Wednesday, 2 April 2014

Aprilia RS 125 how to test a thermostat and coolant cooling system / overheating problems RS125




Easy to do just dip it in hot water .

if it opens it good , you could even use a thermostat to test heat of

water and determine the exact temperature

it opens at , if your so inclined .

if it opens its good enough for me .

if not buy a new or used thermostat here on Ebay UK 




You can also test the temperature sensor fitted to the cylinder

 head 



Aprilia RS 125 how to test a thermostat and coolant cooling system / overheating problems RS125

Test between the connection at the top of sensor and
 
the earth of the threads , do this in hot water and it should decrease i

n the resistance ohms value as the sensor gets hotter.






The system uses water/antifreeze mix to cool the engine and carry

excess heat to the radiator .

the cylinder and cylinder is surrounded but a jacket of water the

crankshaft driver water pump flows water through

the circuit  and cooled via the radiator .



Components in the system   

Overflow and coolant bottle
 
radiator hoses 

radiator 

water pump 

temperature sensor 

filler cap ( spring loaded )  

thermostat 






possible overheating causes 

Coolant level low 

coolant bottle lid spring defective

leak in system preventing pressurization

faulty thermostat

water pump defective

clogged damage fins on radiator 
  
there are also other causes for example engine not running

correctly or set up incorrect , excessive loads and oil failure or low.


                                                                                                                                        









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