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  2. GMC straight-6 engine - Wikipedia

    en.wikipedia.org/wiki/GMC_Straight-6_engine

    The Group 1 engines were the smallest in displacement and outer dimensions, and differed most significantly from the larger Group 2 and Group 3 engines by having only four main bearings (whereas the Group 2 and 3 engines had seven) [1]: 15 and a different firing order (1-5-3-6-2-4, whereas the others are 1-4-2-6-3-5).

  3. List of GM transmissions - Wikipedia

    en.wikipedia.org/wiki/List_of_GM_transmissions

    Muncie SM465 — 4-speed longitudinal manual used in 68- 91 Chevy 1/2 3/4 and 1 ton trucks; New Venture Gear NV1500 — 5-speed longitudinal manual made by New Venture Gear; New Venture Gear 3500/4500 — 5-speed longitudinal manual made by New Venture Gear

  4. Valve actuator - Wikipedia

    en.wikipedia.org/wiki/Valve_actuator

    Electric actuator (blue cylinder) on a valve in a power plant. A black handwheel is visible on the actuator, which allows manual positioning of the valve. The blue valve body is visible in-line with the pipe. The valve actuator opens or closes the butterfly disc of the valve based on electrical signals sent to the actuator.

  5. Chevrolet G506 - Wikipedia

    en.wikipedia.org/wiki/Chevrolet_G506

    Their official model numbers were initially the "G4100", and later the "G7100" series. [4] They became standard 1 + 1 ⁄ 2-ton 4x4 trucks for the US Army and Army Air Corps during World War II. [4] During World War II, the US military purchased a total of 167,373 four by four 1 1 ⁄ 2-ton trucks, and Chevrolet supplied the great majority of them.

  6. Thermal expansion valve - Wikipedia

    en.wikipedia.org/wiki/Thermal_expansion_valve

    A thermal expansion valve is a key element to a heat pump; this is the cycle that makes air conditioning, or air cooling, possible. A basic refrigeration cycle consists of four major elements: a compressor, a condenser, a metering device and an evaporator. As a refrigerant passes through a circuit containing these four elements, air ...

  7. Chevrolet C/K - Wikipedia

    en.wikipedia.org/wiki/Chevrolet_C/K

    While the Action Line would not undergo a definitive model revision through its production, the series underwent gradual changes on a biannual basis. [1] The drivetrain line underwent multiple revisions, as a large-block V8 was offered for the first time in 1968. After 1969, GM switched entirely to Chevrolet-produced engines for C/K pickup trucks.

  8. Chevrolet/GMC B series - Wikipedia

    en.wikipedia.org/wiki/Chevrolet/GMC_B_series

    The division offered its conventional school bus chassis with Chevrolet-produced engines, including the 250 inline-6 (replaced by the 292 inline-6), 366 V8, and 427 V8. [1] In both Chevrolet and GMC school buses, the Allison AT475 3-speed automatic transmission became an option in 1971 with single or two-speed rear axles.

  9. HVAC control system - Wikipedia

    en.wikipedia.org/wiki/HVAC_control_system

    HVAC (Heating, Ventilation and Air Conditioning) equipment needs a control system to regulate the operation of a heating and/or air conditioning system. [1] Usually a sensing device is used to compare the actual state (e.g. temperature) with a target state. Then the control system draws a conclusion what action has to be taken (e.g. start the ...

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