Thermostat; Rotary Seal - SeaDoo Rotax 1503 4-Tec 2005 Engine Shop Manual

CAUTION: Be careful not to damage impeller
wings during installation.
Torque impeller to 3 N•m (26 lbf•in).

THERMOSTAT

The thermostat is a single action type.
Removal
Remove the coolant pump from the PTO cover.
Refer to COOLANT PUMP above 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-
der head return hose with a rag.
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.
Refer to COOLANT PUMP in this section.
If there is no leak, check the operation of the ther-
mostat.
smr2005-088
Section 01 ENGINES (1503 4-TEC)
Dynamic Test
To check the operation of the thermostat, put it
in water and heat water. Look inside the cylin-
der head return hose connection to see the move-
ment of the thermostat. Thermostat should open
when water temperature reaches 87°C (188°F).
If there is no operation, replace the coolant pump.
Installation
For installation, reverse the removal procedure,
paying attention to the following details.
Refer to COOLANT PUMP in this section.

ROTARY SEAL

Inspection
Check weep hole for oil or coolant leak.
1. Weep hole
Coolant leaking out of the hole indicates a defec-
tive rotary seal. Leaking oil indicates a faulty oil
seal.
However, if seal is disassembled both parts have
to be replaced together.
Removal
Remove:
– coolant pump no. 6
CAUTION: Always unscrew the impeller clock-
wise otherwise you can damage the compo-
nents.
– unscrew the impeller no. 8 clockwise
– remove PTO cover no. 10 (refer to PTO HOUS-
ING/MAGNETO section)
– remove screws no. 11 retaining oil pump cover
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Subsection 05 (COOLING SYSTEM)
65