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Nissan Sentra Parts And Nissan Sentra Accessories

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Nissan Sentra Parts

Nissan Sentra Articles

  • Nissan Sentra: Blown Head Gasket Issue

    In 1982, Nissan introduced the Nissan Sentra.a compact car geared toward young families, single drivers, and budget-conscious the United States. The Nissan Sentra replaced the Datsun 210 in the automaker\'s lineup. It came when the automaker was in the process of creating a new name, from Nissan to Datsun. As a result, it was the first car with the Nissan badge. But just like any other Nissan vehicle, the Sentra, without proper maintenance, also becomes prone to various problems such as a blown head gasket. If you happen to own this vehicle and it has severely overheated and doesn\'t start or starts but overheats, then it\'s most likely that it\'s suffering from a blown head gasket issue. This is particularly true if the fan, thermostat, and water pump of your car are working. Now, here are some tips on what to do when this problem occurs.

    Diagnose the problem.

    There are three tests that can help you determine a blown head gasket, and these are the dye test, the engine compression test, and the cylinder leak-down test. In the dye test, which others refer to as \"block test\" or \"block check\" a tool is used to draw air from the cooling system through a dye or chemical that checks if carbon monoxide is present. Presence of this gas indicates that there is crack in the cylinder head or the head gasket itself is already defective. The dye used starts off with a blue color, but if CO is present, it turns into yellow or green. However, make sure that the dye you will use is good and that the tester doesn\'t get contaminated with coolant. If coolant contaminates the tester, you will get a false reading. The compression test, on the other hand, is done using a compression gauge or tester. It provides a reading that tells whether the engine and its vital parts such as the valves, valve seats, and piston rings are still in good condition. However, unlike the dye test, this one only detects the most serious cases of head gasket leaks. Meanwhile, a cylinder leak-down test is actually a compression test, but it\'s done in reverse. It is a reliable test because it rarely overlooks a problem and lets you know which cylinder is leaking.

    Aside from these tests, another way that you can detect if your Nissan Sentra has a blown head gasket is to check the condition of the engine oil by pulling out the engine oil dipstick. If the color of the engine oil is like coffee with too much cream and your car starts and overheats or does not start, you have a blown head gasket. If the color of the engine oil is normal, that is a good sign but more testing is needed to rule out a blown head gasket. Inspect if the engine\'s compression or combustion gases are entering the cooling system. If the coolant bubbles out or shots out from the radiator, your Nissan Sentra has a blown head gasket.

    Replace the head gasket.

    When a head gasket is replaced, the integrity of the entire Nissan Sentra\'s cooling system should be inspected and tested. This is to prevent the problem from recurring. You may need to have the cylinder heads inspected and machined. After this inspection, additional repairs may be needed. Also, take note that additional parts may be required during the replacement of the cylinder head gasket such as cooling system components, vacuum lines, timing belt, ignition wires, and more.

    Use a head gasket sealer.

    The most common, albeit expensive, fix for a blown head gasket is replacing it. However, you have the option to seal a leaky head gasket with a head gasket sealer. You can pour this chemical additive directly into the radiator of your Nissan Sentra. Once inside the cooling system, the head gasket sealer will form a chemical weld in the leak of your head gasket due to the temperature differential.