---
kind: "section"
citation: "40 C.F.R. § 1065.122"
title: "40"
number: "1065.122"
heading: "Engine cooling and lubrication."
url: "https://uscodex.org/cfr/40/1065.122"
---

# §1065.122. Engine cooling and lubrication.

- (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](/cfr/40/1065.110.md).
  - (2) See [§ 1065.125](/cfr/40/1065.125.md) for more information related to intake-air cooling.
  - (3) See [§ 1065.127](/cfr/40/1065.127.md) 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)](/cfr/40/1065.530.md?p=a-1).
- (c) **Lubricating oil.** Use lubricating oils specified in [§ 1065.740](/cfr/40/1065.740.md). 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](/cfr/40/1065.745.md).

## Notes

### Amendments

[70 FR 40516, July 13, 2005, as amended at 73 FR 37293, June 30, 2008]

### Authority

Authority: 42 U.S.C. 7401-7671q.

### Source

Source: 70 FR 40516, July 13, 2005, unless otherwise noted.

### Amendments

[70 FR 40516, July 13, 2005, as amended at 73 FR 37293, June 30, 2008]