Cooling System - Westerbeke W70GA Service Manual

COOLING SYSTEM
COOLING TROUBLESHOOTING
COOLANT LEAKAGE:
CORROSION
OVERHEATING
WATER
PUMP
DISASSEMBLY
Failed Heat Exchanger
Leakage from coolant hoses or
heater hoses
Leakage from water temperature
switch
Malfunction of water seal (water
pump)
Damaged or loose thermostat
cover or gasket
Loose cylinder head bolt
Damaged cylinder head gasket
Cracked cylinder block
Impurities in coolant
Water passage clogged
Thermostat malfunction
Blockage in heat exchanger
Water pump malfunction
ln$uffici~rit coolant
Radiator cap malfunction
1. Remove the water pump from the engine as a unit by
removing the belts.
2.
With the pump on a bench, use a bearing puller as
shown 'to remove the pulley.
3.
Set the pulley on a support block and press the impeller
off using a press and
an
iron rod between the press and
the shaft.
4. Press the shaft and bearing assembly off using the
press with the iron rod set between the assembly and
the press.
~
_.--PIPE
SEAL
5. Use a pipe to remove the water seal.
INSPECTION
• Inspect the pump pulley and replace it with a new one if
there 'is any damage to the timing belt grooves.
• Check the water pump body for cranking.
• Check the shaft/bearing it should rotate easily without
any abnormal noise.
• Inspect for wear in areas where the impeller contacts the
seal. Replace the seal if needed.
ASSEMBLY
REPLACE WITH A
NEWO-RING
1. Install the water seal by tappmg as shown above.
NOTE: Make certain the seal is not cracked. Take care iwt
to damage the seal.
2. Coat the seal with coolant.
NOTE: Replace the shaft and bearing as as assembly.
3. Use a press
~o
push the shaft and bearing assembly into
place. Press with the pipe on the outer race of the
bearing. After assembly, make certain the bearing turns
smoothly.
PRESS _
__,,_i
4.
Push the pump
pull~y
into place using a press.
5.
Press the impeller in so that it is flush with the end of
the shaft.
Engines & Seneratars
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