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Hello my name is Steve Smith and I work for Pico Technology
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We are looking at the WPS transducer connected to diesel injector back leakage
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By no means does this replace the bottle test but is in addition to
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The beauty of this is we can actually go on a road test
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Assuming we have got the drain and the spill set up correctly and securely
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So we will no switch on the WPS
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It is important to have the pressure sensing tap open to atmosphere
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Because at this point we are running through a calibration
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So we are setting the zero to atmospheric pressure in every scale
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Now because we are measuring spill
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We are going to measuring spill or back leakage through the measurement port
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Through the measurement chamber
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And it is important we don't offer a restriction here
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So we must have a flow through and straight back out
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So how we do this
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Is by using a cable tie
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That way we can keep the bleed or drain tap open
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To demonstrate
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Tap is closed
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Tap is now open
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So any pressure we apply to here
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Back leakage will drain straight through into our spill bottle
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Connection wise we are connected to number 4 injector
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So it is at the end of the injector rail
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Connected into our pressure port
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We have the pressure bleed tap open
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So diesel back leakage can pass through the WPS
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Through the measuring chamber
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And straight out through the spill into the collection bottle
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We have a breakout lead connected to injector 1 measuring current
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So now we can monitor the spill from each injector
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The pressure in the spill in the back leakage from each injector
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Whilst monitoring the signal from number 1 injector
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It is important to note that when we start the vehicle
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If we can hold the WPS pressure transducer upside down momentarily
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We can bleed any air that is trapped within the pressure port
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Through the measurement chamber and out through the drain port
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Now start the engine
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Engine revs
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Engine stops