Auto Engine Compression Tests - By: Terry S Vostor

An engine compression test enables you to determine the condition of the internal parts, how well the valves and pistons are sealing and the sealing of the "combustion chamber" or chambers. Unless engine-compression readings are within the automobile maker's specifications engine performance cannot be or seldom be improved with an auto tuneup.

A compression test can be very useful in pinpointing bad valves, worn piston rings / cylinders and / or leaky head gaskets. A vacuum test can help you spot vacuum leaks in the intake manifold ( or in older vintage automobiles and vehicles - the carburetor). Next in line the " compression test" may help your neighborhood garage mechanic or technician at your local auto dealership service department spot overall low readings & levels of motor compression, leaky head gaskets, late ignition timing, a restricted or partially impeded or plugged exhaust system, sticky valves, burned or damaged valves , or lastly even "worn" valve guides.

In the case of diesel engines - such as VW diesel motor, the Volkswagen diesel develops much higher compression than a gasoline engine variety setup. The typical gas engine will run satisfactorily with cranking compression as low 90 psi whereas the VW Diesel should withstand pressures in the ranges of 400 to 500 pounds per square inch to raise the temperatures high enough to ignite diesel fuel to power up the engine. On top of that not a lot of complexity or of engine & motor damage are incurred or involved. Many motorists use the seasonal changes as a reminder to make other checks. Always note and remember that these are simply "guidelines". If for instance, your car begins to show symptoms of needing a tuneup in the middle of August, you should not wait until late fall to do the work.

Weekly checks
With the car stationary and engine cold check the following weekly
1)engine oil level
2)battery fluid level
3)radiator coolant level
4)windshield water reservoir
5)power steering reservoir fluid
6)tire pressures
7)tires for cuts and tire wear patterns
8)brake pedal action
9)fan bolts and cooling system hoses ? In the case of VW diesel engines its an entirely different manner than standard gasoline powered engine powerplants. Conventional compression gauges with their 250 to 300 psi limit will not do. VW supplies a model that not only reads 600 lbs per sq inch, but provides a roll of paper and an automatic marking pen ( in place of standard indicator needle) to provide a permanent record of compression readings. Of course in the new millennium electronic versions are available at your local Canadian tire outlet store. Car oil varies from four quarts to seven. The owner's manual and markings on the dipstick will inform you how much oil that your auto requires and needs. The thickness of an oil ( also called or referred to as its viscosity). The standard procedure by the society of Auto Engineers (SAE), is to number the oils according to viscosities. Generally the higher the number , the thicker the oil. All numbers are preceded by the letters SAE, the abbreviation for the accepted professional and trade society that sets "the standard" employed. If the number is followed by the letter "W" , the thickness was measured at zero degrees (0), if no letter follows then it was done at 210 degrees F. It can be generally held & diagnosed that if the condition of waste oil smoke is not accompanied by any unusual engine noises or overall loss of power , that the most likely cause is worn valve guides.

No doubt about it. In today's modern world of 2010 , most people are dependent on their vehicle - Before removing the spark plugs check your battery's voltage. Next check the engine oil to insure proper engine lubrication. Start the engine, allowing it to reach proper and normal operating temperatures, then turn off the ignition switch. Then remove the air-cleaner assembly. Mark the vacuum hoses attached to the air cleaner with masking or duct tape using your own code to replace them properly before disconnecting them. Take care of your auto & will serve you reliably & in good stead.

About the Author

Terry S. Vostor Winnipeg One Hour Furnasman My Autoleader Western Canada Auto Financing

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