Guys I have an issue with my standard 240Z and I've had it for at least a year.
It builds pressure in the cooling system and my first thought was the head gasket. Remember the thread last year posted by Mike B about bleeding the system and I said that it was too dangerous with the rad cap off, well that's because with my car it is.
If I run it with a thermostat in it will blow water out of the rad overflow when the 'stat opens. If I run it without a 'stat it's much better but it still builds pressure. So you might think that the gasket has blown but it will retain pressure for weeks! So if the gasket had gone wouldn't the pressure leak away?
Compressions are good at about 165psi and no water in the oil. Car drives well and goes as fast as I'd expect a good standard 240Z to go (quite quick).
I know I should take the head off but this engine has never been apart and I'm reluctant to do that and also I might break manifold studs etc.
Any ideas?
It builds pressure in the cooling system and my first thought was the head gasket. Remember the thread last year posted by Mike B about bleeding the system and I said that it was too dangerous with the rad cap off, well that's because with my car it is.
If I run it with a thermostat in it will blow water out of the rad overflow when the 'stat opens. If I run it without a 'stat it's much better but it still builds pressure. So you might think that the gasket has blown but it will retain pressure for weeks! So if the gasket had gone wouldn't the pressure leak away?
Compressions are good at about 165psi and no water in the oil. Car drives well and goes as fast as I'd expect a good standard 240Z to go (quite quick).
I know I should take the head off but this engine has never been apart and I'm reluctant to do that and also I might break manifold studs etc.
Any ideas?