The Nissan Altima originally came with a 4-cylinder engine on the other hand began offering the Election of a V6 engine with the 2002 imitation. As these engines metamorphose older, parts inside wear away and the automobile runs poorly, burns oil or loses function. A compression assessment is a benevolent custom of diagnosing these problems, such as worn cylinder walls, piston rings and valves.
Instructions
1. Perspiring up the engine in the Nissan Altima prior to testing, in that running a compression examination on a boreal engine Testament cause inaccurate results. The battery should be in excellent shape thanks to it Testament want to spin the engine distinct times during the corroboration.
2. Disable the ignition method to avoid electrical shock during the inspection and remove the Glimmer plugs from the engine. Numbers should also fall within 10 PSI of each other. Retest any cylinders with low compression numbers.6. Add a small amount of motor oil to the cylinder before performing the compression test again.
Dwelling the compression tester in one of the Glimmer plug holes and crank the starter. This rotates the engine and builds compression on account of cylinder. Write down the resulting number. Continue testing each of the remaining cylinders in the same fashion, recording the compression numbers. When you finish, there will be either four or six compression numbers, one for each cylinder.
4. Compare the compression numbers to manufacturer specifications. A Nissan Altima with a V6 engine has a compression ratio of 10.3:1, but for one with a 4-cylinder engine, the ratio varies by model year. If the model year is 1993 through 1999, the ratio is 9.4:1. For 2000 and 2001, the ratio changes to 9.2:1, and the ratio for 2002 through 2007 is 9.5:1.
5. Evaluate the test results. Compression numbers should fall within 15 PSI of the recommended compression ratio. Provided the automobile contains a V6 engine, there will be six spark plugs, on the other hand whether it has a 4-cylinder engine, there Testament be lone four Glimmer plugs. Look the Glimmer plugs for oil or damage, by reason of these are signs of problems within that cylinder.3.
If the number increases, the cylinder contains worn piston rings or cylinder walls. If the number is unchanged, it has worn valves or valve seats.
