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missend

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    Some files about Renault Nissan key prog 2-in-1 Free Download

    in General Nissan Owners Lounge

    Posted

    Some files about Renault Nissan key prog 2-in-1 Free Download

     

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    You totally don't need to worried about the download attachments, which have not  attacking virus,they are safe to your cumputer. If the anti-virus software show that our attachment (especially .exe .zip .rar) containing virus,just relax, please uninstall or close anti-virus software before you download these files, else these .exe .zip files will not gonna work any more before you run them, if that happen you can contact with our customer service to resend you the software. 

    Head Gasket Replacement

    in Nissan Knowledgebase (Submit your tip to the KB)

    Posted

    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.
     

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