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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.
List of FMCSA standards for motor vehicles Archived 2013-03-28 at the Wayback Machine "Timeline of Federal Motor Vehicle Safety Standards by Year and Notable Technologies" (PDF). National Highway Traffic Safety Administration. 2012. Archived from the original (PDF) on 2021-06-24
The Federal Motor Carrier Safety Administration (FMCSA) is an agency in the United States Department of Transportation that regulates the trucking industry in the United States. The primary mission of the FMCSA is to reduce crashes, injuries, and fatalities involving large trucks and buses.
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.
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 ...
Motor carrier's disposition of Form MCS 63: Motor carriers shall carefully examine Forms MCS 63 and all violations or mechanical defects noted thereon shall be corrected. To the extent drivers are shown not to be in compliance with the Federal Motor Carrier Safety Regulations, appropriate corrective action shall be taken by the motor carrier.
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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.