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Depends on what exactly you mean by "header tank". If that is the same as I mean by "expansion tank", then your setup sounds all wrong (backwards). The idea is to trap the air in the tank and return only liquid to the system. Your setup sounds like it traps the water and returns air.
I may be misunderstanding the setup you have.
Did you note the 'factoid' I mentioned? That's the key. The water pressure at the rear housing is higher than ANY point in the external plumbing. Any trapped air in the block tends to collect at and then get forced out (not in) at this point.
Tracy
On Wed, Sep 9, 2009 at 9:41 PM, <SHIPCHIEF@aol.com> wrote:
Kevin, Tracy, All;
I'm using that top Fwd fitting for cooling my Turbo bearing housing, then to the water pump inlet. I couldn't use the original Mazda supply because I used a Lamar lower intake casting, and I frankly couldn't figure out how Mazda did it.
I'm a bit concerned about the route of the vent from the top of the water pump. I don't use a thermostat, I have the 1/2 NPT plug in the thermostat well. I vent the top of the Thermostat cover (water neck). I run it to the top of the head tank (-6). I run a line from the bottom of the head tank to the water pump inlet. So the water pump inlet has the radiator return hose, the turbo cooling hose (-6) and the Water head tank bottom hose (-6). Water flows thru the head tank
I take the water pressure reading from a tee on the vent to the head tank.
Am I doing this wrong?
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