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IEC 60068 is an international standard for the environmental testing of electrotechnical products that is published by the International Electrotechnical Commission (IEC).. IEC 60068 is a collection of methods [1] for environmental testing of electronic equipment and products to assess their ability to perform under environmental conditions including extreme cold and dry heat.
The YJ used a 2.5 L AMC 150 I4 or optional 4.2 L AMC 258 I6 until 1990. Power outputs at the time of introduction are 117 hp (87 kW) for the fuel injected four-cylinder, while the carburetted 'six only produces 112 hp (84 kW), albeit with more than fifty percent more torque than the smaller engine. [ 3 ]
Drive modes offered include 2-wheel high, part-time 4-wheel high, and part-time 4-wheel Low. All Dana 18 cases are cast iron and use the "Texas" bolt pattern with five bolts holding on the transfer case. There are five variations: 27-tooth drive gear, 3/4" intermediate shaft and 1.98:1 low range, 3 in (76 mm) input hole
Temperature cycling (or temperature cycle) is the process of cycling through two temperature extremes, typically at relatively high rates of change. It is an environmental stress test used in evaluating product reliability as well as in manufacturing to catch early-term, latent defects by inducing failure through thermal fatigue .
When in "4-Low" mode the front and rear axles are locked together and power is sent to all four-wheels through a 2.92:1 gear reduction in the power transfer unit; providing a crawl ratio of 56:1 for four cylinder Jeep Cherokees and a 47.8:1 crawl ratio for six-cylinder Cherokees. All Cherokees with this system have a raised ride height of one inch.
The 4.0 L is one of AMC's best-known engines. [30] It was one of four AMC engines kept in production when Chrysler bought AMC in 1987. Chrysler engineers continued to refine the engine to reduce noise, vibration, and harshness. The last in the line of the AMC inline sixes, the 4.0 L is regarded as one of the best Chrysler 4x4 off-road engines. [31]
Such tests are usually done isothermally (at constant temperature) by changing the atmosphere of the sample. First, the sample is brought to the desired test temperature under an inert atmosphere, usually nitrogen. Oxygen is then added to the system. Any oxidation that occurs is observed as a deviation in the baseline.
The gauge and cold junction are usually calibrated at room temperature, 72 °F (22 °C). Because the thermocouple is calibrated for room temperature, the gauge readings will only be 100% accurate at that engine compartment temperature. If the engine compartment temperature is colder, the CHT temperature will display higher.