(a) Engine cooling. Cool the engine during testing so its intake-air, oil, coolant, block, and head temperatures are within their expected ranges for normal operation. You may use auxiliary coolers and fans.
(1) For air-cooled engines only, if you use auxiliary fans you must account for work input to the fan(s) according to Sec. 1065.110.
(2) See Sec. 1065.125 for more information related to intake-air cooling.
(3) See Sec. 1065.127 for more information related to exhaust gas recirculation cooling.
(4) Measure temperatures at the manufacturer-specified locations. If the manufacturer does not specify temperature measurement locations, then use good engineering judgment to monitor intake-air, oil, coolant, block, and head temperatures to ensure that they are in their expected ranges for normal operation.
(b) Forced cooldown. You may install a forced cooldown system for an engine and an exhaust aftertreatment device according to Sec. 1065.530(a)(1).
(c) Lubricating oil. Use lubricating oils specified in Sec. 1065.740. For two-stroke engines that involve a specified mixture of fuel and lubricating oil, mix the lubricating oil with the fuel according to the manufacturer's specifications.
(d) Coolant. For liquid-cooled engines, use coolant as specified in Sec. 1065.745. [70 FR 40516, July 13, 2005, as amended at 73 FR 37293, June 30, 2008]