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No, its not common. Usually only after over-heating badly. If it was cracked it would be building pressure in the header tank. It is possible that you may have a head gasket going, What reading did you get from the 2 middle cylinders? Unlightly, the gasket is gone between the two cylinders but...

i would say its prob ok , still no harm to do a compression test, it will show any wear in your engine that will give you that back pressure up the filler cap or dipstick , test is simple u just need a petrol compression tester ,loan or buy one they not dear,removing the plugs will be the...

no there shouldn`t be a lot of pressure , small bit ok , sounds like back pressure , best thing is do a compression test that will sort all,also check breather pipe`s not blocked too

Hello I think you might have an early stage of a head gasket if at all , not a cracked cyl head , did the engine over heat badly as in gone beyond steaming , is the oil level over the full mark and all grey in colour,or just blotches at top of dipstick which could mean car does a lot of cold...

Hello to all I am new to all this so i`ll do my best I`m working on an 01 A3 petrol that firstly had the temp needle going from normal to over heating and back again ,i changed all 3 temp sensors , 2 on thermostat housing and 1 on the radiator,even though it seem to help it didn,t cure the...