Section 09 COOLING SYSTEM
Subsection 01 (CIRCUIT, COMPONENTS AND CARE)
Removal
Remove the coolant pump housing from the PTO
cover. Refer to COOLANT PUMP HOUSING RE-
MOVAL elsewhere in this section.
NOTE: The thermostat is located inside the
coolant pump housing.
Leak Test
Plug the connections of the oil cooler return hose,
coolant tank hose, ride plate return hose and cylin-
derheadreturnhosewitharag.
1
F18E12A
3
2
4
1. Oil cooler return connection
2. Coolant tank hose connection
3. Ride plate return hose connection
4. Cylinder head return hose connection
Fill the coolant pump housing with water.
If a bigger quantity of coolant leaks out at the ride
plate outlet connection, replace the coolant pump
housing. Refer to COOLANT PUMP HOUSING in
this section.
If there is no leak, check the operation of the ther-
mostat.
Dynamic Test
To check the operation of the thermostat, put it
in water and heat water. Look inside the cylin-
derheadreturnhoseconnectiontoseethemove-
ment of the thermostat. Thermostat should open
when water temperature reaches 87°C(188°F).
If there is no operation, replace coolant pump
housing and thermostat.
Installation
For installation, reverse the removal procedure,
paying attention to the following details.
Refer to COOLANT PUMP HOUSING REPLACE-
MENT in this section.
COOLANT PUMP IMPELLER
Removal
Remove:
– coolant pump housing no. 6
– unscrew the impeller no. 8 clockwise.
1
F18E13A
1. Impeller
CAUTION: Coolant/oil pump shaft no. 9 and im-
peller no. 8 have left-hand threads. Remove by
turning clockwise and install by turning coun-
terclockwise.
Inspection
Check impeller for cracks or other damage. Re-
place impeller if damaged.
Installation
The installation is the opposite of the removal pro-
cedure. Pay attention to the following details.
CAUTION: Be careful not to damage impeller
wings during installation.
Torque impeller to 3 N•m(26lbf•in).
ROTARY SEAL
Inspection
Check weep hole for oil or coolant leak.
494 smr2004-Complete Line Up
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