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Old 07-02-2016
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passenger side cylinder head gasket failure

well it happened to my engine wednesday night on the drive home

i keep a religious eye on the temp gauge at all times .

and boom the gauge drops down to halfway between cold and normal operating temperature

AH !! CRAP!! so i quickly pull over and shut the engine down and walk across the street to a

hotel to grab some sleep and have the mazda towed to the dealership in the morning

waiting on word from the mechanic about my extended warranty coverage
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Old 07-03-2016
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???

temp gauge dropped down

How or why would you concluded head gasket issue from that?
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Old 07-03-2016
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experienced the very same problem with another vehicles engine many years ago

1 of the cylinders with a failed head gasket port was pumping air into the engines cooling system

the easy way to tell is to connect a cooling system pressure tester and let the engine warm up and watch the tester .

the pressure tester needle went to full pressure on the needle gauge

some where around 30 psi if i remember correctly

we also had a cylinder compression tester to the suspected cylinder

the other 3 cylinders held pressure , but #2 kept fluctutating

sure enough , #2 cylinder was pressurizing the cooling system , but no coolant was leaking out or into the engine oil

we tested cooling system pressure with a radiator cap that was defective and would not open at any pressure in the radiator
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Old 07-03-2016
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Yes, all of that is fine, but why would the temp gauge go down if air was being pumped into the cooling system?

It should go up
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Old 07-03-2016
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weird isnt it

turns out that that the coolant temperature sender requires a solid mass under pressure to properly send coolant temperature reading

water --- solid mass , cannot be mass compressed

air -- not a solid mass , can be mass compressed

several years later a machinist friend of mine and i came up with a easier and less damaging way of testing for a failed head gasket

he simply machined a piece of steel with 1 end threaded with a spark plugs correct threads and then drilled out the stock .

he then machined off the threads of a air chuck adapter and welded the adapter to the piece he machined

simply screw the adapter into 1 cylinder at a time connect a pressure controlled air hose , and watch the cooling system tester for gauge movement
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