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Sulzur pump

1. A plain plunger reciprocates in a barrel. 
2. As the plunger moves up and down, two pivoted levers operate push rods which open the suction and spill valves. 
3. When the cam follower is on the base circle of the cam, the suction valve is open and the spill valve is closed. 
4. As the plunger moves up the barrel, the suction push rod moves downwards and the suction valve closes.
5. Injection then commences and fuel is delivered via a non-return valve to the injectors.
6. As the plunger continues upwards so the spill push rod will open the spill valve, the pressure above the plunger will fall and injection will cease.
7. The quantity of fuel delivered can be controlled by altering the position of the eccentric pivot for the spill valve operating lever. This will cause the spill valve to open earlier or later.
8. By altering the position of the suction valve pivot, the start of injection can be similarly controlled, and therefore it can be seen that the pump utilizes VIT.

Checking timing 

• 1. 1. Turn engine to ahead direction, pump plunger at TDC
     2. Fit dial gauge to suction, set to zero 
     3. Turn engine in astern until pump roller at cam base 
     4. Fit gauge to plunger and spill, set to 0 
     5. Turn engine ahead until suction reads 0.02 mm 
     6. At the point suction valve is closing, fuel delivery start
     7. Note crankangle degree, plunger dial 
     8. Turn ahead until spill read 0.02 mm 
     9. Indicate spill valve opening, fuel delivery stop
     10. Effective stroke (b-a)

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