Engine Block Pistons

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Engine Block Pistons
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If you have ever had your vehicle's head gasket (HG) replaced, you know that it's an expensive repair job. However, you might be surprised to learn the component itself is relatively inexpensive. In order to understand why replacing it is so costly, it's worth exploring how it sits in your engine.

Your engine block has several pistons that rise and fall within their respective combustion chambers. Each one is attached to a rod that attaches to the crankshaft. As the pistons rise and fall, the rods turn the crankshaft, which ultimately turns your car's wheels (that's a gross oversimplification). On top of the engine block sits your car's cylinder head. This component includes the intake and exhaust valves that let the air-fuel mixture in and the exhaust out.

The head gasket is positioned between your vehicle's cylinder head and engine block. If it fails, removing it requires a lot of time and effort. And that's why the repair job is so expensive. Below, we'll take a quick look at the reasons this part fails.

An Overheating Engine

This is the most common problem. If your engine overheats, the heat can cause the cylinder head and engine block to expand. As they do, they literally crush and thereby, destroy - the head gasket. Once this happens, it cannot properly seal the combustion chambers. As a result, the air-fuel blend cannot be properly compressed before ignition. That dramatically reduces the performance of your engine. What's more, the problem will only get worse with time.

When your engine overheats and crushes the head gasket, you need to find the reason behind the overheating. It may be due to a coolant leak, malfunctioning cooling fan, or an issue with your radiator. If you don't fix the root cause, a new HG will suffer the same fate as the one it replaces.

Pre-Ignition Or Detonation

If a hot spot forms within a combustion chamber, it can ignite the air-fuel blend prior the spark plug firing. This problem is called pre-ignition. Not only will it damage the corresponding piston over time, but it can lead to head gasket failure.

Detonation is another serious problem. This happens when the air-fuel mixture ignites outside the cylinder's normal rhythm. It usually happens as the result of excess heat or compression that has built up within the combustion chamber. It can lead to spark knock. Spark knock will not only damage your pistons, but like pre-ignition, can eventually destroy your head gasket.

Even though this component is relatively small and appears as if it's easy to replace, it's not. While you may be able to do it yourself, you're better off relying upon a mechanic for the job. Also, keep in mind that a trained mechanic can diagnose why your engine has overheated, or why pre-ignition or detonation is occurring. And that means you can prevent the component from failing in the future.

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Know The Basics Of The Car Engine Parts

The car engine is certainly the main part that determines the usefulness of a car. No matter how luxurious a car you have bought, unless you have the right engine, you will not be satisfied with its performance.

However, to ensure that you have purchased the right engine, you have to understand the basic features of the car engines. You have to understand the basic parts of the car engine. This will help you understand the way they function and at the same time, you will be able to identify the right engine for your car.

Well, one of the most important parts of an engine is the cylinder. There are different types of cylinders in a car engine and they work differently. This is why different manufacturers use different types of cylinders that make their cars suitable to a specific type of terrain. So, before you choose the right car, you have to ensure that the number of cylinders as well as the pattern of them is suitable for that. This is one very crucial factor that decides the performance of a car.

The next important part of an engine is the valve. This is also a very important part since it controls the fuel and air that will be released to the piston chamber. This is countered by the exhaust valve that releases the burnt fuel from the piston chamber. Eventually, this is released through the tail pipe.

Now, we have the piston of the engine to consider. Basically, this is the power device in your car engine. The combustion stroke forces it down while the flywheel and crankshaft bring it up with the momentum of the exhaust stroke. Actually, the flywheel is designed as a varying weight on crankshaft and it stores the momentum. The crankshaft keeps on rotating and it receives the movement from the stroke of the piston. Thus, the crankshaft becomes the initial drive line of the car.

Because of so many mechanisms going on, the car engines produce a lot of heat. This is why the cooling systems are necessary to keep it working for a long time. For that, the antifreeze is stored in the radiator to cool down the block of your Car engine parts. This is done by the radiator fan. This antifreeze is basically, a constantly moving path of hoses and compartment to cool the engine block.

However, for an engine to start, it needs a spark. This is provided y the starter system that generates the spark to light the fuel air mix compressed in the piston. This system is run by battery and it also lends movement to the crankshaft. The lubrication system in the engine makes sure that all these parts are moving smoothly and without damaging frictions.

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Now, any of these parts within an engine can cause problems. So, if you want to replace the part of a Car engines, you need to visit engines2u.co.uk. This website has a huge stock of all the parts of a car engine.

Here is what my volkswagen engine block and pistons look like! Do you think that I need to get a new engine?

http://i13.photobucket.com/albums/a284/Uwillfallhard/Car1.jpg
http://i13.photobucket.com/albums/a284/Uwillfallhard/Car3.jpg
http://i13.photobucket.com/albums/a284/Uwillfallhard/Car6.jpg
http://i13.photobucket.com/albums/a284/Uwillfallhard/Car7.jpg
http://i13.photobucket.com/albums/a284/Uwillfallhard/Car8.jpg
Basically the car has 102 thousand miles. The timing belt broke and all 20 valves had interfarence and the pistons have valve slap marks as deep as a credit card. The head was sent off and rebuild...did pressure test and everything was fine when the valves were replaced. I haven't check the rings and crank yet...too scared to check for stress fractures and to see if the bearings are good. I just dont know to fix and trade in or rebuild the rest of the motor and keep it.

Well it looks likes like your timing belt snapped. Because it looks like your valves hit your piston. Is this off a turbo or a n/a (naturally aspirated) engine? Looks like a 2.0 to me. As long as your engine didn't overheat for some reason your bottom end should be ok. VW lower engine internal parts and blocks are very strong. as for your head i think your going to have to at least replace the valves that hit the piston from the marks they left on the piston its possible that your valves bent try turning the camshaft if any valve doesn't fully close its bent. Just replace any bent valves and put the motor back together with new gaskets, timing belt with tensioner. Hope this helps good luck.

* i just looked back at your previous questions. I guess i was wrong about it being a 2.0 no problem the 1.8t are just as strong, if not stronger (forged pistons). Like i said the valve job should take care of your problem just replace the valves that hit, they will be the only ones that are bent. I strongly suggest that you replace the water pump and thermostat while you're in there. I have done a few of these jobs before you don't need a new engine, its easyer for the dealer to replace a whole motor than to re-valve a head but costs more, If your car was still under the factory warranty Volkswagen of America wont pay the dealership to replace a whole motor just because a timing belt snapped its more cost effective to do a valve job than to replace a engine that will cost them thousands more.* Hope this helps. Good Luck.

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