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Mazda 2.2L \  Pressurized radiator hoses?

Pressurized radiator hoses?

Mazda 2.2L Mazda Engine Mazda Tech
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replies 10
following 4
 
crypticcourier   +1y
Hello every one. i just bought a 1992 b2200 in damn good condition for dirt. Its one of the backyard stored specials. Sat for about 3 years. after idling for about ten mins i noticed the radiator was dripping water out from the radiator cap and the hoses where getting pressurized and the engine was getting hot. Bought the truck anyways thinking the thermostat was bad or the radiator was bad or clogged. Flushed the radiator 2 times replaced the thermostat and still the same problem. To get the truck home, i had to take the thermostat out completely. So heres what the problem that i see. The new thermostat is not opening causing the hoses to pressurize. what causes this? please tell me its not a head gasket.
gilligansdingy   +1y
im guessing head gasket too.
crypticcourier   +1y
The engine has good power, I dont have water in the oil, oil in the water, smoke, nothing. Could i get away with retorqueing the head? The guy said the engine was recently rebuild. maybe the mechanic didnt retoruqe the head after rebuilding it? Are there any signs of a rebuild engine?
dat dood   +1y
Does the problem persist after removing the t-stat? If so, you're pressurizing the coolant system by some means. If not, you're still getting trash in the t-stat causing it to stick. Also, radiator could be partially clogged causing a bottle-neck and resulting in build up of pressure at feed hose. Isolate, isolate, isolate. If the radiator is full and you pull the hoses it should be empty in just a few secs. The feed hose from the engine should also move A LOT of water while the engine is running. Also, change your radiator cap, it should vent pressure at a certain psi. If it's not it could cause pressure to build.

Just because you're not mixing oil and water doesn't mean the head gasket is good/properly torqued.

Samurai's are notorious for the gasket blowing between #3 and #4 cylinders causing tons of blow by and smoke.

My B2200 that I'm driving now has a bad head gasket, it's causing me to loose about a quart of oil per oil change. It leaks out just below the #4 exhaust port. No smoke, no oil/water mixing, just a leak where the oil return at the back of the head is.
crypticcourier   +1y
if i remove the t stat it works fine. no pressurization.
dat dood   +1y
Sounds like you need to flush the piss out of it. Use a strainer under the petcock, see what you catch.
crypticcourier   +1y
Hah ill try that tomorrow. Thanks for the input.
90-b22dawg [andrew]   +1y
flush kits are a waste of money. take the radiator and have it rodded out, or replace it.
crypticcourier   +1y
figured out the problem. T stat was upside down not letting air through the little hole. and the temp sender sensor was bad reading hot.
90-b22dawg [andrew]   +1y
glad you figured it out.....