Thermostat - Volvo Penta TD520GE Workshop Manual

Repairing components

Thermostat

(26273)
Thermostat, checking
1. Push the thermostat down, then turn it and take it
out of the thermostat housing.
2. Test the thermostat function and replace if
necessary.
3. Push the thermostat down into the thermostat
housing and turn it.
NOTE! The securing yoke must engage with the
thermostat housing.
Thermostat, function check
1. Measure the measurement "a" on the thermostat.
"a"= the thermostat starts to open ............... 83°C
"b"= the thermostat is completely open ....... 93°C
2. Heaten the thermostat in a water bath.
NOTE! To get the exact opening temperature,
measure as close to the thermostat as possible
without touching it. Stir the water unceasingly to get
an even temperature distribution. The temperature
should not rise more than 1°C/min, or the time of
opening is delayed.
3. Measure the measurement "b" on the thermostat.
When the thermostat is completely open, 95°C,
the difference between "a" and "b" should be at
least 8 mm.
"a"-"b"= min 8 mm.
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