§ 393.83 Exhaust systems.
发布02-19
生效03-23
摘要总结AI 辅助解读
该法规（49 CFR § 393.83）规定了美国商用车辆排气系统的安全标准。核心要求包括：排气不得朝向油箱或燃油加注口下方；卡车及牵引车排气须位于驾驶室后方；禁止使用缠绕物或补丁进行临时修复；排气系统必须牢固固定且不得在驾驶员/卧铺舱前方或正下方泄漏。违反这些规定将导致车辆被判定为不安全，面临路边检查（Roadside Inspection）中的缺陷记录甚至停运风险。
- (a) Every motor vehicle having a device (other than as part of its cargo) capable of expelling harmful combustion fumes shall have a system to direct the discharge of such fumes. No part shall be located where its location would likely result in burning, charring, or damaging the electrical wiring, the fuel supply, or any combustible part of the motor vehicle.
- (b) No exhaust system shall discharge to the atmosphere at a location immediately below the fuel tank or the fuel tank filler pipe.
- (c) The exhaust system of a bus powered by a gasoline engine shall discharge to the atmosphere at or within 6 inches forward of the rearmost part of the bus.
- (d) The exhaust system of a bus using fuels other than gasoline shall discharge to the atmosphere either:
- (1) At or within 15 inches forward of the rearmost part of the vehicle; or
- (2) To the rear of all doors or windows designed to be open, except windows designed to be opened solely as emergency exits.
- (e) The exhaust system of every truck and truck tractor shall discharge to the atmosphere at a location to the rear of the cab or, if the exhaust projects above the cab, at a location near the rear of the cab.
- (f) No part of the exhaust system shall be temporarily repaired with wrap or patches.
- (g) No part of the exhaust system shall leak or discharge at a point forward of or directly below the driver/sleeper compartment. The exhaust outlet may discharge above the cab/sleeper roofline.
- (h) The exhaust system must be securely fastened to the vehicle.
- (i) Exhaust systems may use hangers which permit required movement due to expansion and contraction caused by heat of the exhaust and relative motion between engine and chassis of a vehicle.
[53 FR 49401, Dec. 7, 1988]