Document ID: chunk:federal_register_of_legislation:F2024L00443:reg:3:p5
Version: federal_register_of_legislation:F2024L00443
Segment Type: reg
Provision Reference: reg 3 (pt 5/13)
Character Range: 223538–226311

Within ten minutes of completion of the preconditioning, the engine shall be switched off.
              4.2.7. If requested by the manufacturer and approved by the Technical service, additional preconditioning may in exceptional cases be allowed. The Technical service may also choose to conduct additional preconditioning. The additional preconditioning consists of one or more driving schedules of the Part One cycle as described in Table A4a/1 and Figure A4a/1 of Annex 4a to the 07 series of amendments to this Regulation. The extent of such additional preconditioning shall be recorded in the test report.
              4.3. Soak methods
              4.3.1. One of the following two methods, to be selected by the manufacturer, shall be utilised to stabilise the vehicle before the emission test.
              4.3.2. Standard method
               The vehicle is stored for not less than 12 hours nor for more than 36 hours prior to the low ambient temperature exhaust emission test. The ambient temperature (dry bulb) during this period shall be maintained at an average temperature of:
               266 K (-7 °C) 3 K during each hour of this period and shall not be less than 260 K (-13 °C) nor more than 272 K (-1 °C). In addition, the temperature may not fall below 263 K (-10 °C) nor more than 269 K (-4 °C) for more than three consecutive minutes.
              4.3.3. Forced method
               The vehicle shall be stored for not more than 36 hours prior to the low ambient temperature exhaust emission test.
              4.3.3.1. The vehicle shall not be stored at ambient temperatures which exceed 303 K (30 °C) during this period.
              4.3.3.2. Vehicle cooling may be accomplished by force-cooling the vehicle to the test temperature. If cooling is augmented by fans, the fans shall be placed in a vertical position so that the maximum cooling of the drive train and engine is achieved and not primarily the sump. Fans shall not be placed under the vehicle.
              4.3.3.3. The ambient temperature need only be stringently controlled after the vehicle has been cooled to 266 K (-7 °C)  2 K, as determined by a representative bulk oil temperature.
               A representative bulk oil temperature is the temperature of the oil measured near the middle of the oil sump, not at the surface or at the bottom of the oil sump. If two or more diverse locations in the oil are monitored, they shall all meet the temperature requirements.
              4.3.3.4. The vehicle shall be stored for at least one hour after is has been cooled to 266 K (-7 °C)  2 K, prior to the low ambient temperature exhaust emission test. The ambient temperature (dry bulb) during this period shall average 266 K (-7 °C)  3 K, and shall not be less than