Question about 1994 Honda Civic

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Pressure low. continue with my pressure low problem.mechanic says my car block gasket burned out.he knew because he check my water tank. first he open my water tank then start my car and then look at the water, some small bubble continues flows up at my water idle also goes up and it gasket burn?i got 1 time temperature go up nearly at red line.then i stop my car and then add water without waiting for my engine it the block easy curved?mechanic says hondas block easy curved because its made by aluminium.

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You can recheck what the mechanic found, looking for the bubbles and sniffing at the opening of your coolant reservoir; if it smells like fuel or exhaust, he is probably right about the failed gasket.
The head gasket is a busy thing; it has to keep water out of the oil, oil out of the water, fuel and exhaust gases out of both systems.
If the gasket fails from a cylinder only into the water jacket, it will leak hot combustion gases into the cooling system and the cooling system can't cope with it therefore the overheating.
When the engine cools down, it can **** water into a cylinder and cause misfires and even make your sparkplugs rusty.
If the head gasket fails between oil and coolant channels, the oil will turn into hand lotion (and not lubricate well) and the coolant will be visibly oily.
Aluminum blocks and heads properly designed won't warp much worse than cast iron and any of them should be carefully checked for warp before reassembly. A few thousandths of an inch is OK since the head gasket can tolerate some imperfections in the fit.
When reassembling, applying the prescribed amount of torque (quite a bit) deforms the gasket and it will take up small deviations from perfectly flat.
The head is the most sensitive since it has less bulk but also the easiest to correct, unless the degree of warp is so bad that enough material to correct the warp cannot be removed any more.
Any service manual will contain the maximum amount of 'milling' that can be done without worrying about the pistons hitting the valves or underside of the head.   
Don’t let the engine overheat, this will cause serious warping and could damage bearings if the oil gets too thin from the heat. 

Posted on Oct 10, 2008


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Check the radiator cap. If it doesn't hold pressure of about 13-15 psi in the coolant system, the seal is bad and a new radiator cap is called for. The coolant system is a sealed system, so you should never have to add coolant, save for a small loss through evaporation in the overflow tank. If you are losing coolant, there must be a leak that needs found and repaired-a pressure test of the system should show up a leak.
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Doesn't sound like it ran hot enough or long enough to crack or warp the head. If there is a crack, the engine will continue to overheat. If a warped head, car would probably run rough, the affected cylinders would likely have little or no compression, there would be a noticeable miss, and overheating would continue.
Why the low coolant? It's a sealed system, so should never have to add coolant, other than a small loss from evaporation in the overflow tank. Monitor the level closely for the next few days. Note the level in the overflow tank to see if it drops over time. Leaks can be external anywhere in the coolant system-engine, radiator, hoses, heater core- or internal in the engine-head gasket failures can cause coolant in the cylinders (white smoke out the exhaust), or coolant in the oil (oil will have a milky brown look to it), or oil in the coolant (will see traces of oil in the radiator).
A couple of tests may be called for. A pressure test of the coolant system will check if the system holds pressure as it should-about 15 psi. If pressure does not hold, there is a leak somewhere. Water pumps usually leak through the weep hole when they fail. A radiator leak would show up when pressure is applied. If pressure does hold, check if you have a good radiator cap-the cap is what seals the system so pressure will maintain. Coolant under pressure raises it's boiling point by about 10 degrees, so is critical to keep the system under pressure.
If you suspect further problems-losing coolant or continued overheating-then have the chemical test done to check for exhaust gasses in the coolant. Basically a check if the head gasket is good, a simple test done at the radiator cap opening with a special fluid that changes color if hydrocarbons are present in the cooling system.
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The cooling system: water pump, thermostat, radiator, hoses, heater core and hoses, radiator cap, overflow tank, and the cooling fans and associated wiring. Make sure everything is working right and you'll be good to go.

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