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  2. Toyota R engine - Wikipedia

    en.wikipedia.org/wiki/Toyota_R_engine

    Toyota swapped the dual-row timing chain used in older engines for a single-row chain with plastic guides in 1983. The new system reduced drag on the engine but introduced a new maintenance problem. After about 100,000 miles (160,000 km) of operation, the chain may stretch to the point that the hydraulic-operated chain tensioner cannot take up ...

  3. Timing belt (camshaft) - Wikipedia

    en.wikipedia.org/wiki/Timing_belt_(camshaft)

    The crankshaft drives the camshaft (via a timing belt, timing chain or gears), which in turn actuates the intake and exhaust valves. [1] These valves allow the engine to inhale air (or an air/fuel mixture) and exhale the exhaust gasses. [2] The most common devices to transfer the drive are toothed rubber belts, metal timing chains or a set of ...

  4. BMW N47 - Wikipedia

    en.wikipedia.org/wiki/BMW_N47

    Timing chain failure may call for engine replacement or a costly repair. The most seriously affected units which require the most extensive repairs were produced from 01.03.2007 to 05.01.2009. [ 4 ] However, there have been reports of timing chain failure in BMW diesel engines manufactured until 2015.

  5. Chrysler 3.3 & 3.8 engines - Wikipedia

    en.wikipedia.org/wiki/Chrysler_3.3_&_3.8_engines

    The 3.3 has a timing chain, and is an interference engine meaning that the valves will collide with the pistons in the event of a timing chain failure. Vehicles using the 3.3 include: 1990–1993 Dodge Dynasty, Chrysler New Yorker, Chrysler Imperial, (replaced the 3.0 L Mitsubishi 6G72 engine) 1990–2010 Chrysler minivans

  6. Variable valve timing - Wikipedia

    en.wikipedia.org/wiki/Variable_valve_timing

    Variable valve timing (VVT) is the process of altering the timing of a valve lift event in an internal combustion engine, and is often used to improve performance, fuel economy or emissions. It is increasingly being used in combination with variable valve lift systems.

  7. Belt (mechanical) - Wikipedia

    en.wikipedia.org/wiki/Belt_(mechanical)

    Camshafts of automobiles, miniature timing systems, and stepper motors often utilize these belts. Timing belts need the least tension of all belts and are among the most efficient. They can bear up to 200 hp (150 kW) at speeds of 16,000 ft/min (4,900 m/min). Timing belts with a helical offset tooth design are available.