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A dustcap is a small cover used on the valve stem of a bicycle or car tire to prevent dust or other small particles from entering the valve and damaging it. Dustcaps are usually made from plastic but may occasionally be made of metal. The dustcap is internally threaded and is secured by screwing it onto the end of the stem.
The Professional Truck Driver Institute (PTDI) is a non-profit organization that provides certification of training courses for drivers of commercial motor vehicles.It was formed in 1986 during the standardization of commercial driver's licensing by the Federal Motor Carrier Safety Administration in the United States. [1]
The field organizations deliver program services to FMCSA partners and customers. This organization consists of Field Operations, Service center and State-level motor carrier division offices. These offices answer questions and provide guidance concerning the Federal Motor Carrier Safety Regulations. List of FMCSA Service Centers
The audit activity and the resultant motor carrier safety rating has been criticized for being imperfect, and perhaps misleading. Studies [2] [3] have shown that for a considerable number of audit items, correlation coefficients between audit item outcome and actual safety performance have counter-intuitive signs: the better the compliance rating of firms, the worse their accident rates.
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Part 567: [104] Certification; Part 568: [105] Vehicles manufactured in two or more stages; Part 569: [106] Regrooved tires; Part 570: [107] Vehicle-In-Use inspection standards; Part 572: [108] Anthropomorphic test devices; Part 573: [109] Defect and noncompliance responsibility and reports; Part 574: [110] Tire identification and record keeping
The upper part of the valve stem, within the rocker box, is lubricated by oil. If this oil travels unchecked along the valve stem, engine HC emissions will become excessive. To control this, an elastomeric seal is fitted over the top of the valve guide. These may wear or stiffen with age, so are usually replaced whenever valves are removed for ...
A valve stem is a self-contained valve that opens to admit gas to a chamber (such as air to inflate a tire), [1] and is then automatically closed and kept sealed by the pressure in the chamber, or a spring, [2] [3] or both, to prevent the gas from escaping.