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coolant doesn't even boil until 230 that shouldn't harm the engine, the piston on mine that seized looks as though its a lack of oil anyways which should be unrelated. I'm calling Quebec tomorrow to argue with them, if they don't cover it I'm going to hopefully have a job by summer and rebuild it then and trade it in for a cat
Pistons are fit to the cylinders so the clearance is optimum at the intended operating temperature. If the temperature gets too high the aluminum pistons grow too much and get too tight in the cylinders and get scuffed in milder overheating instances and seize with more severe overheating. They will seize even if there isn't a basic oiling issue.
Once there is not enough clearance between the piston and cylinder wall there is not enough room for sufficient oil and the higher friction also creates additional heat which adds to the issue. Technically the seizure is from insufficient oil, but it’s a problem brought on by excessive temperature rather than am oiling system malfunction.
The coolant may not be boiling, but that doesn't mean the pistons cannot not seize if they get tight in the cylinder.
If the pistons are fit loose so they won't seize even when overheated then they run loose at the standard operating temperature and that's not good either as ring life and power suffer, among other issues.
The bottom line is engines are engineered to run within a certain temperature range, and if the operating temperature is too low or too high problems will result.
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