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
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.
let the engine overheat, this will cause serious warping and could damage
bearings if the oil gets too thin from the heat.
Sep 20, 2008 |
1994 Honda Civic