missend Posted February 25, 2013 Share Posted February 25, 2013 View moreCar diagnostic toolThe head gasket islocated between the engine's cylinder head and block. When a spark ignitesgasoline in the engine, the explosion creates pressure in the engine. The headgasket provides a seal that keeps that pressure contained within the engine'scylinder. The head gasket also provides a seal for internal engine water and oilpassages.If the engine is allowed to overheat, the cylinder head gasket may becomedamaged. Running the vehicle when its coolant is low or when there has been acooling system failure can cause overheating.Replacing the head gasket requires major engine dismantling. The coolingsystem is drained, and the intake and exhaust manifolds are removed. The timingcover, timing belt (or timing chain), and valve covers may also need to beremoved. In order to gain access to the bolts and hardware securing the cylinderhead to the engine block, the camshafts may need to be removed.After the cylinder head is removed, the cylinder head and engine blocksurfaces are cleaned and examined for damage. The head gasket is replaced andengine components reassembled.Mechanics' Corner: More Technical DetailHead gasket failure caused by severe or repeated engine overheating willnecessitate close inspection of the cylinder head itself for cracks, as well asmeasurements taken to assure that the cylinder head is not warped. A warpedcylinder 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 evennecessary. This is especially true if head gasket failure was severe orprolonged.About this Repair: Head Gasket(s) ReplacementBestPracticesTo prevent an expensive, recurring problem, the integrity of theentire cooling system should be inspected and tested when a head gasket isreplaced.During this repair, the cylinder head(s) will need to be inspected andmachined. Additional repairs may be needed after the inspection, which can addseveral hundred dollars to the repair and are not included in the RepairPalestimate.Cylinder head gasket replacement often occurs when the engine has highmileage; several additional parts may be needed during the repair. These mayinclude cooling system components (hoses, water pump, radiator, thermostat,etc.) vacuum lines, timing belt, ignition wires, and more. These will be inaddition to the RepairPal estimate above.Common Symptoms:Head gasket failures are often due to anoverheated 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 whenyou first start the vehicle, especially if it's been sitting overnight. Therough 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 thannormal. Quote Link to comment Share on other sites More sharing options...
missend Posted April 26, 2013 Author Share Posted April 26, 2013 hope it can help you Quote Link to comment Share on other sites More sharing options...
missend Posted May 28, 2013 Author Share Posted May 28, 2013 more auto diagnostic tools Quote Link to comment Share on other sites More sharing options...
Victor520 Posted June 5, 2013 Share Posted June 5, 2013 it is very good that i just looking forthx for your share Quote Link to comment Share on other sites More sharing options...
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