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Compared to the progressive control of a gate valve a ball valve style petcock’s is coarse, confining their use principally to on-off applications.

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The procedure is described in the novel Das Boot and shown in the film version. John Deere tractors and stationary autozone application pdf download units produced from the late s to the early s had compression aktozone petcocks on the engine block, one per cylinder.

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Opening one with the engine running would result in a long blue-white flame if the cylinder was firing correctly. July Learn how and when to remove this template message.

Historically, petcocks were used on gravity feed fuel systems found on automobiles.

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These were opened during starting to de-pressurize the cylinders when paplication the flywheel by hand. The most common application of a petcock in an automobile is as a drain plug [1] for a radiator.

Spplication needing additional references from July All articles needing additional references All articles with unsourced statements Articles autozoone unsourced statements from February With universal adoption of fuel pumps they have all but disappeared in that application.

A petcock is a small shut-off valve used to control the flow of liquid or gas. Historically, petcocks were threaded valves controlled by a butterfly handle; [ citation needed ] modern petcocks are typically ball valves. Most older motorcycles autozone application pdf download a three-position fuel petcock valve known as a “petrol tap” in the Aytozone mounted on or nearby the fuel tank to control the supply of gasoline: Many older motorcycles lacked a fuel gauge, making reliance on a fuel autozone application pdf download a relatively common experience.

Retrieved from ” https: The reserve position accesses the bottom portion of the fuel tank.

Please help improve this article by adding citations to reliable sources. Petcocks may be used in vehicle heating and cooling systems, such as limousines and tractor trailers. The large MAN autozone application pdf download diesel engines used on German U-boats had petcocks that enabled the engineers to verify combustion in each cylinder.

Once the engine started they were closed and the engine would begin running smoothly. This article needs additional citations for verification.

Autozone application pdf download now have autoozne automatic, vacuum operated petcock that autozone application pdf download include a prime position which bypasses vacuum operation and allows fuel to flow to the carburetor without the engine turning over. Some historic examples of gravity feed systems include the Porsche and early Volkswagenswhich have a petcock with off, on, and reserve positions, much like a motorcycle petcock. Motorcycle technology Engine fuel system technology.