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Deutz Ecke
Deutz / Deutz-Fahr Schlepper
DX-Serie
F6L912 Injection-pump TIMING
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<blockquote data-quote="bad sector" data-source="post: 640175" data-attributes="member: 36732"><p>I received the hand-pump today and made an M14 banjo adapter for it. I think I have all I need to do this timing. In review the procedure should then resemble this:</p><p></p><p></p><p>Back off (CW from rear) about 90 degrees from compression TDC.</p><p></p><p>Begin turning the engine in normal direction of rotation (CCW from rear) to return to that compression TDC.</p><p></p><p>Normally the low-pressure feed pump would now be filling the cyl-1 injection plunger and nothing would flow out the injection pipe going to cyl-1. </p><p></p><p>But the hand-pump high pressure overrides the cyl-1 injection element relief and so fuel flows into the pump element AND also out the cyl-1 injection pipe. </p><p></p><p>Observing this flow tells us that in this sector of rotation the plunger is filling up. </p><p></p><p>Reaching the CoD point the fuel inlet that the hand-pump feeds is shut closed, and hand-pump fuel in no longer admitted through it i.e. the observed flow stops.</p><p></p><p>Now the already filled up cyl-1 injection plunger begins to compress the fuel it already holds (a few drops which it would normally send out as a squirt at very high pressure) but turning the engine slowly this will mean a total of some drops forming and falling away.</p><p></p><p>As the previous flow stops and the first one of these few drop BEGINS to form on the u-pipe open end, THAT is the marker for the beginning of delivery or CoD (Commencement of Delivery) point. </p><p></p><p>One could say that this point is half-way between the total cessation of flow and the beginning of the first drop but nailing that down would be impossible so it is the beginning of the actual formation of the first drop that is used for timing. </p><p></p><p>This point should be reached at 31 degrees before compression TDC.</p><p></p><p>I think it's very important to itemise action-and-observation steps because right from the beginning it is the validation of these that gives one confidence in the procedure.</p></blockquote><p></p>
[QUOTE="bad sector, post: 640175, member: 36732"] I received the hand-pump today and made an M14 banjo adapter for it. I think I have all I need to do this timing. In review the procedure should then resemble this: Back off (CW from rear) about 90 degrees from compression TDC. Begin turning the engine in normal direction of rotation (CCW from rear) to return to that compression TDC. Normally the low-pressure feed pump would now be filling the cyl-1 injection plunger and nothing would flow out the injection pipe going to cyl-1. But the hand-pump high pressure overrides the cyl-1 injection element relief and so fuel flows into the pump element AND also out the cyl-1 injection pipe. Observing this flow tells us that in this sector of rotation the plunger is filling up. Reaching the CoD point the fuel inlet that the hand-pump feeds is shut closed, and hand-pump fuel in no longer admitted through it i.e. the observed flow stops. Now the already filled up cyl-1 injection plunger begins to compress the fuel it already holds (a few drops which it would normally send out as a squirt at very high pressure) but turning the engine slowly this will mean a total of some drops forming and falling away. As the previous flow stops and the first one of these few drop BEGINS to form on the u-pipe open end, THAT is the marker for the beginning of delivery or CoD (Commencement of Delivery) point. One could say that this point is half-way between the total cessation of flow and the beginning of the first drop but nailing that down would be impossible so it is the beginning of the actual formation of the first drop that is used for timing. This point should be reached at 31 degrees before compression TDC. I think it's very important to itemise action-and-observation steps because right from the beginning it is the validation of these that gives one confidence in the procedure. [/QUOTE]
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Deutz Ecke
Deutz / Deutz-Fahr Schlepper
DX-Serie
F6L912 Injection-pump TIMING
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