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Message: <blockquote data-quote="dkveuro" data-source="post: 5347" data-attributes="member: 757"><p>Tazza, to understand the injection timing point, is simply that the delivery plunger closes off the fuel injection barrel in the pump at the 22btdc mark and then starts to pressurize the fuel in the rack element barrel to begin injection............................................ If the i/p is an inline type, the following applies : To check injection timing, the line to #1 injector is removed and also the check element in the #1 pump delivery line holder. ( Use magnet, and observe how element check valve and spring assemble.) Place the throttle at WOT......................................... With some pressure in the i/p delivery system by the lift pump or other means, the fuel should stop welling up the #1 delivery hole just as the engine gets to 22btdc ( Your timing point.) on compression stroke. This is the point where the fuel is now trapped by the rack element plunger and no futher fuel can be pushed through and being as liquid is nearly incompressable, the injection sequence commences............................................ Black smoke = Over fueled.............................................. White smoke = Unburnt fuel, late i/p timing, engine cold, smoke should be minimal if all settings correct....................................................... This timing reference takes into concideration the ignition delay, actual start of combustion is most likely about 16 degrees or so btdc. FYFI... You can get a sensor that clamps to the delivery line and adaptor so you can set timing with a timing light.....of course you need to set timing on the type of engine first by the book, so you would know what the timing light would show............................. The other type is a Luminecent sensor that screws into the glow plug hole and does the same thing with the timing light...................................... This applies to all inline injection pumps, apart from the new generation of PD or electronic type. .</p></blockquote><p></p>

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