTEM
05.00.05 Component Check Raw Water 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 tightness
of all connections. Check hoses for cracks, breaks or wear. Water-supply hoses must be in
accordance with SAE 20R3 specifications, class D-2.
Repair works:
Repair or exchange, as required.
2 Manifold, heat exchanger and intercooler:
No special tools required.
Control works:
Check components for leakage, in a pressure test. Disassembly and check for corrosion and
material residues.
Repair works:
Remove residues of foreign material from pipes. If there are signs of spongy spots between water
ducts and exhaust channel, the component is to be exchanged. Also check exchangeable
elements for damages. For assembly, use new sealings and sealing rings.
3 Raw water pump
No special tools required.
Control works:
With running engine, check rotation of pump belt pulley. If belt pulley runs out of true, this may
cause excessive wear of the pulley and damages on the pump itself.
If with running engine leakages on the pump are stated, the shaft sealing ring at the front of the pump
is leaky or the spacer is defective.
Repair works:
Not provided; exchange pump.
4 Fuel- and oil cooler
No special tools required.
Control works:
Check components for internal leakage, in a pressure test. If possible, dismantle and check for
corrosion and residues of foreign material.
Repair works:
Remove residues of foreign material. If possible, exchange inserts or replace components.
5 Water pump in stern-drive
No special tools required.
Control works:
Check water sucking filter at lower gear box for clogging. Check for sufficient water supply - as per
section Cooling System - Error Detection.
Repair works:
Dismantle water pump and repair or exchange defective components. For assembly, take care of
respective sealing of water pump. See notes and instructions of manufacturer.
ToC
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