Suzuki DF2.5 Service Manual page 195

INSPECTION
For all markets
If salt deposits, corrosion, wear or other damage is found, clean
or replace the thermostat.
Thermostat operation
Check the thermostat operating temperature as follows.
1. Insert a length of thread between the thermostat valve/body
and suspend the thermostat in a container filled with water.
2. Place the thermometer in the container and heat water.
Observe water temperature when the thermostat valve
opens and releases the thread.
Thermostat operating temperature:
Standard: 48 – 52 °C (118 – 126 °F)
If the thermostat valve does not open as specified above, or
sticks in any position, replace it.
INSTALLATION
Installation is reverse order of removal with the special attention
to the following steps.
For all markets except for US market
See the DF2.5 Service Manual, page 6-38.
For US market
1. Install the thermostat 1.
2. Apply sealant to both surfaces of thermostat cover gasket
(as shown with hatched lines).
93691-80030: SUZUKI SILICONE SEAL (100 g)
DF2.5 (Serial No. 410001 and later) 13
Thermometer
Heater
Thermostat cover gasket
Thermostat