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 | Sealing the Deal for Maximum Compression -
Understanding why a relatively inexpensive head gasket costs so much to
replace means first realizing what it sits between. In the engine block are
pistons that travel up and down in cylinder bores. The pistons are connected
to rods, which in turn are connected to a spinning crankshaft from which the
vehicle takes its power. Bolted to the top of the engine is the cylinder head.
Inside the cylinder head are valves that open and close to let air and fuel
into the cylinders and expel the spent exhaust gas.
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The head gasket is compressed between the engine block and the cylinder head.
The head gasket seals in the internal combustion process and also keeps
coolant and oil from mixing together as the two fluids travel from the engine
block to the cylinder head. Head gaskets themselves are not very expensive.
What ends up costing big money is getting to it. Removing and replacing the
head gasket means undertaking the major operation of removing an engine's
head.
Boiling Over
A head gasket can fail for a number of reasons, none of them good. Engine
overheating is the most popular culprit. The metal of the engine block and
head expands beyond limits during overheating. This expansion can pinch the
head gasket to the point where it will fail. The next major causes of head
gasket failure are engine pre-ignition or detonation. The crux of these two
conditions is out-of-time combustion occurring in the cylinders. Internal
combustion is supposed to occur with both valves closed and with the piston at
the top of its power stroke. Out of time combustion puts extra strain on the
valves, pistons, and head gasket. Ironically, engine overheating can also
increase the likelihood of pre-ignition and detonation. The sound of an engine
pinging or knocking is the insidious sound of damage.
Head Surgery
Head gasket replacement is not a job for the average do-it-yourselfer. While a
head gasket expiring due to old age is rare, it usually means everything else
is worn out to the point of replacement as well. Cracking the head off the
engine and peering inside may reveal that everything else got fully cooked,
too. The best way to prevent head gasket failure is to keep the cooling system
in top working order and make sure the engine is in tune and running
correctly. The failure of a $5 thermostat or $3 coolant hose can cause
thousands of dollars in engine damage in a hurry. The following are a few
general tips for replacing a head gasket. For vehicle specific head gasket
replacement procedures always consult a service manual.
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