Head Gasket Replacement

[missend]

View more
Car diagnostic tool

The head gasket is
located between the engine's cylinder head and block. When a spark ignites
gasoline in the engine, the explosion creates pressure in the engine. The head
gasket provides a seal that keeps that pressure contained within the engine's
cylinder. The head gasket also provides a seal for internal engine water and oil
passages.

If the engine is allowed to overheat, the cylinder head gasket may become
damaged. Running the vehicle when its coolant is low or when there has been a
cooling system failure can cause overheating.

Replacing the head gasket requires major engine dismantling. The cooling
system is drained, and the intake and exhaust manifolds are removed. The timing
cover, timing belt (or timing chain), and valve covers may also need to be
removed. In order to gain access to the bolts and hardware securing the cylinder
head to the engine block, the camshafts may need to be removed.

After the cylinder head is removed, the cylinder head and engine block
surfaces are cleaned and examined for damage. The head gasket is replaced and
engine components reassembled.

Mechanics' Corner:
More Technical Detail

Head gasket failure caused by severe or repeated engine overheating will
necessitate close inspection of the cylinder head itself for cracks, as well as
measurements taken to assure that the cylinder head is not warped. A warped
cylinder head can often be machined flat, but it may have to be replaced.

Due to the damaging effects of coolant entering the combustion chamber,
oxygen sensor and/or catalytic converter replacement may be prudent or even
necessary. This is especially true if head gasket failure was severe or
prolonged.

About this Repair:
Head Gasket(s) Replacement
Best
Practices
To prevent an expensive, recurring problem, the integrity of the
entire cooling system should be inspected and tested when a head gasket is
replaced.

During this repair, the cylinder head(s) will need to be inspected and
machined. Additional repairs may be needed after the inspection, which can add
several hundred dollars to the repair and are not included in the RepairPal
estimate.

Cylinder head gasket replacement often occurs when the engine has high
mileage; several additional parts may be needed during the repair. These may
include cooling system components (hoses, water pump, radiator, thermostat,
etc.) vacuum lines, timing belt, ignition wires, and more. These will be in
addition to the RepairPal estimate above.

Common Symptoms:
Head gasket failures are often due to an
overheated engine, but can also be caused by high mileage and/or age.

An early sign of a failing head gasket will be a rough running engine when
you first start the vehicle, especially if it's been sitting overnight. The
rough running will generally last for only a few seconds.

A leaking headgasket will often leak engine coolant into the oil, causing a
"chocolate milk" like appearance and the oil level my be higher than
normal.
 

[missend]

hope it can help you

[missend]

more auto diagnostic tools

[Victor520]

it is very good that i just looking for

thx for your share