Question about 1994 Honda Civic
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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Posted on Jan 02, 2017
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