normspanners
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can you spill time it then, ie does the fuel stop running at some point as the engine is turned meaning the port is covered, because that is the point of injection.
- Thread starter AndyStobbs
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AndyStobbs
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Theoretically yes, if I left the delivery valve out and put it back together, but as it wont pump any fuel at all then I wont have anything to watch for.
normspanners
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when you spill time though you pressure the pump with lift pump delivery pressure and turn the engine and watch for fuel to stop, usually from a swan neck tube ie old injector pipe cut off
and bent, when it stops the very last drip that is the point of injection.
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normspanners
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You probably know this but ;
generally idea on spill timing obviously superimpose number 2 cyl rather than 1!! just to prove you are reaching point of injection
(Remove the rocker cover to verify that both valves on number one cylinder are closed) 2. Remove the pump drive inspection cover from the timing case cover. . . 3. Remove number one fuel injection pipe then remove the clamp and unscrew the delivery valve holder from number one element, remove the delivery valve, valve spring and volume reducer and refit the delivery valve holder. Connect the test pipe to the delivery valve holder. 4. Set the stop control lever in the ‘Run’ position and the throttle lever in the maximum position. 5. Operate the fuel lift pump to prime the fuel system, fuel should now flow from the test pipe. 6. Turn the injection pump slowly in the direction of normal rotation (Clock-wise). As the element inlet port is progressively closed by the rising plunger, the fuel issuing from the test pipe will gradually diminish, the instant of inlet port closure will be observed when there is no drip of fuel from the test pipe for a period of 15 sec's. (The term ‘inlet port closure’ refers to the instant when the flow of fuel through the barrel inlet port from the fuel gallery is cut off by the pumping plunger on its upward stroke, and corresponds to the theoretical commencement of injection)
this should prove that at that point, the spill point, any fuel in the inj barrel HAS to go up into the pipe and be injected or is leaking back into the gallery of the pump and as long as the injector is not leaking back out the leakoff !!
generally idea on spill timing obviously superimpose number 2 cyl rather than 1!! just to prove you are reaching point of injection
(Remove the rocker cover to verify that both valves on number one cylinder are closed) 2. Remove the pump drive inspection cover from the timing case cover. . . 3. Remove number one fuel injection pipe then remove the clamp and unscrew the delivery valve holder from number one element, remove the delivery valve, valve spring and volume reducer and refit the delivery valve holder. Connect the test pipe to the delivery valve holder. 4. Set the stop control lever in the ‘Run’ position and the throttle lever in the maximum position. 5. Operate the fuel lift pump to prime the fuel system, fuel should now flow from the test pipe. 6. Turn the injection pump slowly in the direction of normal rotation (Clock-wise). As the element inlet port is progressively closed by the rising plunger, the fuel issuing from the test pipe will gradually diminish, the instant of inlet port closure will be observed when there is no drip of fuel from the test pipe for a period of 15 sec's. (The term ‘inlet port closure’ refers to the instant when the flow of fuel through the barrel inlet port from the fuel gallery is cut off by the pumping plunger on its upward stroke, and corresponds to the theoretical commencement of injection)
this should prove that at that point, the spill point, any fuel in the inj barrel HAS to go up into the pipe and be injected or is leaking back into the gallery of the pump and as long as the injector is not leaking back out the leakoff !!
