['Air Programs']
['Air Emissions']
07/09/2024
...
(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 §1065.110.
(2) See §1065.125 for more information related to intake-air cooling.
(3) See §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 §1065.530(a)(1).
(c) Lubricating oil. Use lubricating oils specified in §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 §1065.745.
[70 FR 40516, July 13, 2005, as amended at 73 FR 37293, June 30, 2008]
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