Hi, there...a couple questions? A) should I assume my thermostat is finished if the centre pin pulls free of the thermostat and remains in the housing, as per the photos? B) How can you check a thermostat of this type, because presumably it requires the housing to press against, not having the ‘metal frame’ around it? C) How does it work...surely the spring expands when the temperature increases, but this would surely be opposite to the desired effect. (PS for those interested in the head and valve progress...I will update those threads once the head is off. The stripped head bolt is dealt with, just waiting for my Snap On bits to deal with the other 7 )
I’m not familiar with that style of thermostat Stuart but I’m wondering if the pin is just to centrally locate it in the housing? Does the pin come out? It does look a bit “used” and if it was me I’d change it if I had any doubts about it. I’m sure you probably think the same. Well done on getting the troublesome bolt out, I hope the other 7 play ball for you.
Thanks for the insights Yorkshireman. No I can’t pull the pin out (haven’t used pliers at this stage though because of scoring). I am thinking down the line of replacement, but would love to check it out first if it’s possible to do that outside of the housing? Can’t wait to share the bolt removal (though it’s still in torque sequence with the others at this stage) once these Torx bits arrive. Yes, fingers crossed for the other 7
Does anyone know if I should at least see something moving when brought to the boil, even with it being outside the housing? Namely should the charge cylinder still push out the ‘inner cylinder,’ even though it doesn’t have the the metal ‘shroud’ around it to push against?
Found it! The Triumph thermostat test! Thanks Sprinter...found it after watching your link on YouTube.
Having said that...upon second watching, the thermostat has behaved the reverse of what I was expecting...it looks as though this action would actually CLOSE the flow, NOT open it?
